怎样在delphi里嵌入sql语句

Question

主要是查询语句，面板上有几个输入条，根据输入条里的输入条件来查询sql server，最好能给点example

Answer 1

with query do
begin
close;
sql.clear;
sql.add('select * from Table')
sql.add('where condition1=:param1 and condition2=:param2 ....');
ParamByName('param1').value := edit1.text;
paramByname('param2').value :=edit2.text;
open;
end;
注意类型转换

Answer 2

将输入条内的字符串赋值给Adoquery的sql，然后将adoquery激活就可以进行查询了呀

Answer 3

Form上的控件：
DataSource1:TDataSource;
DBGrid1:TDBGrid1;
ADOQuery1:TQuery;
Edit1:TEdit;
Button1:TButton;DataSource1.DataSet=ADOQuery1;
DBGrid1.DataSource=DataSource1在Button1的OnClick事件中
ADOQuery1.ConnectionString:='....';//你可以在设计时生成
ADOQuery1.SQL.Add('Select * From mytable Where myField=:mydata');
ADOQuery1.Params.ParambyName('mydata').AsString:=Edit1.Text;
ADOQuery1.Active:=True;

Answer 4

比如说有3个Edit框，要查的表是AA，则用控件Query
语句 ：
with query do
begin
  Close;                //关闭这个Query
  SQL.Clear;            //清空当前的SQL语句
  SQL.Add('select * from AA (nolock)');  //下面是嵌套的SQL语句。
  SQL.Add('where 1=1');                  //默认所有的
  if edit1.text <> '' then               //下面是根据条件筛选
    SQL.Add('and XX = '''+edit1.text+'''');
  if edit2.text <> '' then
    SQL.Add('and XX = '''+edit2.text+'''');
  if edit3.text <> '' then
    SQL.Add('and XX = '''+edit3.text+'''');
  Open;                                  // 运行这个SQL语句。
end;
以上是查询时的语句，如果是删除，修改或插入，则要把Open改为Execsql
其它的语法和上面一样！
只是改成Insert,Update,Delete

