System.Data.SQLite

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Overview
Comment:The GetSchemaTable method must verify the base table name (for a column) actually refers to a base table before attempting to query its metadata. Pursuant to [baf42ee135].
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SHA1: 63ae5401bfd3fbba2468b9f7cdaf862537987640
User & Date: mistachkin 2018-03-09 17:45:03.163
Context
2018-03-09
21:47
Fix typos in the data reader class that could lead to them returning the wrong value for GetDatabaseName / GetTableName methods. check-in: 785601b768 user: mistachkin tags: trunk
17:45
The GetSchemaTable method must verify the base table name (for a column) actually refers to a base table before attempting to query its metadata. Pursuant to [baf42ee135]. check-in: 63ae5401bf user: mistachkin tags: trunk
17:41
Further improvements to the catalog name and master table name handling in the connection class. check-in: 9bb5fe6f96 user: mistachkin tags: trunk
Changes
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Changes to System.Data.SQLite/SQLite3.cs.
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      int len = 0;
      return UTF8ToString(UnsafeNativeMethods.sqlite3_column_table_name_interop(stmt._sqlite_stmt, index, ref len), len);
#else
      return UTF8ToString(UnsafeNativeMethods.sqlite3_column_table_name(stmt._sqlite_stmt, index), -1);
#endif
    }

    internal override bool DoesTableExist(
        string dataBase,
        string table
        )
    {
        string dataType = null; /* NOT USED */
        string collateSequence = null; /* NOT USED */
        bool notNull = false; /* NOT USED */
        bool primaryKey = false; /* NOT USED */
        bool autoIncrement = false; /* NOT USED */

        return ColumnMetaData(
            dataBase, table, null, false, ref dataType,
            ref collateSequence, ref notNull, ref primaryKey,
            ref autoIncrement);
    }

    internal override void ColumnMetaData(string dataBase, string table, string column, ref string dataType, ref string collateSequence, ref bool notNull, ref bool primaryKey, ref bool autoIncrement)
    internal override bool ColumnMetaData(string dataBase, string table, string column, bool canThrow, ref string dataType, ref string collateSequence, ref bool notNull, ref bool primaryKey, ref bool autoIncrement)
    {
      IntPtr dataTypePtr = IntPtr.Zero;
      IntPtr collSeqPtr = IntPtr.Zero;
      int nnotNull = 0;
      int nprimaryKey = 0;
      int nautoInc = 0;
      SQLiteErrorCode n;
      int dtLen;
      int csLen;

#if !SQLITE_STANDARD
      dtLen = 0;
      csLen = 0;
      n = UnsafeNativeMethods.sqlite3_table_column_metadata_interop(_sql, ToUTF8(dataBase), ToUTF8(table), ToUTF8(column), ref dataTypePtr, ref collSeqPtr, ref nnotNull, ref nprimaryKey, ref nautoInc, ref dtLen, ref csLen);
#else
      dtLen = -1;
      csLen = -1;

      n = UnsafeNativeMethods.sqlite3_table_column_metadata(_sql, ToUTF8(dataBase), ToUTF8(table), ToUTF8(column), ref dataTypePtr, ref collSeqPtr, ref nnotNull, ref nprimaryKey, ref nautoInc);
#endif
      if (n != SQLiteErrorCode.Ok) throw new SQLiteException(n, GetLastError());
      if (canThrow && (n != SQLiteErrorCode.Ok)) throw new SQLiteException(n, GetLastError());

      dataType = UTF8ToString(dataTypePtr, dtLen);
      collateSequence = UTF8ToString(collSeqPtr, csLen);

      notNull = (nnotNull == 1);
      primaryKey = (nprimaryKey == 1);
      autoIncrement = (nautoInc == 1);

      return (n == SQLiteErrorCode.Ok);
    }

    internal override object GetObject(SQLiteStatement stmt, int index)
    {
        switch (ColumnAffinity(stmt, index))
        {
            case TypeAffinity.Int64:
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Changes to System.Data.SQLite/SQLiteBase.cs.
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    internal abstract string ColumnName(SQLiteStatement stmt, int index);
    internal abstract TypeAffinity ColumnAffinity(SQLiteStatement stmt, int index);
    internal abstract string ColumnType(SQLiteStatement stmt, int index, ref TypeAffinity nAffinity);
    internal abstract int ColumnIndex(SQLiteStatement stmt, string columnName);
    internal abstract string ColumnOriginalName(SQLiteStatement stmt, int index);
    internal abstract string ColumnDatabaseName(SQLiteStatement stmt, int index);
    internal abstract string ColumnTableName(SQLiteStatement stmt, int index);
    internal abstract bool DoesTableExist(string dataBase, string table);
    internal abstract void ColumnMetaData(string dataBase, string table, string column, ref string dataType, ref string collateSequence, ref bool notNull, ref bool primaryKey, ref bool autoIncrement);
    internal abstract bool ColumnMetaData(string dataBase, string table, string column, bool canThrow, ref string dataType, ref string collateSequence, ref bool notNull, ref bool primaryKey, ref bool autoIncrement);
    internal abstract void GetIndexColumnExtendedInfo(string database, string index, string column, ref int sortMode, ref int onError, ref string collationSequence);

