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Overview
Comment: | Move the ISQLiteNativeModule interface to its own file. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
b233d0f72d7161611aba8f0c7b24308a |
User & Date: | mistachkin 2015-10-18 00:18:54.068 |
Context
2015-10-18
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01:51 | Fix typo. check-in: b64cf102ce user: mistachkin tags: trunk | |
00:20 | Work in progress on a tool to update the embedded doc comments for the ISQLiteNativeModule interface. check-in: 44c116ca23 user: mistachkin tags: vtabDocComments | |
00:18 | Move the ISQLiteNativeModule interface to its own file. check-in: b233d0f72d user: mistachkin tags: trunk | |
2015-10-17
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21:09 | Update the included core library documentation. check-in: b57c9d07fc user: mistachkin tags: trunk | |
Changes
Changes to Setup/data/verify.lst.
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526 527 528 529 530 531 532 533 534 535 536 537 538 539 | System.Data.SQLite.url System.Data.SQLite/ System.Data.SQLite/AssemblyInfo.cs System.Data.SQLite/AssemblySourceIdAttribute.cs System.Data.SQLite/AssemblySourceTimeStampAttribute.cs System.Data.SQLite/Configurations/ System.Data.SQLite/Configurations/System.Data.SQLite.dll.config System.Data.SQLite/LINQ/ System.Data.SQLite/LINQ/SQLiteConnection_Linq.cs System.Data.SQLite/LINQ/SQLiteFactory_Linq.cs System.Data.SQLite/Resources/ System.Data.SQLite/Resources/DataTypes.xml System.Data.SQLite/Resources/MetaDataCollections.xml System.Data.SQLite/Resources/SQLiteCommand.bmp | > | 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 | System.Data.SQLite.url System.Data.SQLite/ System.Data.SQLite/AssemblyInfo.cs System.Data.SQLite/AssemblySourceIdAttribute.cs System.Data.SQLite/AssemblySourceTimeStampAttribute.cs System.Data.SQLite/Configurations/ System.Data.SQLite/Configurations/System.Data.SQLite.dll.config System.Data.SQLite/ISQLiteNativeModule.cs System.Data.SQLite/LINQ/ System.Data.SQLite/LINQ/SQLiteConnection_Linq.cs System.Data.SQLite/LINQ/SQLiteFactory_Linq.cs System.Data.SQLite/Resources/ System.Data.SQLite/Resources/DataTypes.xml System.Data.SQLite/Resources/MetaDataCollections.xml System.Data.SQLite/Resources/SQLiteCommand.bmp |
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Added System.Data.SQLite/ISQLiteNativeModule.cs.
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910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 | /******************************************************** * ADO.NET 2.0 Data Provider for SQLite Version 3.X * Written by Joe Mistachkin (joe@mistachkin.com) * * Released to the public domain, use at your own risk! ********************************************************/ namespace System.Data.SQLite { #region ISQLiteNativeModule Interface /// <summary> /// This interface represents a virtual table implementation written in /// native code. /// </summary> public interface ISQLiteNativeModule { /// <summary> /// <para> /// This method is called to create a new instance of a virtual table /// in response to a CREATE VIRTUAL TABLE statement. The db parameter /// is a pointer to the SQLite database connection that is executing /// the CREATE VIRTUAL TABLE statement. The pAux argument is the copy /// of the client data pointer that was the fourth argument to the /// sqlite3_create_module() or sqlite3_create_module_v2() call that /// registered the virtual table module. The argv parameter is an /// array of argc pointers to null terminated strings. The first /// string, argv[0], is the name of the module being invoked. The /// module name is the name provided as the second argument to /// sqlite3_create_module() and as the argument to the USING clause of /// the CREATE VIRTUAL TABLE statement that is running. The second, /// argv[1], is the name of the database in which the new virtual table /// is being created. The database name is "main" for the primary /// database, or "temp" for TEMP database, or the name given at the /// end of the ATTACH statement for attached databases. The third /// element of the array, argv[2], is the name of the new virtual /// table, as specified following the TABLE keyword in the CREATE /// VIRTUAL TABLE statement. If present, the fourth and subsequent /// strings in the argv[] array report the arguments to the module name /// in the CREATE VIRTUAL TABLE statement. /// </para> /// <para> /// The job of this method is to construct the new virtual table object /// (an sqlite3_vtab object) and return a pointer to it in *ppVTab. /// </para> /// <para> /// As part of the task of creating a new sqlite3_vtab structure, this /// method must invoke sqlite3_declare_vtab() to tell the SQLite core /// about the columns and datatypes in the virtual table. The /// sqlite3_declare_vtab() API has the following prototype: /// </para> /// <para> /// <code> /// int sqlite3_declare_vtab(sqlite3 *db, const char *zCreateTable) /// </code> /// </para> /// <para> /// The first argument to sqlite3_declare_vtab() must be the same /// database connection pointer as the first parameter to this method. /// The second argument to sqlite3_declare_vtab() must a /// zero-terminated UTF-8 string that contains a well-formed CREATE /// TABLE statement that defines the columns in the virtual table and /// their data types. The name of the table in this CREATE TABLE /// statement is ignored, as are all constraints. Only the column names /// and datatypes matter. The CREATE TABLE statement string need not to /// be held in persistent memory. The string can be deallocated and/or /// reused as soon as the sqlite3_declare_vtab() routine returns. /// </para> /// </summary> /// <param name="pDb"> /// The native database connection handle. /// </param> /// <param name="pAux"> /// The original native pointer value that was provided to the /// sqlite3_create_module(), sqlite3_create_module_v2() or /// sqlite3_create_disposable_module() functions. /// </param> /// <param name="argc"> /// The number of arguments from the CREATE VIRTUAL TABLE statement. /// </param> /// <param name="argv"> /// The array of string arguments from the CREATE VIRTUAL TABLE /// statement. /// </param> /// <param name="pVtab"> /// Upon success, this parameter must be modified to point to the newly /// created native sqlite3_vtab derived structure. /// </param> /// <param name="pError"> /// Upon failure, this parameter must be modified to point to the error /// message, with the underlying memory having been obtained from the /// sqlite3_malloc() function. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xCreate( IntPtr pDb, IntPtr pAux, int argc, IntPtr argv, ref IntPtr pVtab, ref IntPtr pError ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// The xConnect method is very similar to xCreate. It has the same /// parameters and constructs a new sqlite3_vtab structure just like /// xCreate. And it must also call sqlite3_declare_vtab() like xCreate. /// </para> /// <para> /// The difference is that xConnect is called to establish a new /// connection to an existing virtual table whereas xCreate is called /// to create a new virtual table from scratch. /// </para> /// <para> /// The xCreate and xConnect methods are only different when the /// virtual table has some kind of backing store that must be /// initialized the first time the virtual table is created. The /// xCreate method creates and initializes the backing store. The /// xConnect method just connects to an existing backing store. /// </para> /// <para> /// As an example, consider a virtual table implementation that /// provides read-only access to existing comma-separated-value (CSV) /// files on disk. There is no backing store that needs to be created /// or initialized for such a virtual table (since the CSV files /// already exist on disk) so the xCreate and xConnect methods will be /// identical for that module. /// </para> /// <para> /// Another example is a virtual table that implements a full-text /// index. The xCreate method must create and initialize data /// structures to hold the dictionary and posting lists for that index. /// The xConnect method, on the other hand, only has to locate and use /// an existing dictionary and posting lists that were created by a /// prior xCreate call. /// </para> /// <para> /// The xConnect method must return SQLITE_OK if it is successful in /// creating the new virtual table, or SQLITE_ERROR if it is not /// successful. If not successful, the sqlite3_vtab structure must not /// be allocated. An error message may optionally be returned in *pzErr /// if unsuccessful. Space to hold the error message string must be /// allocated using an SQLite memory allocation function like /// sqlite3_malloc() or sqlite3_mprintf() as the SQLite core will /// attempt to free the space using sqlite3_free() after the error has /// been reported up to the application. /// </para> /// <para> /// The xConnect method is required for every virtual table /// implementation, though the xCreate and xConnect pointers of the /// sqlite3_module object may point to the same function the virtual /// table does not need to initialize backing store. /// </para> /// </summary> /// <param name="pDb"> /// The native database connection handle. /// </param> /// <param name="pAux"> /// The original native pointer value that was provided to the /// sqlite3_create_module(), sqlite3_create_module_v2() or /// sqlite3_create_disposable_module() functions. /// </param> /// <param name="argc"> /// The number of arguments from the CREATE VIRTUAL TABLE statement. /// </param> /// <param name="argv"> /// The array of string arguments from the CREATE VIRTUAL TABLE /// statement. /// </param> /// <param name="pVtab"> /// Upon success, this parameter must be modified to point to the newly /// created native sqlite3_vtab derived structure. /// </param> /// <param name="pError"> /// Upon failure, this parameter must be modified to point to the error /// message, with the underlying memory having been obtained from the /// sqlite3_malloc() function. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xConnect( IntPtr pDb, IntPtr pAux, int argc, IntPtr argv, ref IntPtr pVtab, ref IntPtr pError ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// SQLite uses the xBestIndex method of a virtual table module to /// determine the best way to access the virtual table. The xBestIndex /// method has a prototype like this: /// </para> /// <code> /// int (*xBestIndex)(sqlite3_vtab *pVTab, sqlite3_index_info*); /// </code> /// <para> /// The SQLite core communicates with the xBestIndex method by filling /// in certain fields of the sqlite3_index_info structure and passing a /// pointer to that structure into xBestIndex as the second parameter. /// The xBestIndex method fills out other fields of this structure /// which forms the reply. The sqlite3_index_info structure looks like /// this: /// </para> /// <code> /// struct sqlite3_index_info { /// /* Inputs */ /// const int nConstraint; /* Number of entries in aConstraint */ /// const struct sqlite3_index_constraint { /// int iColumn; /* Column on left-hand side of /// * constraint */ /// unsigned char op; /* Constraint operator */ /// unsigned char usable; /* True if this constraint is usable */ /// int iTermOffset; /* Used internally - xBestIndex should /// * ignore */ /// } *const aConstraint; /* Table of WHERE clause constraints */ /// const int nOrderBy; /* Number of terms in the ORDER BY /// * clause */ /// const struct