1.设置初始条件。
private:
addflag:boolean
modiflag:boolean
var:
strSQLCondition,strOrderCondition:string;
（保存按钮）btnsave.enabled := false;
（取消按钮）btncancel.enabled := false;
(添加，删除，更改)按钮 button.enabled := false;
2.设置添加（add）
addflag:=true;
modiflag:=false;
(保存按钮)btnsave.enabled := true;
(取消按钮)btncancel.enabled := true;
3.设置修改(ALTER)
modiflag:=true;
addflag := false;
(保存按钮)btnsave.enabled := true;
(取消按钮)btncancel.enabled := true;
4.设置删除（delete)
if addflag = True then
begin
Application.MessageBox('正处于新增状态,请选择要删除的项目',
'项目设置',mb_OK+MB_ICONinformation);
abort;
end; //新增状态下不予删除
alterflag := true;
addflag := False;
判断删除条件，符合后进行删除。
if dbgrdh1.FieldColumns['项目名称'].DisplayText = '' then
begin
Application.MessageBox('请选择要删除的项目',
'项目设置',mb_OK+MB_ICONinformation);
abort;
end;
if MessageBox(self.Handle,pchar('你确定将'+trim(dbgrdh1.FieldColumns['项目名称'].DisplayText)+' 项目删除吗?'),'提示信息',MB_ICONQUESTION+MB_YESNO)=ID_YES then
begin
str_sql := 'select fl from zd_flzd where flmc = ' + quotedstr(trim(dbgrdh1.FieldColumns['分类名称'].DisplayText));
with qry_alter do
begin
close;
sql.clear;
sql.add(str_sql);
open;
end;
qry_alter.first;
Fl := qry_alter.fieldbyname('fl').asstring;
str_sql := 'delete from zd_gbxx where code = ' + quotedstr(trim(dbgrdh1.FieldColumns['编码'].DisplayText))
+ ' and xm = ' + quotedstr(trim(dbgrdh1.FieldColumns['项目名称'].DisplayText))
+ ' and fl = ' + quotedstr(Fl);
with qry_alter do
begin
close;
sql.clear;
sql.add(str_sql);
execsql;
end;
dxbrbtn34Click(Sender);//查询按钮
5.设置保存按钮（save)
if edt_flmc.text = '' then
begin
Application.MessageBox('分类名称不能为空！已取消。',
'设置',mb_OK+MB_ICONinformation);
abort;
end;
if edt_xm_2.text = '' then
begin
Application.MessageBox('项目名称不能为空！已取消。',
'设置',mb_OK+MB_ICONinformation);
abort;
end;
if (edt_flmc.Text <> '') then
begin
str_sql := 'select fl from zd_flzd where flmc = ' + quotedstr(trim(edt_flmc.text));
with qry_alter do
begin
close;
sql.clear;
sql.add(str_sql);
open;
end;
qry_alter.first;
Fl := qry_alter.fieldbyname('fl').asstring;
str_sql := 'select code,xm from zd_gbxx where code = ' + quotedstr(Trim(edt_code.Text))+ ' and xm= '+ quotedstr(Trim(edt_xm.Text));
with qry_alter do
begin
close;
sql.clear;
sql.add(str_sql);
open;
end;
if qry_alter.RecordCount >= 1 then
begin
Application.MessageBox('该项目已存在！已取消添加。',
'设置',mb_OK+MB_ICONinformation);
abort;
end
else if qry_alter.RecordCount = 0 then
begin
str_sql := 'insert into zd_gbxx(code,Fl,XM,DM,WBX) values(' + QuotedStr(Trim(edt_code.Text))+','
+QuotedStr(fl)+','
+QuotedStr(Trim(edt_XM_2.Text))+','
+QuotedStr(Trim(edt_DM.Text))+','
+QuotedStr(Trim(edt_wbx.Text))
+ ')';
with qry_alter do
begin
Close;
SQL.Clear;
SQL.Add(str_sql);
ExecSQL;
end;
end;
dxbrbtn34Click(Sender);
////////////////////////////////////////////
if alterflag = True then
begin
if edt_flmc.text = '' then
begin
Application.MessageBox('分类名称不能为空！已取消。',
'设置',mb_OK+MB_ICONinformation);
abort;
end;
if edt_xm_2.text = '' then
begin
Application.MessageBox('项目名称不能为空！已取消。',
'设置',mb_OK+MB_ICONinformation);
abort;
end;
if (edt_flmc.Text <> '') then
begin
str_sql := 'select fl from zd_flzd where flmc = ' + quotedstr(trim(edt_flmc.text));
with qry_alter do
begin
close;
sql.clear;
sql.add(str_sql);
open;
end;
qry_alter.first;
Fl := qry_alter.fieldbyname('fl').asstring;
str_sql := 'update zd_gbxx set code = '
+ quotedstr(Trim(edt_code.Text))
+ ' where fl = ' + quotedstr(fl)
+ ' and xm = ' + quotedstr(trim(dbgrdh1.FieldColumns['项目名称'].DisplayText))
+ ' and DM = ' + QuotedStr(Trim(dbgrdh1.FieldColumns['拼音代码'].DisplayText));
with qry_alter do
begin
close;
sql.clear;
sql.add(str_sql);
execsql;
end;
dxbrbtn34Click(Sender);
end;
end;
6.设置取消按钮。
addflag := false;
alterflag := False;
edt_code.Text := '';
edt_DM.Text := '';
edt_XM_2.Text := '';
edt_flmc.Text := '';
edt_wbx.Text := '';
7.另一种添加，更改，删除的方法。利用parameters.parambyname('').value := ..
with adoquery do
begin
close;
sql.Clear;
sql.Add('insert into gzyb (姓名,职务) values(:xm,:zw)');
Parameters.ParamByName('xm').Value:=trim(xmedit.Text);
Parameters.ParamByName('zw').Value:=trim(zwedit.Text);
execsql;
showmessage('添加成功!');
xmedit.Text:='';
zwedit.Text:='';
end;
////////////////////////////////////////////////////////////////////////
try
with adoquery do
begin
close;
sql.Clear;
sql.Add('delete from gzyb where 姓名=:xm');
Parameters.ParamByName('xm').Value:=trim(xmedit.Text);
execsql;
showmessage('删除成功!');
xmedit.Text:='';
zwedit.Text:='';
end;
except
showmessage('删除失败!');
end;
///////////////////////////////////////////////////////////////////
try
with adoquery do
begin
close;
sql.Clear;
sql.Add('update gzyb set 职务=:zw where 姓名=:xm');
Parameters.ParamByName('xm').Value:=trim(xmedit.Text);
Parameters.ParamByName('zw').Value:=trim(zwedit.Text);
execsql;
showmessage('修改成功!');
xmedit.Text:='';
zwedit.Text:='';
end;
except
showmessage('修改失败!');
end;
本文转自鹅倌51CTO博客，原文链接： http://blog.51cto.com/kaixinbuliao/955993，如需转载请自行联系原作者
