dbfunc.pas

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/// <author>cxg 2020-9-29</author>   unit dbfunc;   interface   uses   Classes, uunidacpool, serial, uunidac, ulog, SysUtils;   function query(const params: RawByteString): RawByteString;   function save(const params: RawByteString): RawByteString;   function execsql(const params: RawByteString): RawByteString;   function execsp(const params: RawByteString): RawByteString;   implementation   function query(const params: RawByteString): RawByteString; var   pool: tunidacpool;   dm: Tunidac;   requ, resp: TSerial;   accountno, sql: string;   tablenum, i: integer; begin   dm := nil;   pool := nil;   requ := TSerial.Create;   resp := TSerial.Create;   try     try       requ.loadFromRawByteString(params);       accountno := requ.force('accountno').AsString;       tablenum := requ.force('tablenum').AsInteger;       pool := GetDBPool(accountno);       dm := pool.Lock;       dm.dsp.DataSet := dm.qry;       for i := 1 to tablenum do       begin         sql := requ.force('sql'+inttostr(i)).AsString ;         dm.qry.Close;         dm.qry.sql.Clear;         dm.qry.sql.Add(sql);         resp.force('dataset' + inttostr(i)).AsVariant := dm.dsp.Data;       end;       dm.dsp.DataSet := nil;       resp.force('return').AsBoolean := True;       Result := resp.saveToRawByteString;     except       on e: Exception do       begin         resp.force('return').AsBoolean := False;         resp.force('err').AsString := e.Message;         Result := resp.saveToRawByteString;         Log.WriteLog('dbfunc.query ' + e.Message);       end;     end;   finally     pool.unlock(dm);     requ.Free;     resp.Free;   end; end;   function save(const params: RawByteString): RawByteString; var   pool: tunidacpool;   dm: Tunidac;   requ, resp: TSerial;   accountno, tablename, nosavefields: string;   tablenum, i, err: integer;   delta: OleVariant; begin   pool := nil;   dm := nil;   requ := TSerial.Create;   resp := TSerial.Create;   try     try       requ.loadFromRawByteString(params);       tablenum := requ.force('tablenum').AsInteger;       accountno := requ.force('accountno').AsString;       pool := GetDBPool(accountno);       dm := pool.Lock;       dm.dsp.DataSet := dm.qry;       if not dm.conn.InTransaction then         dm.conn.StartTransaction; // 开启事务       for i := 1 to tablenum do       begin         tablename := requ.force('tablename' + IntToStr(i)).AsString;         nosavefields := requ.force('nosavefields' + IntToStr(i)).AsString;  //不要提交的字段 例：字段一,字段二         dm.qry.Close;         dm.qry.sql.Clear;         dm.qry.sql.Add('select * from ' + tablename + ' where 1=2');         delta := requ.force('delta' + IntToStr(i)).AsVariant;         dm.dsp.ApplyUpdates(delta, 0, err);         if err > 0 then         begin           dm.conn.Rollback; // 回滚事务           resp.force('return').AsBoolean := False;           resp.saveToRawByteString;           Exit;                      //有一个表提交失败，就要中止         end;       end;       dm.conn.Commit; // 提交事务       dm.dsp.DataSet := nil;       resp.force('return').AsBoolean := True;       resp.saveToRawByteString;     except       on e: Exception do       begin         resp.force('return').AsBoolean := False;         resp.force('err').AsString := e.Message;         resp.saveToRawByteString;         Log.WriteLog('dbfunc.save ' + e.Message);       end;     end;   finally     requ.Free;     resp.Free;     pool.Unlock(dm);   end; end;   function execsql(const params: RawByteString): RawByteString; var   requ: TSerial;   pool: tunidacpool;   dm: Tunidac;   accountno, sql: string; begin   pool := nil;   dm := nil;   requ := TSerial.Create;   try     try       requ.loadFromRawByteString(params);       accountno := requ.force('accountno').AsString;       sql := requ.force('sql').AsString;       pool := GetDBPool(accountno);       dm := pool.Lock;       if not dm.conn.InTransaction then         dm.conn.StartTransaction;  //开启事务       dm.qry.Close;       dm.qry.sql.Clear;       dm.qry.sql.Add(sql);       dm.qry.Execute;       dm.conn.Commit;   //提交事务       requ.clear;       requ.force('return').AsBoolean := True;       requ.saveToRawByteString;     except       on e: Exception do       begin         dm.conn.Rollback; //回滚事务         requ.clear;         requ.force('return').AsBoolean := False;         requ.saveToRawByteString;         Log.WriteLog('dbfunc.execsql ' + e.Message);       end;     end;   finally     requ.Free;     pool.Unlock(dm);   end; end;   function execsp(const params: RawByteString): RawByteString; var   requ: TSerial;   pool: tunidacpool;   dm: Tunidac;   accountno, spname, lparams: string;   list: tstringlist;   i: Integer; begin   pool := nil;   dm := nil;   requ := TSerial.Create;   list := TStringList.Create;   try     try       requ.loadFromRawByteString(params);       accountno := requ.force('accountno').AsString;       spname := requ.force('spname').AsString;       lparams := requ.force('params').AsString;       pool := GetDBPool(accountno);       dm := pool.Lock;       dm.dsp.DataSet := dm.sp;       dm.sp.Close;       dm.sp.Params.Clear;       dm.sp.StoredProcName := spname;       dm.sp.Prepare;       if lparams > '' then // 不是所有的存储过程都有参数       begin         list.Delimiter := ';';         list.DelimitedText := params;         for i := 0 to list.count - 1 do           dm.sp.FindParam(list.Names[i]).AsString := list.Values[list.Names[i]];       end;       dm.dsp.DataSet := nil;       requ.clear;       requ.force('return').AsBoolean := true;       requ.force('dataset').AsVariant := dm.dsp.Data;       requ.saveToRawByteString;     except       on e: Exception do       begin         requ.force('return').AsBoolean := False;         requ.force('err').AsString := e.Message;         requ.saveToRawByteString;         Log.WriteLog('dbfunc.execsp ' + e.Message);       end;     end;   finally     requ.Free;     list.Free;     pool.Unlock(dm);   end; end;    end.