Delphi ADOQuery处理多条SQL语句
Delphi(Pascal) code
var
sqlStr:String;
begin
sqlStr:= ‘ begin ‘
sqlStr:= sqlStr+ ‘update table1 set col1 = ‘‘test‘‘ where 1=2;‘;
sqlStr:= sqlStr+ ‘update table1 set col1 = ‘‘test2‘‘ where 1=2;‘;
sqlStr:= sqlStr+ ‘ end ‘;
adoquery1.Close;
adoquery1.SQL.Clear;
adoquery1.SQL.Add(sqlStr);
adoquery1.ExecSQL;
end;
把sql语句用begin...end包起來,再提交給DB处理,就OK了!
ADOQuery的批处理方式
比如在一个窗体里有一个“取消”和“确定”按钮,“取消”按钮批次取消所有修改,“确定”按钮批次提交:
1.设置QryDef(数据集)的LockType为ltBatchOptimistic,CursorType为ctStatic,CursorLocation为clUseClient
2.“确定”按钮的单击事件为:
if QryDef.Connection.InTransaction then
begin
try
QryDef.UpdateBatch();
QryDef.Connection.CommitTrans;
except
QryDef.Connection.RollbackTrans;
end;
end;
3.“取消”按钮的单击事件为:
QryDef1.CancelBatch;
4.初始插入数据:
Qry.LoadFromFile(ExtractFilePath(Application.ExeName) + ‘ClassifyDefine‘);
{$IFDEF Test}codesite.SendMsg(‘3‘); {$ENDIF}
while not Qry.Eof do
begin
QryDef.Append;
QryDef.FieldByName(‘name‘).AsString := Qry.FieldByName(‘name‘).AsString;
if not Qry.FieldByName(‘Money1‘).IsNull then
QryDef.FieldByName(‘Money1‘).AsCurrency := Qry.FieldByName(‘Money1‘).AsCurrency;
if not Qry.FieldByName(‘Money2‘).IsNull then
QryDef.FieldByName(‘Money2‘).AsCurrency := Qry.FieldByName(‘Money2‘).AsCurrency;
QryDef.Post;
Qry.Next;
end;
QryDef.UpdateBatch();
5.批处理方式其它实例:
procedure TForm1.Button1Click(Sender: TObject);
begin
adoconnection1.begintrans;
try
adoquery.close;
adoquery.sql.clear;
adoquery.sql.add(insert 语句);
adoquery.execsql;
如果还有insert 语句则:
adoquery.close;
adoquery.sql.clear;
adoquery.sql.add(insert 语句);
adoquery.execsql;直到所有insert 语句完成.
adoconnection1.committrans;
except
adoconnection1.rollbacktrans;
end;
end;
用adoquery取指定字段所有值问题
我要在在DBComboBox里显示出来啊
while not adoquery1.Eof do
begin
ComboBox1.Items.Add(adoquery1.fieldbyname(‘id‘).asstring); //id改为你要指定的字段
adoquery1.Next;
end;
在DBComboBox里显示出来啊
如果是DBComboBox
procedure TForm1.FormCreate(Sender: TObject);
begin
adoquery1.SQL.Add(‘select * from test);
adoquery1.Open;
DBComboBox1.DataField:=‘id‘;
while not adoquery1.Eof do
begin
DBComboBox1.Items.Add(adoquery1.fieldbyname(DBComboBox1.DataField).AsString);
adoquery1.Next;
end;
end;
xxx.sql.text := ‘insert into t_log3(name,czsj,czlog)values(‘‘‘+a +‘‘‘,‘‘‘+ b+‘‘‘,‘‘‘+c+‘‘‘)‘;
或
xxx.sql.text := ‘insert into t_log3(name,czsj,czlog)values(:a1,:b1,:c1)‘;
xxx.parameters.parambyname(‘a1‘).values := a;
xxx.parameters.parambyname(‘b1‘).values := b;
xxx.parameters.parambyname(‘c1‘).values := c;
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