sqlite3_index_orderby { /// int iColumn; /* Column number */ /// unsigned char desc; /* True for DESC. False for ASC. */ /// } *const aOrderBy; /* The ORDER BY clause */ /// /* Outputs */ /// struct sqlite3_index_constraint_usage { /// int argvIndex; /* if greater than zero, constraint is /// * part of argv to xFilter */ /// unsigned char omit; /* Do not code a test for this /// * constraint */ /// } *const aConstraintUsage; /// int idxNum; /* Number used to identify the index */ /// char *idxStr; /* String, possibly obtained from /// * sqlite3_malloc() */ /// int needToFreeIdxStr; /* Free idxStr using sqlite3_free() if /// * true */ /// int orderByConsumed; /* True if output is already ordered */ /// double estimatedCost; /* Estimated cost of using this index */ /// }; /// </code> /// <para> /// In addition, there are some defined constants: /// </para> /// <code> /// #define SQLITE_INDEX_CONSTRAINT_EQ 2 /// #define SQLITE_INDEX_CONSTRAINT_GT 4 /// #define SQLITE_INDEX_CONSTRAINT_LE 8 /// #define SQLITE_INDEX_CONSTRAINT_LT 16 /// #define SQLITE_INDEX_CONSTRAINT_GE 32 /// #define SQLITE_INDEX_CONSTRAINT_MATCH 64 /// </code> /// <para> /// The SQLite core calls the xBestIndex method when it is compiling a /// query that involves a virtual table. In other words, SQLite calls /// this method when it is running sqlite3_prepare() or the equivalent. /// By calling this method, the SQLite core is saying to the virtual /// table that it needs to access some subset of the rows in the /// virtual table and it wants to know the most efficient way to do /// that access. The xBestIndex method replies with information that /// the SQLite core can then use to conduct an efficient search of the /// virtual table. /// </para> /// <para> /// While compiling a single SQL query, the SQLite core might call /// xBestIndex multiple times with different settings in /// sqlite3_index_info. The SQLite core will then select the /// combination that appears to give the best performance. /// </para> /// <para> /// Before calling this method, the SQLite core initializes an instance /// of the sqlite3_index_info structure with information about the /// query that it is currently trying to process. This information /// derives mainly from the WHERE clause and ORDER BY or GROUP BY /// clauses of the query, but also from any ON or USING clauses if the /// query is a join. The information that the SQLite core provides to /// the xBestIndex method is held in the part of the structure that is /// marked as "Inputs". The "Outputs" section is initialized to zero. /// </para> /// <para> /// The information in the sqlite3_index_info structure is ephemeral /// and may be overwritten or deallocated as soon as the xBestIndex /// method returns. If the xBestIndex method needs to remember any part /// of the sqlite3_index_info structure, it should make a copy. Care /// must be take to store the copy in a place where it will be /// deallocated, such as in the idxStr field with needToFreeIdxStr set /// to 1. /// </para> /// <para> /// Note that xBestIndex will always be called before xFilter, since /// the idxNum and idxStr outputs from xBestIndex are required inputs /// to xFilter. However, there is no guarantee that xFilter will be /// called following a successful xBestIndex. /// </para> /// <para> /// The xBestIndex method is required for every virtual table /// implementation. /// </para> /// <para> /// 2.3.1 Inputs /// </para> /// <para> /// The main thing that the SQLite core is trying to communicate to the /// virtual table is the constraints that are available to limit the /// number of rows that need to be searched. The aConstraint[] array /// contains one entry for each constraint. There will be exactly /// nConstraint entries in that array. /// </para> /// <para> /// Each constraint will correspond to a term in the WHERE clause or in /// a USING or ON clause that is of the form /// </para> /// <code> /// column OP EXPR /// </code> /// <para> /// Where "column" is a column in the virtual table, OP is an operator /// like "=" or "<", and EXPR is an arbitrary expression. So, for /// example, if the WHERE clause contained a term like this: /// </para> /// <code> /// a = 5 /// </code> /// <para> /// Then one of the constraints would be on the "a" column with /// operator "=" and an expression of "5". Constraints need not have a /// literal representation of the WHERE clause. The query optimizer /// might make transformations to the WHERE clause in order to extract /// as many constraints as it can. So, for example, if the WHERE clause /// contained something like this: /// </para> /// <code> /// x BETWEEN 10 AND 100 AND 999>y /// </code> /// <para> /// The query optimizer might translate this into three separate /// constraints: /// </para> /// <code> /// x >= 10 /// x <= 100 /// y < 999 /// </code> /// <para> /// For each constraint, the aConstraint[].iColumn field indicates /// which column appears on the left-hand side of the constraint. The /// first column of the virtual table is column 0. The rowid of the /// virtual table is column -1. The aConstraint[].op field indicates /// which operator is used. The SQLITE_INDEX_CONSTRAINT_* constants map /// integer constants into operator values. Columns occur in the order /// they were defined by the call to sqlite3_declare_vtab() in the /// xCreate or xConnect method. Hidden columns are counted when /// determining the column index. /// </para> /// <para> /// The aConstraint[] array contains information about all constraints /// that apply to the virtual table. But some of the constraints might /// not be usable because of the way tables are ordered in a join. The /// xBestIndex method must therefore only consider constraints that /// have an aConstraint[].usable