Answer 5

我貼！
library FindDll;{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }uses
  ShareMem,
  SysUtils,
  Classes,
  UtFind in 'UtFind.pas' {FindFrm};{$R *.res}
exports
  FindShow;
begin
end.
unit UtFind;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, DB, DBTables, ADODB, Buttons;type
  TFindFrm = class(TForm)
    ComboBox1: TComboBox;
    ComboBox2: TComboBox;
    Edit1: TEdit;
    GroupBox1: TGroupBox;
    RadioButton1: TRadioButton;
    RadioButton2: TRadioButton;
    RichEdit1: TRichEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Query1: TADOQuery;
    ADOConnection1: TADOConnection;
    ListBox1: TListBox;
    SpeedButton1: TSpeedButton;
    SpeedButton2: TSpeedButton;
    ListBox2: TListBox;
    Label1: TLabel;
    RichEdit2: TRichEdit;
    RadioButton3: TRadioButton;
    RadioButton4: TRadioButton;
    procedure Button1Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure ListBox1DblClick(Sender: TObject);
    procedure ListBox2DblClick(Sender: TObject);
    procedure SpeedButton1Click(Sender: TObject);
    procedure SpeedButton2Click(Sender: TObject);
  private
    { Private declarations }
    TBname:string;           //數據庫名稱
    FindSqlString:string;    //返回的查詢字符串
  public
    { Public declarations }
  end;//定義出口函數
function FindShow(H:THandle;TName:string):string;stdcall;implementation{$R *.dfm}function FindShow(H:THandle;TName:string):string;
var
  FindFrm: TFindFrm;
begin
  application.Handle:=H;
  FindFrm:=TFindFrm.Create(application);
  try
    FindFrm.Query1.SQL.Clear;
    FindFrm.Query1.SQL.Add(TName);
    FindFrm.ShowModal;
    Result:=FindFrm.FindSqlString;
  finally
    FindFrm.Free;
  end;
end;procedure TFindFrm.Button1Click(Sender: TObject);
var aa,bb :string;
var c:integer;
begin
if RichEdit1.Lines.Text='' then
  aa:=''
else
begin
  if RadioButton1.Checked=True then
    aa:='AND'
  else
    aa:='OR';
end;
c:=Pos(' ',ComboBox1.Text);
RichEdit2.Text:=RichEdit2.Text+' '+aa+' '+'('+copy(ComboBox1.Text,1,c-1)+' '+ComboBox2.Text+' '+''''+Edit1.Text+''')';
RichEdit1.Text:=RichEdit1.Text+' '+aa+' '+'('+copy(ComboBox1.Text,c+1,Length(ComboBox1.Text)-c-1)+' '+ComboBox2.Text+' '+''''+Edit1.Text+''')';
end;
procedure TFindFrm.Button3Click(Sender: TObject);
var i,n:integer;
var OrderStr,ListStr:string;
begin
//把生成的sql語句添加到FindSqlString中
if RichEdit1.Lines.Text<>'' then
  FindSqlString:='SELECT * FROM '+trim(TBname)+' WHERE '+trim(RichEdit2.Text)
else
  FindSqlString:='SELECT * FROM '+trim(TBname);
//加orderby
if ListBox2.Items.Text<>'' then
for i:=0 to ListBox2.Items.Count-1 do
begin
   n:=Pos(' ',ListBox2.Items.Strings[i]);
   ListStr:=copy(ListBox2.Items.Strings[i],1,n-1);
   if i=0 then
     OrderStr:=ListStr
   else
     OrderStr:=OrderStr+','+ListStr;
end;
//加dsc
if OrderStr<>'' then
begin
  if RadioButton3.Checked=True then
    OrderStr:=' ORDER BY '+OrderStr+' ASC'
  else
    OrderStr:=' ORDER BY '+OrderStr+' DESC';
end;
FindSqlString:=FindSqlString+OrderStr;
self.Close;
end;procedure TFindFrm.Button4Click(Sender: TObject);
begin
FindSqlString:='';
self.Close;
end;procedure TFindFrm.FormShow(Sender: TObject);
var i:integer;
var a:Tobject;
begin
TBname:=Query1.SQL.Text;
Query1.SQL.Clear;
Query1.SQL.Add('SELECT MA003,MA004 FROM XADMA WHERE MA001='''+Trim(TBname)+'''');
RichEdit1.Lines.Text:='';
if Query1.Active=False then Query1.Open;
while not Query1.Eof do
begin
  ComboBox1.AddItem(trim(Query1.FieldValues['MA003'])+' '+Query1.FieldValues['MA004'],a);
  ListBox1.AddItem(trim(Query1.FieldValues['MA003'])+' '+Query1.FieldValues['MA004'],a);
  Query1.Next; 
end;
Query1.Close;
ComboBox1.ItemIndex:=0;
end;procedure TFindFrm.Button2Click(Sender: TObject);
begin
RichEdit2.Text:='';
RichEdit1.Text:='';
end;procedure TFindFrm.ListBox1DblClick(Sender: TObject);
var a:Tobject;
begin
if ListBox1.ItemIndex<>-1 then
begin
 ListBox2.AddItem(ListBox1.Items.Strings[ListBox1.ItemIndex],a);
 ListBox1.DeleteSelected;
end;
end;procedure TFindFrm.ListBox2DblClick(Sender: TObject);
var a:Tobject;
begin
if ListBox2.ItemIndex<>-1 then
begin
 ListBox1.AddItem(ListBox1.Items.Strings[ListBox2.ItemIndex],a);
 ListBox2.DeleteSelected;
end;
end;procedure TFindFrm.SpeedButton1Click(Sender: TObject);
begin
  ListBox1DblClick(Sender);
end;procedure TFindFrm.SpeedButton2Click(Sender: TObject);
begin
  ListBox2DblClick(Sender);
end;end.俺這個dll到處都可以用，如果要的話，俺可以給個demo給你