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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Sql.Database.Physical.Postgresql;
interface
uses
Boolean,
Integer,
Sql.Connection.Settings,
Sql.Database,
Sql.Database.Physical.Default,
Sql.Database.Physical.Postgresql.Api,
Sql.Database.PreparedStatement,
Sql.Result,
Sql.Statement,
Text;
type
TPostgresql = class(TDefaultPhysicalSqlDatabase)
private
Dll: TPostgresqlDll;
Connection: PPGConn;
protected
function GetCouldConnect(): TBoolean; override;
procedure ExecuteStartTransaction(); override;
procedure ExecuteCommitTransaction(); override;
procedure ExecuteRollbackTransaction(); override;
function CompileSql(Statement: TSqlStatement): TText;
function EscapeConnectValue(const Value: TText): TText;
function ConnectKeyValuePair(const Key: TText; const Value: TText): TText;
public
constructor Create(Dll: TPostgresqlDll; ConnectionSettings: TSqlConnectionSettings); reintroduce; virtual;
destructor Destroy(); override;
function Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod = sqrmStoreResult): TSqlResult; override;
function Prepare(Statement: TSqlStatement): TSqlPreparedStatement; override;
function ConnectionIdentifier(): TInteger; override;
function InsertId(): TInteger; override;
function NumberOfAffectedRows(): TInteger; override;
function IsAlive(): TBoolean; override;
function UserExists(const Name: TText): TBoolean; override;
function GetSystemInformation(): TObject; override;
function Embellish(): TSqlDatabase; override;
end;
implementation
uses
Character,
Character.Encoding,
Exception,
Integer._32,
Integer._32.TextFormat,
Sql,
Sql.Database.Logical.Compatibility,
Sql.Database.Physical.Postgresql.Compiler,
Sql.Database.Physical.Postgresql.Result,
Sql.Database.Physical.Postgresql.Schema.System,
Sql.Database.Physical.Postgresql.SystemInformation,
Sql.Exception,
Windows.Api.Kernel.DateTime;
{ TPostgresql }
function TPostgresql.CompileSql(Statement: TSqlStatement): TText;
var
Compiler: TPostgresqlCompiler;
begin
Statement.AddReference();
Compiler := TPostgresqlCompiler.Create();
Result := Compiler.Compile(TCharacterEncoding.Windows1252, Statement); // TODO: Verify encoding
Compiler.Free();
Statement.ReleaseReference();
end;
function TPostgresql.ConnectionIdentifier(): TInteger;
begin
Result := Dll.backendPID(Connection);
end;
function TPostgresql.ConnectKeyValuePair(const Key, Value: TText): TText;
begin
Result := Key + '=''' + EscapeConnectValue(Value) + '''';
end;
constructor TPostgresql.Create(Dll: TPostgresqlDll; ConnectionSettings: TSqlConnectionSettings);
begin
inherited Create(ConnectionSettings);
Self.Dll := Dll;
if ConnectionSettings.Port = 0 then
ConnectionSettings.Port := POSTGRESQL_PORT;
if Dll.IsLoaded then
Connection := Dll.connectdb(
ConnectKeyValuePair('host', ConnectionSettings.Server) +
' ' + ConnectKeyValuePair('user', ConnectionSettings.UserName) +
' ' + ConnectKeyValuePair('password', ConnectionSettings.Password) +
' ' + ConnectKeyValuePair('dbname', ConnectionSettings.DatabaseName) +
' ' + ConnectKeyValuePair('port', Integer32ToText(ConnectionSettings.Port))
);
end;
destructor TPostgresql.Destroy();
begin
if Dll.IsLoaded then
Dll.finish(Connection);
inherited Destroy();
end;
function TPostgresql.Embellish(): TSqlDatabase;
begin
Result := TCompatibilitySqlDatabase.Create(Self, True);
end;
function TPostgresql.EscapeConnectValue(const Value: TText): TText;
var
i: TInteger32;
c: TCharacter;
begin
Result := '';
for i := 0 to Value.Count - 1 do
begin
c := Value[i];
if c in ['''', '\'] then
Result := Result + '\' + c
else
Result := Result + c;
end;
end;
procedure TPostgresql.ExecuteCommitTransaction();
begin
Dll.exec(Connection, 'COMMIT');
end;
procedure TPostgresql.ExecuteRollbackTransaction();
begin
Dll.exec(Connection, 'ROLLBACK');
end;
procedure TPostgresql.ExecuteStartTransaction();
begin
Dll.exec(Connection, 'BEGIN');
end;
function TPostgresql.GetCouldConnect(): TBoolean;
begin
Result := Dll.IsLoaded and (Dll.status(Connection) = CONNECTION_OK);
end;
function TPostgresql.GetSystemInformation(): TObject;
begin
Result := TPostgresqlSystemInformation.Instance;
end;
function TPostgresql.InsertId(): TInteger;
begin
Result := SelectInteger(SelectLastInsertId());
end;
function TPostgresql.IsAlive(): TBoolean;
begin
Result := Dll.status(Connection) = CONNECTION_OK;
end;
function TPostgresql.NumberOfAffectedRows(): TInteger;
begin
raise EException.Create('Not implemented');
end;
function TPostgresql.Prepare(Statement: TSqlStatement): TSqlPreparedStatement;
begin
raise EException.Create('Not implemented');
end;
function TPostgresql.Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
var
PGResult: PPGResult;
CompiledSql: TText;
Status: TExecStatusType;
begin
CompiledSql := CompileSql(Statement);
PGResult := Dll.exec(Connection, CompiledSql);
Status := Dll.resultStatus(PGResult);
if Status = PGRES_TUPLES_OK then
Result := TPostgresqlResult.Create(Dll, PGResult)
else if Status = PGRES_COMMAND_OK then
begin
Result := nil;
Dll.clear(PGResult);
end
else
raise ESqlQuery.Create(CompiledSql, Dll.resultErrorMessage(PGResult));
TickCountLastQuery := GetTickCount();
end;
function TPostgresql.UserExists(const Name: TText): TBoolean;
var
UserTable: TPostgresqlUserTable;
begin
UserTable := TPostgresqlSystemSchema.Instance.UserTable;
Result := Exists(Select([ UserTable.Name ], [ UserTable ], [ UserTable.Name = Name ]));
end;
end.
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