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tony |
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unit IBSystemTables;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, IBSQL, IBDatabase;
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type
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{ TIBSystemTables }
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TIBSystemTables = class
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private
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FGetTableNames: TIBSQL;
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FGetFieldNames: TIBSQL;
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FGetPrimaryKeys: TIBSQL;
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FTestSQL: TIBSQL;
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FTableAndColumnSQL: TIBSQL;
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FGetGeneratorsSQL: TIBSQL;
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function GetSQLType(SQLType: TIBSQLTypes): string;
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procedure AddWhereClause(TableName: string; QuotedStrings: boolean; SQL: TStrings);
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public
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constructor Create;
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destructor Destroy; override;
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procedure SelectDatabase(Database: TIBDatabase; Transaction: TIBTransaction);
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procedure GetTableNames(TableNames: TStrings);
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procedure GetFieldNames(TableName: string; FieldNames: TStrings;
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IncludePrimaryKeys:boolean=true);
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procedure GetPrimaryKeys(TableName: string; PrimaryKeys: TStrings);
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procedure GetTableAndColumns(SelectSQL: string; var FirstTableName: string;
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Columns: TStrings);
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procedure GetGenerators(GeneratorNames: TStrings);
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procedure GenerateSelectSQL(TableName: string; QuotedStrings: boolean; SQL: TStrings);
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procedure GenerateRefreshSQL(TableName: string; QuotedStrings: boolean; SQL: TStrings);
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procedure GenerateInsertSQL(TableName: string; QuotedStrings: boolean; FieldNames, SQL: TStrings);
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procedure GenerateModifySQL(TableName: string; QuotedStrings: boolean; FieldNames,SQL: TStrings);
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procedure GenerateDeleteSQL(TableName: string; QuotedStrings: boolean; SQL: TStrings);
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procedure TestSQL(SQL: string);
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end;
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implementation
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uses IB, Dialogs;
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{ TIBSystemTables }
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const
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sqlGETTABLES = 'Select Trim(RDB$RELATION_NAME) as TableName From RDB$RELATIONS ' +
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'Where RDB$SYSTEM_FLAG = 0 ' +
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'Order by 1';
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sqlGETFIELDS = 'Select Trim(RDB$FIELD_NAME) as ColumnName FROM RDB$RELATION_FIELDS ' +
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'Where RDB$RELATION_NAME = :TableName ' +
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'order by RDB$FIELD_POSITION asc ';
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sqlGETPRIMARYKEYS = 'Select Trim(S.RDB$FIELD_NAME) as ColumnName From '+
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'(Select RDB$INDEX_NAME,RDB$FIELD_NAME FROM RDB$INDEX_SEGMENTS Order by RDB$FIELD_POSITION ASC) S ' +
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'JOIN RDB$RELATION_CONSTRAINTS C On C.RDB$INDEX_NAME = S.RDB$INDEX_NAME ' +
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'Where C.RDB$CONSTRAINT_TYPE = ''PRIMARY KEY'' and RDB$RELATION_NAME = :TableName';
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sqlUPDATEFIELDS = 'Select Trim(RDB$FIELD_NAME) as ColumnName FROM RDB$RELATION_FIELDS RF ' +
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'Where RF.RDB$RELATION_NAME = :TableName and RDB$FIELD_NAME not in ' +
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'(Select RDB$FIELD_NAME FROM RDB$INDEX_SEGMENTS S JOIN RDB$RELATION_CONSTRAINTS C On C.RDB$INDEX_NAME = S.RDB$INDEX_NAME '+
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'Where C.RDB$CONSTRAINT_TYPE = ''PRIMARY KEY'' and C.RDB$RELATION_NAME = RF.RDB$RELATION_NAME)' +
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'order by 1 asc ';
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sqlGETGENERATORNAMES = 'Select RDB$GENERATOR_NAME FROM RDB$GENERATORS '+
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'Where RDB$SYSTEM_FLAG = 0 '+
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'Order by 1 asc';
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function TIBSystemTables.GetSQLType(SQLType: TIBSQLTypes): string;
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begin
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case SQLType of
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SQLUnknown: Result := 'Unknown';
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SQLSelect: Result := 'Select';
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SQLInsert: Result := 'Insert';
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SQLUpdate: Result := 'Update';
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SQLDelete: Result := 'Delete';
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SQLDDL: Result := 'DDL';
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SQLGetSegment: Result := 'GetSegment';
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SQLPutSegment: Result := 'PutSegment';
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SQLExecProcedure: Result := 'Execute Procedure';
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SQLStartTransaction: Result := 'StartTransaction';
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SQLCommit: Result := 'Commit';
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SQLRollback: Result := 'Rollback';
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SQLSelectForUpdate: Result := 'Select for Update';
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SQLSetGenerator: Result := 'Set Generator';
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end;
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end;
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procedure TIBSystemTables.AddWhereClause(TableName: string;
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QuotedStrings: boolean; SQL: TStrings);
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var WhereClause: string;
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Separator: string;
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Count: integer;
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begin
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if not assigned(FGetPrimaryKeys.Database) or not FGetPrimaryKeys.Database.Connected or
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not assigned(FGetPrimaryKeys.Transaction) then
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Exit;
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Count := 0;