    internal abstract object GetObject(SQLiteStatement stmt, int index);
    internal abstract double GetDouble(SQLiteStatement stmt, int index);
    internal abstract Boolean GetBoolean(SQLiteStatement stmt, int index);
    internal abstract SByte GetSByte(SQLiteStatement stmt, int index);
    internal abstract Byte GetByte(SQLiteStatement stmt, int index);
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Changes to System.Data.SQLite/SQLiteDataReader.cs.
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      //         because it was in its original underlying database table
      //         if there are now multiple tables involved in the
      //         "result set".  See ticket [7e3fa93744] for more detailed
      //         information.
      //
      Dictionary<ColumnParent, List<int>> parentToColumns = null;
      Dictionary<int, ColumnParent> columnToParent = null;
        SQLiteBase sql = _command.Connection._sql;

      GetStatementColumnParents(
          _command.Connection._sql, _activeStatement, _fieldCount,
            sql, _activeStatement, _fieldCount,
          ref parentToColumns, ref columnToParent);

      DataTable tbl = new DataTable("SchemaTable");
      DataTable tblIndexes = null;
      DataTable tblIndexColumns;
      DataRow row;
      string temp;
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              baseCatalogName = (string)row[SchemaTableOptionalColumn.BaseCatalogName];

          string baseTableName = String.Empty;

          if (row[SchemaTableColumn.BaseTableName] != DBNull.Value)
              baseTableName = (string)row[SchemaTableColumn.BaseTableName];

                if (sql.DoesTableExist(baseCatalogName, baseTableName))
                {
          string baseColumnName = String.Empty;

          if (row[SchemaTableColumn.BaseColumnName] != DBNull.Value)
              baseColumnName = (string)row[SchemaTableColumn.BaseColumnName];

          string collSeq = null;
          bool bNotNull = false;
          bool bPrimaryKey = false;
          bool bAutoIncrement = false;
          string[] arSize;

          // Get the column meta data
          _command.Connection._sql.ColumnMetaData(
            baseCatalogName,
            baseTableName,
            strColumn,
                        true,
            ref dataType, ref collSeq, ref bNotNull, ref bPrimaryKey, ref bAutoIncrement);

          if (bNotNull || bPrimaryKey) row[SchemaTableColumn.AllowDBNull] = false;
          bool allowDbNull = (bool)row[SchemaTableColumn.AllowDBNull];

          row[SchemaTableColumn.IsKey] = bPrimaryKey && CountParents(parentToColumns) <= 1;
          row[SchemaTableOptionalColumn.IsAutoIncrement] = bAutoIncrement;
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              }
            }
          }

          // Determine IsUnique properly, which is a pain in the butt!
          if (wantUniqueInfo)
          {
            if (baseCatalogName != strCatalog
                        if (baseCatalogName != strCatalog || baseTableName != strTable)
              || baseTableName != strTable)
            {
              strCatalog = baseCatalogName;
              strTable = baseTableName;

              tblIndexes = _command.Connection.GetSchema("Indexes", new string[] {
                baseCatalogName,
                null,
                baseTableName,
                null });
                                null
                            });
            }

            foreach (DataRow rowIndexes in tblIndexes.Rows)
            {
              tblIndexColumns = _command.Connection.GetSchema("IndexColumns", new string[] {
                baseCatalogName,
                null,
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                    row[SchemaTableColumn.IsUnique] = rowIndexes["UNIQUE"];

                  // If its an integer primary key and the only primary key in the table, then its a rowid alias and is autoincrement
                  // NOTE:  Currently commented out because this is not always the desired behavior.  For example, a 1:1 relationship with
                  //        another table, where the other table is autoincrement, but this one is not, and uses the rowid from the other.
                  //        It is safer to only set Autoincrement on tables where we're SURE the user specified AUTOINCREMENT, even if its a rowid column.

                  if (tblIndexColumns.Rows.Count == 1 && (bool)rowIndexes["PRIMARY_KEY"] == true && String.IsNullOrEmpty(dataType) == false &&
                    String.Compare(dataType, "integer", StringComparison.OrdinalIgnoreCase) == 0)
                                    //if (tblIndexColumns.Rows.Count == 1 && (bool)rowIndexes["PRIMARY_KEY"] == true && String.IsNullOrEmpty(dataType) == false &&
                                    //  String.Compare(dataType, "integer", StringComparison.OrdinalIgnoreCase) == 0)
                  {
                    //  row[SchemaTableOptionalColumn.IsAutoIncrement] = true;
                                    //{
                                    //    //  row[SchemaTableOptionalColumn.IsAutoIncrement] = true;
                  }
                                    //}

                  break;
                }
              }
            }
          }
                }

          if (String.IsNullOrEmpty(dataType))
          {
            TypeAffinity affin = TypeAffinity.Uninitialized;
            dataType = _activeStatement._sql.ColumnType(_activeStatement, n, ref affin);
          }

          if (String.IsNullOrEmpty(dataType) == false)
            row["DataTypeName"] = dataType;
        }

        tbl.Rows.Add(row);
      }

      if (_keyInfo != null)
        _keyInfo.AppendSchemaTable(tbl);

      tbl.AcceptChanges();
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