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unit UdrSelectInto;
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{
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create or alter procedure select_into (
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select_statement blob sub_type 1 not null,
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table_name varchar(63) not null,
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table_type varchar(25) not null -- 'global temporary preserve', 'global temporary[ delete]', <empty string> for standard table
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) returns (
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status varchar(100)
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)
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external name 'selectinto!select_into'
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engine udr;
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}
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interface
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uses Classes, SysUtils, IB, FBUDRController, FBUDRIntf;
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type
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TSelectInto = class(TFBUDRExecuteProcedure)
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public
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procedure Execute(context: IFBUDRExternalContext;
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ProcMetadata: IFBUDRProcMetadata;
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InputParams: IFBUDRInputParams;
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OutputData: IFBUDROutputData); override;
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end;
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implementation
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uses StrUtils, IBUtils;
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function SQLType2Name(SQLType: Cardinal) : AnsiString;
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begin
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case SQLType of
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SQL_VARYING: Result := 'VARCHAR';
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SQL_TEXT: Result := 'CHAR';
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SQL_DOUBLE: Result := 'DOUBLE PRECISION';
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SQL_FLOAT: Result := 'FLOAT';
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SQL_LONG: Result := 'INTEGER';
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SQL_SHORT: Result := 'SMALLINT';
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SQL_TIMESTAMP: Result := 'TIMESTAMP';
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SQL_TIMESTAMP_TZ: Result := 'TIMESTAMP WITH TIMEZONE';
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SQL_TIMESTAMP_TZ_EX: Result := 'TIMESTAMP WITH TIMEZONE';
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SQL_BLOB: Result := 'BLOB';
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SQL_D_FLOAT: Result := 'FLOAT';
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SQL_TYPE_TIME: Result := 'TIME';
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SQL_TYPE_DATE: Result := 'DATE';
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SQL_INT64: Result := 'BIGINT';
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SQL_TIME_TZ: Result := 'TIME WITH TIMEZONE';
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SQL_TIME_TZ_EX: Result := 'TIME WITH TIMEZONE';
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SQL_DEC16: Result := 'DECFLOAT(16)';
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SQL_DEC34: Result := 'DECFLOAT(34)';
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SQL_INT128: Result := 'INT128';
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SQL_NULL: Result := 'VARCHAR(1)';
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SQL_BOOLEAN: Result := 'BOOLEAN';
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else
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Result := 'UNKNOWN';
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end
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end;
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function Fld2SQLTypeDef(SQLType: Cardinal; SubType: Integer; Size: Cardinal; Scale: Integer; CharSetClause: String) : AnsiString;
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var
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TypeDef: AnsiString;
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begin
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TypeDef := SQLType2Name(SQLType);
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if Scale < 0 then
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case SQLType of
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SQL_SHORT: TypeDef := format('NUMERIC(4,%d)', [-Scale]);
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SQL_LONG: TypeDef := format('NUMERIC(9,%d)', [-Scale]);
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SQL_DOUBLE: TypeDef := format('NUMERIC(15,%d)', [-Scale]);
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SQL_INT64: TypeDef := format('NUMERIC(18,%d)', [-Scale]);
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SQL_INT128: TypeDef := format('NUMERIC(35,%d)', [-Scale]);
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end
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else
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case SQLType of
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SQL_VARYING,
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SQL_TEXT: TypeDef := format(TypeDef + '(%d) %s', [Size, CharSetClause]);
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SQL_BLOB: TypeDef := format(TypeDef + ' SUB_TYPE %d %s', [SubType, CharSetClause]);
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end;
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Result := TypeDef;
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end;
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procedure TSelectInto.Execute(context: IFBUDRExternalContext; ProcMetadata: IFBUDRProcMetadata; InputParams: IFBUDRInputParams; OutputData: IFBUDROutputData);
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var
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Statement: IStatement;
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TX2: ITransaction;
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Dialect, DefaultCharSetID, i: Integer;
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SelectSQL, TableName, TableType: AnsiString;
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TypeDef, TypeDefs, CharSetClause, Command, CommitAction, SQL: AnsiString;
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begin
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TypeDefs := '';
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with context do
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begin
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// prepare and analyse select_statement and create DDL of target table columns
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SelectSQL := InputParams.ByName('select_statement').AsString;
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Dialect := GetAttachment.GetSQLDialect;
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DefaultCharSetID := context.GetAttachment.getCharSetID;
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CharSetClause := '';
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Statement := GetAttachment.Prepare(GetTransaction, SelectSQL);
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with Statement.MetaData do
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begin
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for i := 0 to Count -1 do
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begin
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with ColMetaData[i] do
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begin
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case GetSQLType of SQL_VARYING,
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SQL_TEXT,
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SQL_BLOB: if (DefaultCharSetID <> getCharSetID) then
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CharSetClause := 'CHARACTER SET ' + GetAttachment.GetCharsetName(getCharSetID);
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end;
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TypeDef := Fld2SQLTypeDef(GetSQLType, SQLSubtype, Size, Scale, CharSetClause);
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TypeDefs := TypeDefs + ','#13#10 + QuoteIdentifierIfNeeded(Dialect, Name) + ' ' + TypeDef;
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end;
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end;
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Delete(TypeDefs, 1, 1);
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end;
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// create target table DDL
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TableName := InputParams.ByName('table_name').AsString;
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TableType := UpperCase(InputParams.ByName('table_type').AsString);
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// default: recreate standard table
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Command := 'RECREATE ';
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// global temporary?
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CommitAction := '';
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if AnsiContainsStr(TableType, 'GLOBAL TEMPORARY') then
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begin
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Command := Command + 'GLOBAL TEMPORARY';
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if AnsiContainsStr(TableType, 'PRESERVE') then
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CommitAction := 'ON COMMIT PRESERVE ROWS';
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end;
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// create target table within own TX, needs to be committed separately
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SQL := SQL + format('%s TABLE %s (%s) %s', [Command, TableName, TypeDefs, CommitAction]);
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TX2 := GetAttachment.StartTransaction([isc_tpb_write, isc_tpb_nowait, isc_tpb_read_committed], taCommit);
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GetAttachment.ExecImmediate(TX2, SQL);
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TX2.Commit();
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// fill target table
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SQL := format('INSERT INTO %s %s;', [TableName, SelectSQL]);
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GetAttachment.ExecImmediate(GetTransaction, SQL);
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end;
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OutputData.ByName('status').AsString := 'ok';
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end;
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initialization
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FBRegisterUDRProcedure('select_into', TSelectInto);
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end.
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