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WhereClause := 'Where';
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Separator := ' A.';
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FGetPrimaryKeys.Prepare;
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FGetPrimaryKeys.ParamByName('TableName').AsString := TableName;
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FGetPrimaryKeys.ExecQuery;
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try
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while not FGetPrimaryKeys.EOF do
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begin
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Inc(Count);
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if QuotedStrings then
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WhereClause := WhereClause + Separator + '"' + FGetPrimaryKeys.FieldByName('ColumnName').AsString + '" = :' + FGetPrimaryKeys.FieldByName('ColumnName').AsString
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else
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WhereClause := WhereClause + Separator + FGetPrimaryKeys.FieldByName('ColumnName').AsString + ' = :' + FGetPrimaryKeys.FieldByName('ColumnName').AsString;
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Separator := ' AND A.';
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FGetPrimaryKeys.Next
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end;
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finally
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FGetPrimaryKeys.Close
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end;
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if Count > 0 then
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SQL.Add(WhereClause)
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end;
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constructor TIBSystemTables.Create;
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begin
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FGetTableNames := TIBSQL.Create(nil);
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FGetFieldNames := TIBSQL.Create(nil);
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FGetPrimaryKeys := TIBSQL.Create(nil);
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FTestSQL := TIBSQL.Create(nil);
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FTableAndColumnSQL := TIBSQL.Create(nil);
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FGetGeneratorsSQL := TIBSQL.Create(nil);
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end;
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destructor TIBSystemTables.Destroy;
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begin
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if assigned(FGetFieldNames) then FGetFieldNames.Free;
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if assigned(FGetTableNames) then FGetTableNames.Free;
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if assigned(FTestSQL) then FTestSQL.Free;
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if assigned(FGetPrimaryKeys) then FGetPrimaryKeys.Free;
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if assigned(FTableAndColumnSQL) then FTableAndColumnSQL.Free;
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if assigned(FGetGeneratorsSQL) then FGetGeneratorsSQL.Free;
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inherited Destroy;
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end;
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procedure TIBSystemTables.SelectDatabase(Database: TIBDatabase;
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Transaction: TIBTransaction);
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begin
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FGetTableNames.Database := Database;
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FGetTableNames.Transaction := Transaction;
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FGetTableNames.SQL.Text := sqlGETTABLES;
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FGetFieldNames.Database := Database;
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FGetFieldNames.Transaction := Transaction;
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FGetFieldNames.SQL.Text := sqlGETFIELDS;
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FTestSQL.Database := Database;
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FTestSQL.Transaction := Transaction;
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FGetPrimaryKeys.Database := Database;
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FGetPrimaryKeys.Transaction := Transaction;
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FGetPrimaryKeys.SQL.Text := sqlGETPRIMARYKEYS;
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FTableAndColumnSQL.Database := Database;
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FTableAndColumnSQL.Transaction := Transaction;
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FGetGeneratorsSQL.Database := Database;
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FGetGeneratorsSQL.Transaction := Transaction;
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FGetGeneratorsSQL.SQL.Text := sqlGETGENERATORNAMES;
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end;
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procedure TIBSystemTables.GetTableNames(TableNames: TStrings);
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begin
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if not assigned(FGetTableNames.Database) or not FGetTableNames.Database.Connected or
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not assigned(FGetTableNames.Transaction) then
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Exit;
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with FGetTableNames.Transaction do
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if not InTransaction then StartTransaction;
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TableNames.Clear;
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FGetTableNames.ExecQuery;
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try
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while not FGetTableNames.EOF do
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begin
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TableNames.Add(FGetTableNames.FieldByName('TableName').AsString);
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FGetTableNames.Next
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end;
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finally
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FGetTableNames.Close
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end;
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end;
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procedure TIBSystemTables.GetFieldNames(TableName: string; FieldNames: TStrings;
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IncludePrimaryKeys:boolean=true);
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begin
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if not assigned(FGetFieldNames.Database) or not FGetFieldNames.Database.Connected or
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not assigned(FGetFieldNames.Transaction) then
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Exit;
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with FGetFieldNames.Transaction do
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if not InTransaction then StartTransaction;
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FieldNames.Clear;
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if IncludePrimaryKeys then
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FGetFieldNames.SQL.Text := sqlGETFIELDS
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else
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FGetFieldNames.SQL.Text := sqlUPDATEFIELDS;