flag which is true. /// </para> /// <para> /// In addition to WHERE clause constraints, the SQLite core also tells /// the xBestIndex method about the ORDER BY clause. (In an aggregate /// query, the SQLite core might put in GROUP BY clause information in /// place of the ORDER BY clause information, but this fact should not /// make any difference to the xBestIndex method.) If all terms of the /// ORDER BY clause are columns in the virtual table, then nOrderBy /// will be the number of terms in the ORDER BY clause and the /// aOrderBy[] array will identify the column for each term in the /// order by clause and whether or not that column is ASC or DESC. /// </para> /// <para> /// 2.3.2 Outputs /// </para> /// <para> /// Given all of the information above, the job of the xBestIndex /// method it to figure out the best way to search the virtual table. /// </para> /// <para> /// The xBestIndex method fills the idxNum and idxStr fields with /// information that communicates an indexing strategy to the xFilter /// method. The information in idxNum and idxStr is arbitrary as far as /// the SQLite core is concerned. The SQLite core just copies the /// information through to the xFilter method. Any desired meaning can /// be assigned to idxNum and idxStr as long as xBestIndex and xFilter /// agree on what that meaning is. /// </para> /// <para> /// The idxStr value may be a string obtained from an SQLite memory /// allocation function such as sqlite3_mprintf(). If this is the case, /// then the needToFreeIdxStr flag must be set to true so that the /// SQLite core will know to call sqlite3_free() on that string when it /// has finished with it, and thus avoid a memory leak. /// </para> /// <para> /// If the virtual table will output rows in the order specified by the /// ORDER BY clause, then the orderByConsumed flag may be set to true. /// If the output is not automatically in the correct order then /// orderByConsumed must be left in its default false setting. This /// will indicate to the SQLite core that it will need to do a separate /// sorting pass over the data after it comes out of the virtual table. /// </para> /// <para> /// The estimatedCost field should be set to the estimated number of /// disk access operations required to execute this query against the /// virtual table. The SQLite core will often call xBestIndex multiple /// times with different constraints, obtain multiple cost estimates, /// then choose the query plan that gives the lowest estimate. /// </para> /// <para> /// The aConstraintUsage[] array contains one element for each of the /// nConstraint constraints in the inputs section of the /// sqlite3_index_info structure. The aConstraintUsage[] array is used /// by xBestIndex to tell the core how it is using the constraints. /// </para> /// <para> /// The xBestIndex method may set aConstraintUsage[].argvIndex entries /// to values greater than one. Exactly one entry should be set to 1, /// another to 2, another to 3, and so forth up to as many or as few as /// the xBestIndex method wants. The EXPR of the corresponding /// constraints will then be passed in as the argv[] parameters to /// xFilter. /// </para> /// <para> /// For example, if the aConstraint[3].argvIndex is set to 1, then when /// xFilter is called, the argv[0] passed to xFilter will have the EXPR /// value of the aConstraint[3] constraint. /// </para> /// <para> /// By default, the SQLite core double checks all constraints on each /// row of the virtual table that it receives. If such a check is /// redundant, the xBestFilter method can suppress that double-check by /// setting aConstraintUsage[].omit. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="pIndex"> /// The native pointer to the sqlite3_index_info structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xBestIndex( IntPtr pVtab, IntPtr pIndex ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method releases a connection to a virtual table. Only the /// sqlite3_vtab object is destroyed. The virtual table is not /// destroyed and any backing store associated with the virtual table /// persists. This method undoes the work of xConnect. /// </para> /// <para> /// This method is a destructor for a connection to the virtual table. /// Contrast this method with xDestroy. The xDestroy is a destructor /// for the entire virtual table. /// </para> /// <para> /// The xDisconnect method is required for every virtual table /// implementation, though it is acceptable for the xDisconnect and /// xDestroy methods to be the same function if that makes sense for /// the particular virtual table. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xDisconnect( IntPtr pVtab ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method releases a connection to a virtual table, just like the /// xDisconnect method, and it also destroys the underlying table /// implementation. This method undoes the work of xCreate. /// </para> /// <para> /// The xDisconnect method is called whenever a database connection /// that uses a virtual table is closed. The xDestroy method is only /// called when a DROP TABLE statement is executed against the virtual /// table. /// </para> /// <para> /// The xDestroy method is required for every virtual table /// implementation, though it is acceptable for the xDisconnect and /// xDestroy methods to be the same function if that makes sense for /// the particular virtual table. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xDestroy( IntPtr pVtab ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// The xOpen method creates a new cursor used for accessing (read /// and/or writing) a virtual table. A successful invocation of this /// method will allocate the memory for the sqlite3_vtab_cursor (or a /// subclass), initialize the new object, and make *ppCursor point to /// the new object. The successful call then returns SQLITE_OK. /// </para> /// <para> /// For every successful call to this method, the SQLite core will /// later invoke the xClose method to destroy the allocated cursor. /// </para> /// <para> /// The xOpen method need not initialize the pVtab field of the /// sqlite3_vtab_cursor structure. The SQLite core will take care of /// that chore automatically. /// </para> /// <para> /// A virtual table implementation must be able to support an arbitrary /// number of simultaneously open cursors. /// </para> /// <para> /// When initially opened, the cursor is in an undefined state. The /// SQLite core will invoke the xFilter method on the cursor prior to /// any attempt to position or read from the cursor. /// </para> /// <para> /// The xOpen method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="pCursor"> /// Upon success, this parameter must be modified to point to the newly /// created native sqlite3_vtab_cursor derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xOpen( IntPtr pVtab, ref IntPtr pCursor ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// The xClose method closes a cursor previously opened by xOpen. The /// SQLite core will always call xClose once for each cursor opened /// using xOpen. /// </para> /// <para> /// This method must release all resources allocated by the /// corresponding xOpen call. The routine will not be called again even /// if it returns an error. The SQLite core will not use the /// sqlite3_vtab_cursor again after it has been closed. /// </para> /// <para> /// The xClose method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pCursor"> /// The native pointer to the sqlite3_vtab_cursor derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xClose( IntPtr pCursor ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method begins a search of a virtual table. The first argument /// is a cursor opened by xOpen. The next two argument define a /// particular search index previously chosen by xBestIndex. The /// specific meanings of idxNum and idxStr are unimportant as long as /// xFilter and xBestIndex agree on what that meaning is. /// </para> /// <para> /// The xBestIndex function may have requested the values of certain /// expressions using the aConstraintUsage[].argvIndex values of the /// sqlite3_index_info structure. Those values are passed to xFilter /// using the argc and argv parameters. /// </para> /// <para> /// If the virtual table contains one or more rows that match the /// search criteria, then the cursor must be left point at the first /// row. Subsequent calls to xEof must return false (zero). If there /// are no rows match, then the cursor must be left in a state that /// will cause the xEof to return true (non-zero). The SQLite engine /// will use the xColumn and xRowid methods to access that row content. /// The xNext method will be used to advance to the next row. /// </para> /// <para> /// This method must return SQLITE_OK if successful, or an sqlite error /// code if an error occurs. /// </para> /// <para> /// The xFilter method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pCursor"> /// The native pointer to the sqlite3_vtab_cursor derived structure. /// </param> /// <param name="idxNum"> /// Number used to help identify the selected index. /// </param> /// <param name="idxStr"> /// The native pointer to the UTF-8 encoded string containing the /// string used to help identify the selected index. /// </param> /// <param name="argc"> /// The number of native pointers to sqlite3_value structures specified /// in <paramref name="argv" />. /// </param> /// <param name="argv"> /// An array of native pointers to sqlite3_value structures containing /// filtering criteria for the selected index. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xFilter( IntPtr pCursor, int idxNum, IntPtr idxStr, int argc, IntPtr argv ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// The xNext method advances a virtual table cursor to the next row of /// a result set initiated by xFilter. If the cursor is already /// pointing at the last row when this routine is called, then the /// cursor no longer points to valid data and a subsequent call to the /// xEof method must return true (non-zero). If the cursor is /// successfully advanced to another row of content, then subsequent /// calls to xEof must return false (zero). /// </para> /// <para> /// This method must return SQLITE_OK if successful, or an sqlite error /// code if an error occurs. /// </para> /// <para> /// The xNext method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pCursor"> /// The native pointer to the sqlite3_vtab_cursor derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xNext( IntPtr pCursor ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// The xEof method must return false (zero) if the specified cursor /// currently points to a valid row of data, or true (non-zero) /// otherwise. This method is called by the SQL engine immediately /// after each xFilter and xNext invocation. /// </para> /// <para> /// The xEof method is required for every virtual table implementation. /// </para> /// </summary> /// <param name="pCursor"> /// The native pointer to the sqlite3_vtab_cursor derived structure. /// </param> /// <returns> /// Non-zero if no more rows are available; zero otherwise. /// </returns> int xEof( IntPtr pCursor ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// The SQLite core invokes this method in order to find the value for /// the N-th column of the current row. N is zero-based so the first /// column is numbered 0. The xColumn method may return its result back /// to SQLite using one of the following