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FGetFieldNames.Prepare;
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FGetFieldNames.ParamByName('TableName').AsString := TableName;
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FGetFieldNames.ExecQuery;
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try
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while not FGetFieldNames.EOF do
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begin
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FieldNames.Add(FGetFieldNames.FieldByName('ColumnName').AsString);
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FGetFieldNames.Next
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end;
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finally
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FGetFieldNames.Close
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end;
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end;
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procedure TIBSystemTables.GetPrimaryKeys(TableName: string; PrimaryKeys: TStrings);
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begin
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if not assigned(FGetPrimaryKeys.Database) or not FGetPrimaryKeys.Database.Connected or
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not assigned(FGetPrimaryKeys.Transaction) then
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Exit;
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with FGetPrimaryKeys.Transaction do
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if not InTransaction then StartTransaction;
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PrimaryKeys.Clear;
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FGetPrimaryKeys.Prepare;
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FGetPrimaryKeys.ParamByName('TableName').AsString := TableName;
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FGetPrimaryKeys.ExecQuery;
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try
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while not FGetPrimaryKeys.EOF do
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begin
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PrimaryKeys.Add(FGetPrimaryKeys.FieldByName('ColumnName').AsString);
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FGetPrimaryKeys.Next
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end;
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finally
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FGetPrimaryKeys.Close
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end;
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end;
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procedure TIBSystemTables.GetTableAndColumns(SelectSQL: string;
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var FirstTableName: string; Columns: TStrings);
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var I: integer;
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begin
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if not assigned(FTableAndColumnSQL.Database) or not FTableAndColumnSQL.Database.Connected or
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not assigned(FTableAndColumnSQL.Transaction) then
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Exit;
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with FTableAndColumnSQL.Transaction do
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if not InTransaction then StartTransaction;
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FTableAndColumnSQL.SQL.Text := SelectSQL;
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try
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FTableAndColumnSQL.Prepare;
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FirstTableName := strpas(FTableAndColumnSQL.Current.Vars[0].Data^.relname);
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if assigned(Columns) then
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begin
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Columns.Clear;
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for I := 0 to FTableAndColumnSQL.Current.Count - 1 do
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Columns.Add(FTableAndColumnSQL.Current.Vars[I].Name)
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end;
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except on E:EIBError do
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ShowMessage(E.Message);
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end;
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end;
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procedure TIBSystemTables.GetGenerators(GeneratorNames: TStrings);
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begin
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if not assigned(FGetGeneratorsSQL.Database) or not FGetGeneratorsSQL.Database.Connected or
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not assigned(FGetGeneratorsSQL.Transaction) then
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Exit;
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GeneratorNames.Clear;
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with FGetGeneratorsSQL do
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begin
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with Transaction do
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if not InTransaction then StartTransaction;
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ExecQuery;
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try
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while not EOF do
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begin
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GeneratorNames.Add(FieldByName('RDB$GENERATOR_NAME').AsString);
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Next;
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end;
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finally
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279 |
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Close
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end;
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end;
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282 |
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283 |
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end;
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284 |
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285 |
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procedure TIBSystemTables.GenerateSelectSQL(TableName: string; QuotedStrings: boolean; SQL: TStrings);
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var SelectSQL: string;
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Separator : string;
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288 |
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begin
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289 |
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if not assigned(FGetFieldNames.Database) or not FGetFieldNames.Database.Connected or
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290 |
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not assigned(FGetFieldNames.Transaction) then
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291 |
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Exit;
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SelectSQL := 'Select';
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Separator := ' A.';
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FGetFieldNames.SQL.Text := sqlGETFIELDS;
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FGetFieldNames.Prepare;
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FGetFieldNames.ParamByName('TableName').AsString := TableName;
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FGetFieldNames.ExecQuery;
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try
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299 |
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while not FGetFieldNames.EOF do
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300 |
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begin
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301 |
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if QuotedStrings then
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SelectSQL := SelectSQL + Separator + '"' + FGetFieldNames.FieldByName('ColumnName').AsString + '"'
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else
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SelectSQL := SelectSQL + Separator + FGetFieldNames.FieldByName('ColumnName').AsString;
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Separator := ', A.';
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FGetFieldNames.Next
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end;
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308 |
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finally
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FGetFieldNames.Close
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end;
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311 |
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SelectSQL := SelectSQL + ' From ' + TableName + ' A';
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312 |
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SQL.Add(SelectSQL);
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313 |
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end;
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314 |
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315 |
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procedure TIBSystemTables.GenerateRefreshSQL(TableName: string; QuotedStrings: boolean; SQL: TStrings);
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316 |
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begin
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317 |
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GenerateSelectSQL(TableName,QuotedStrings,SQL);
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318 |
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AddWhereClause(TableName,QuotedStrings,SQL)
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end;
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320 |
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321 |
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procedure TIBSystemTables.GenerateInsertSQL(TableName: string;
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322 |
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QuotedStrings: boolean; FieldNames,SQL: TStrings);
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323 |
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var InsertSQL: string;
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324 |
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Separator: string;
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325 |
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I: integer;
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326 |
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begin
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327 |
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SQL.Clear;
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328 |
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InsertSQL := 'Insert Into ' + TableName + '(';
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329 |
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Separator := '';
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330 |
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for I := 0 to FieldNames.Count - 1 do
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331 |
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begin
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332 |
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if QuotedStrings then
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333 |
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InsertSQL := InsertSQL + Separator + '"' + FieldNames[I] + '"'
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334 |
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else
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335 |
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InsertSQL := InsertSQL + Separator + FieldNames[I] ;
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336 |
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Separator := ',';
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337 |
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end;
|
338 |
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InsertSQL := InsertSQL + ')';
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339 |
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SQL.Add(InsertSQL);
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340 |
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InsertSQL := 'Values(';
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341 |
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Separator := ':';
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342 |
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for I := 0 to FieldNames.Count - 1 do
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343 |
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begin
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344 |
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InsertSQL := InsertSQL + Separator + FieldNames[I] ;
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345 |
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Separator := ',:';
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346 |
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end;
|
347 |
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InsertSQL := InsertSQL + ')';
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348 |
|
|
SQL.Add(InsertSQL);
|
349 |
|
|
end;
|
350 |
|
|
|
351 |
|
|
procedure TIBSystemTables.GenerateModifySQL(TableName: string; QuotedStrings: boolean;
|
352 |
|
|
FieldNames,SQL: TStrings);
|
353 |
|
|
var UpdateSQL: string;
|
354 |
|
|
Separator: string;
|
355 |
|
|
I: integer;
|
356 |
|
|
begin
|
357 |
|
|
SQL.Clear;
|
358 |
|
|
Separator := #$0d#$0a' A.';
|
359 |
|
|
UpdateSQL := 'Update ' + TableName + ' A Set ';
|
360 |
|
|
for I := 0 to FieldNames.Count - 1 do
|
361 |
|
|
begin
|
362 |
|
|
if QuotedStrings then
|
363 |
|
|
UpdateSQL := UpdateSQL + Separator + '"' + FieldNames[I] + '" = :' + FieldNames[I]
|
364 |
|
|
else
|
365 |
|
|
UpdateSQL := UpdateSQL + Separator + FieldNames[I] + ' = :' + FieldNames[I];
|
366 |
|
|
Separator := ','#$0d#$0a' A.';
|
367 |
|
|
end;
|
368 |
|
|
SQL.Add(UpdateSQL);
|
369 |
|
|
AddWhereClause(TableName,QuotedStrings,SQL)
|
370 |
|
|
end;
|
371 |
|
|
|
372 |
|
|
procedure TIBSystemTables.GenerateDeleteSQL(TableName: string; QuotedStrings: boolean; SQL: TStrings);
|
373 |
|
|
begin
|
374 |
|
|
SQL.Clear;
|
375 |
|
|
SQL.Add('Delete From ' + TableName + ' A');
|
376 |
|
|
AddWhereClause(TableName,QuotedStrings,SQL)
|
377 |
|
|
end;
|
378 |
|
|
|
379 |
|
|
procedure TIBSystemTables.TestSQL(SQL: string);
|
380 |
|
|
begin
|
381 |
|
|
if not assigned(FTestSQL.Database) or not FTestSQL.Database.Connected or
|
382 |
|
|
not assigned(FTestSQL.Transaction) then
|
383 |
|
|
Exit;
|
384 |
|
|
FTestSQL.SQL.Text := SQL;
|
385 |
|
|
try
|
386 |
|
|
FTestSQL.Prepare;
|
387 |
|
|
ShowMessage('SQL '+ GetSQLType(FTestSQL.SQLType) + ' Statement Looks OK');
|
388 |
|
|
except on E:EIBError do
|
389 |
|
|
ShowMessage(E.Message);
|
390 |
|
|
end;
|
391 |
|
|
end;
|
392 |
|
|
|
393 |
|
|
end.
|
394 |
|
|
|