interface: /// </para> /// <code> /// sqlite3_result_blob() /// sqlite3_result_double() /// sqlite3_result_int() /// sqlite3_result_int64() /// sqlite3_result_null() /// sqlite3_result_text() /// sqlite3_result_text16() /// sqlite3_result_text16le() /// sqlite3_result_text16be() /// sqlite3_result_zeroblob() /// </code> /// <para> /// If the xColumn method implementation calls none of the functions /// above, then the value of the column defaults to an SQL NULL. /// </para> /// <para> /// To raise an error, the xColumn method should use one of the /// result_text() methods to set the error message text, then return an /// appropriate error code. The xColumn method must return SQLITE_OK on /// success. /// </para> /// <para> /// The xColumn method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pCursor"> /// The native pointer to the sqlite3_vtab_cursor derived structure. /// </param> /// <param name="pContext"> /// The native pointer to the sqlite3_context structure to be used /// for returning the specified column value to the SQLite core /// library. /// </param> /// <param name="index"> /// The zero-based index corresponding to the column containing the /// value to be returned. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xColumn( IntPtr pCursor, IntPtr pContext, int index ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// A successful invocation of this method will cause *pRowid to be /// filled with the rowid of row that the virtual table cursor pCur is /// currently pointing at. This method returns SQLITE_OK on success. It /// returns an appropriate error code on failure. /// </para> /// <para> /// The xRowid method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pCursor"> /// The native pointer to the sqlite3_vtab_cursor derived structure. /// </param> /// <param name="rowId"> /// Upon success, this parameter must be modified to contain the unique /// integer row identifier for the current row for the specified cursor. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xRowId( IntPtr pCursor, ref long rowId ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// All changes to a virtual table are made using the xUpdate method. /// This one method can be used to insert, delete, or update. /// </para> /// <para> /// The argc parameter specifies the number of entries in the argv /// array. The value of argc will be 1 for a pure delete operation or /// N+2 for an insert or replace or update where N is the number of /// columns in the table. In the previous sentence, N includes any /// hidden columns. /// </para> /// <para> /// Every argv entry will have a non-NULL value in C but may contain /// the SQL value NULL. In other words, it is always true that /// argv[i]!=0 for i between 0 and argc-1. However, it might be the /// case that sqlite3_value_type(argv[i])==SQLITE_NULL. /// </para> /// <para> /// The argv[0] parameter is the rowid of a row in the virtual table /// to be deleted. If argv[0] is an SQL NULL, then no deletion occurs. /// </para> /// <para> /// The argv[1] parameter is the rowid of a new row to be inserted into /// the virtual table. If argv[1] is an SQL NULL, then the /// implementation must choose a rowid for the newly inserted row. /// Subsequent argv[] entries contain values of the columns of the /// virtual table, in the order that the columns were declared. The /// number of columns will match the table declaration that the /// xConnect or xCreate method made using the sqlite3_declare_vtab() /// call. All hidden columns are included. /// </para> /// <para> /// When doing an insert without a rowid (argc>1, argv[1] is an SQL /// NULL), the implementation must set *pRowid to the rowid of the /// newly inserted row; this will become the value returned by the /// sqlite3_last_insert_rowid() function. Setting this value in all the /// other cases is a harmless no-op; the SQLite engine ignores the /// *pRowid return value if argc==1 or argv[1] is not an SQL NULL. /// </para> /// <para> /// Each call to xUpdate will fall into one of cases shown below. Note /// that references to argv[i] mean the SQL value held within the /// argv[i] object, not the argv[i] object itself. /// </para> /// <code> /// argc = 1 /// </code> /// <para> /// The single row with rowid equal to argv[0] is deleted. No /// insert occurs. /// </para> /// <code> /// argc > 1 /// argv[0] = NULL /// </code> /// <para> /// A new row is inserted with a rowid argv[1] and column /// values in argv[2] and following. If argv[1] is an SQL NULL, /// the a new unique rowid is generated automatically. /// </para> /// <code> /// argc > 1 /// argv[0] ? NULL /// argv[0] = argv[1] /// </code> /// <para> /// The row with rowid argv[0] is updated with new values in /// argv[2] and following parameters. /// </para> /// <code> /// argc > 1 /// argv[0] ? NULL /// argv[0] ? argv[1] /// </code> /// <para> /// The row with rowid argv[0] is updated with rowid argv[1] /// and new values in argv[2] and following parameters. This /// will occur when an SQL statement updates a rowid, as in /// the statement: /// </para> /// <code> /// UPDATE table SET rowid=rowid+1 WHERE ...; /// </code> /// <para> /// The xUpdate method must return SQLITE_OK if and only if it is /// successful. If a failure occurs, the xUpdate must return an /// appropriate error code. On a failure, the pVTab->zErrMsg element /// may optionally be replaced with error message text stored in memory /// allocated from SQLite using functions such as sqlite3_mprintf() or /// sqlite3_malloc(). /// </para> /// <para> /// If the xUpdate method violates some constraint of the virtual table /// (including, but not limited to, attempting to store a value of the /// wrong datatype, attempting to store a value that is too large or /// too small, or attempting to change a read-only value) then the /// xUpdate must fail with an appropriate error code. /// </para> /// <para> /// There might be one or more sqlite3_vtab_cursor objects open and in /// use on the virtual table instance and perhaps even on the row of /// the virtual table when the xUpdate method is invoked. The /// implementation of xUpdate must be prepared for attempts to delete /// or modify rows of the table out from other existing cursors. If the /// virtual table cannot accommodate such changes, the xUpdate method /// must return an error code. /// </para> /// <para> /// The xUpdate method is optional. If the xUpdate pointer in the /// sqlite3_module for a virtual table is a NULL pointer, then the /// virtual table is read-only. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="argc"> /// The number of new or modified column values contained in /// <paramref name="argv" />. /// </param> /// <param name="argv"> /// The array of native pointers to sqlite3_value structures containing /// the new or modified column values, if any. /// </param> /// <param name="rowId"> /// Upon success, this parameter must be modified to contain the unique /// integer row identifier for the row that was inserted, if any. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xUpdate( IntPtr pVtab, int argc, IntPtr argv, ref long rowId ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method begins a transaction on a virtual table. This is method /// is optional. The xBegin pointer of sqlite3_module may be NULL. /// </para> /// <para> /// This method is always followed by one call to either the xCommit or /// xRollback method. Virtual table transactions do not nest, so the /// xBegin method will not be invoked more than once on a single /// virtual table without an intervening call to either xCommit or /// xRollback. Multiple calls to other methods can and likely will /// occur in between the xBegin and the corresponding xCommit or /// xRollback. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xBegin( IntPtr pVtab ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method signals the start of a two-phase commit on a virtual /// table. This is method is optional. The xSync pointer of /// sqlite3_module may be NULL. /// </para> /// <para> /// This method is only invoked after call to the xBegin method and /// prior to an xCommit or xRollback. In order to implement two-phase /// commit, the xSync method on all virtual tables is invoked prior to /// invoking the xCommit method on any virtual table. If any of the /// xSync methods fail, the entire transaction is rolled back. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xSync( IntPtr pVtab ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method causes a virtual table transaction to commit. This is /// method is optional. The xCommit pointer of sqlite3_module may be /// NULL. /// </para> /// <para> /// A call to this method always follows a prior call to xBegin and /// xSync. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xCommit( IntPtr pVtab ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method causes a virtual table transaction to rollback. This is /// method is optional. The xRollback pointer of sqlite3_module may be /// NULL. /// </para> /// <para> /// A call to this method always follows a prior call to xBegin. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xRollback( IntPtr pVtab ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method provides notification that the virtual table /// implementation that the virtual table will be given a new name. If /// this method returns SQLITE_OK then SQLite renames the table. If /// this method returns an error code then the renaming is prevented. /// </para> /// <para> /// The xRename method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="nArg"> /// The number of arguments to the function being sought. /// </param> /// <param name="zName"> /// The name of the function being sought. /// </param> /// <param name="callback"> /// Upon success, this parameter must be modified to contain the /// delegate responsible for implementing the specified function. /// </param> /// <param name="pClientData"> /// Upon success, this parameter must be modified to contain the /// native user-data pointer associated with /// <paramref name="callback" />. /// </param> /// <returns> /// Non-zero if the specified function was found; zero otherwise. /// </returns> int xFindFunction( IntPtr pVtab, int nArg, IntPtr zName, ref SQLiteCallback callback, ref IntPtr pClientData ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// This method provides notification that the virtual table /// implementation that the virtual table will be given a new name. If /// this method returns SQLITE_OK then SQLite renames the table. If /// this method returns an error code then the renaming is prevented. /// </para> /// <para> /// The xRename method is required for every virtual table /// implementation. /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="zNew"> /// The native pointer to the UTF-8 encoded string containing the new /// name for the virtual table. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xRename( IntPtr pVtab, IntPtr zNew ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// These methods provide the virtual table implementation an /// opportunity to implement nested transactions. They are always /// optional and will only be called in SQLite version 3.7.7 and later. /// </para> /// <para> /// When xSavepoint(X,N) is invoked, that is a signal to the virtual /// table X that it should save its current state as savepoint N. A /// subsequent call to xRollbackTo(X,R) means that the state of the /// virtual table should return to what it was when xSavepoint(X,R) was /// last called. The call to xRollbackTo(X,R) will invalidate all /// savepoints with N>R; none of the invalided savepoints will be /// rolled back or released without first being reinitialized by a call /// to xSavepoint(). A call to xRelease(X,M) invalidates all savepoints /// where N>=M. /// </para> /// <para> /// None of the xSavepoint(), xRelease(), or xRollbackTo() methods will /// ever be called except in between calls to xBegin() and either /// xCommit() or xRollback(). /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="iSavepoint"> /// This is an integer identifier under which the the current state of /// the virtual table should be saved. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xSavepoint( IntPtr pVtab, int iSavepoint ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// These methods provide the virtual table implementation an /// opportunity to implement nested transactions. They are always /// optional and will only be called in SQLite version 3.7.7 and later. /// </para> /// <para> /// When xSavepoint(X,N) is invoked, that is a signal to the virtual /// table X that it should save its current state as savepoint N. A /// subsequent call to xRollbackTo(X,R) means that the state of the /// virtual table should return to what it was when xSavepoint(X,R) was /// last called. The call to xRollbackTo(X,R) will invalidate all /// savepoints with N>R; none of the invalided savepoints will be /// rolled back or released without first being reinitialized by a call /// to xSavepoint(). A call to xRelease(X,M) invalidates all savepoints /// where N>=M. /// </para> /// <para> /// None of the xSavepoint(), xRelease(), or xRollbackTo() methods will /// ever be called except in between calls to xBegin() and either /// xCommit() or xRollback(). /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="iSavepoint"> /// This is an integer used to indicate that any saved states with an /// identifier greater than or equal to this should be deleted by the /// virtual table. /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xRelease( IntPtr pVtab, int iSavepoint ); /////////////////////////////////////////////////////////////////////// /// <summary> /// <para> /// These methods provide the virtual table implementation an /// opportunity to implement nested transactions. They are always /// optional and will only be called in SQLite version 3.7.7 and later. /// </para> /// <para> /// When xSavepoint(X,N) is invoked, that is a signal to the virtual /// table X that it should save its current state as savepoint N. A /// subsequent call to xRollbackTo(X,R) means that the state of the /// virtual table should return to what it was when xSavepoint(X,R) was /// last called. The call to xRollbackTo(X,R) will invalidate all /// savepoints with N>R; none of the invalided savepoints will be /// rolled back or released without first being reinitialized by a call /// to xSavepoint(). A call to xRelease(X,M) invalidates all savepoints /// where N>=M. /// </para> /// <para> /// None of the xSavepoint(), xRelease(), or xRollbackTo() methods will /// ever be called except in between calls to xBegin() and either /// xCommit() or xRollback(). /// </para> /// </summary> /// <param name="pVtab"> /// The native pointer to the sqlite3_vtab derived structure. /// </param> /// <param name="iSavepoint"> /// This is an integer identifier used to specify a specific saved /// state for the virtual table for it to restore itself back to, which /// should also have the effect of deleting all saved states with an /// integer identifier greater than this one. /// <list type=""></list> /// </param> /// <returns> /// A standard SQLite return code. /// </returns> SQLiteErrorCode xRollbackTo( IntPtr pVtab, int iSavepoint ); } #endregion } |
Changes to System.Data.SQLite/SQLiteModule.cs.
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2057 2058 2059 2060 2061 2062 2063 | public interface ISQLiteNativeHandle { /// <summary> /// The native handle value. /// </summary> IntPtr NativeHandle { get; } } | < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < | 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 | public interface ISQLiteNativeHandle { /// <summary> /// The native handle value. /// </summary> IntPtr NativeHandle { get; } } #endregion /////////////////////////////////////////////////////////////////////////// #region ISQLiteManagedModule Interface /// <summary> /// This interface represents a virtual table implementation written in |
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Changes to System.Data.SQLite/Targets/System.Data.SQLite.Files.targets.
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99 100 101 102 103 104 105 106 107 108 109 110 111 | <!-- ****************************************************************************** ** Virtual Table Files ** ****************************************************************************** --> <ItemGroup Condition="'$(InteropVirtualTable)' != 'false'"> <Compile Include="SQLiteModule.cs" /> <Compile Include="SQLiteModuleCommon.cs" /> <Compile Include="SQLiteModuleEnumerable.cs" /> <Compile Include="SQLiteModuleNoop.cs" /> </ItemGroup> </Project> | > | 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | <!-- ****************************************************************************** ** Virtual Table Files ** ****************************************************************************** --> <ItemGroup Condition="'$(InteropVirtualTable)' != 'false'"> <Compile Include="ISQLiteNativeModule.cs" /> <Compile Include="SQLiteModule.cs" /> <Compile Include="SQLiteModuleCommon.cs" /> <Compile Include="SQLiteModuleEnumerable.cs" /> <Compile Include="SQLiteModuleNoop.cs" /> </ItemGroup> </Project> |