mpquery.~pas

这也是师兄的毕业设计,具体的功能我也不清楚,因为我才大一,请见谅!!!!!!!不过是可以用来答辩的,完整的毕业设计,有源代码,可爱执行文件,文档资料.

unit mpquery;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, querytem, Menus, StdCtrls, ExtCtrls, ComCtrls, LabelButton,
  TradeImage, ToolWin, Buttons;

type
  Tf_mpquery = class(Tquerytemplate)
    CBE_Field: TComboBoxEx;
    SpeedButton1: TSpeedButton;
    procedure tiNewClick(Sender: TObject);
    procedure mmqueryClick(Sender: TObject);
    procedure Image1Click(Sender: TObject);
    procedure SpeedButton1Click(Sender: TObject);
    procedure CBE_FieldChange(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  f_mpquery: Tf_mpquery;

implementation

uses datamodule, Date;

{$R *.dfm}

procedure Tf_mpquery.tiNewClick(Sender: TObject);
var    {*****增加按钮单击事件*****}
    SQL:TListItem;
begin
inherited;
    if (CBE_Field.Text='')or(CB_Cond.Text='')or(edit1.Text='')  then
      begin
      ShowMessage('查找字段、查找条件或查找值不能为空');
      edit1.SetFocus;  //焦点在查找值输入框
      exit;              //退出此过程
      end;
    SQL := LV_SQL.Items.Add;     //增加一条查找字段、查找条件和查找值到ListView内
    if (LV_SQL.Items.Count>1) then
      begin
      if (RG_Cond.ItemIndex=1) then
        SQL.Caption := '或者'      //增加查找逻辑关系值
      else
        SQL.Caption := '并且';
      end;
    SQL.SubItems.Add(CBE_Field.Text); //追加查找字段
    SQL.SubItems.Add(CB_Cond.Text);   //追加查找条件
    SQL.SubItems.Add(edit1.Text);   //追加查找值
     SB_Del.Enabled:=true;
end;

procedure Tf_mpquery.mmqueryClick(Sender: TObject);
var         {*****查找按钮单击事件*****}
    No,i:integer;
    str,buf1,buf2:AnsiString;
begin
inherited;
 with DM.Q_MPlan do  //设置默认前缀
      begin
      if(checkbox1.Checked=true)then
    begin
    if (LV_SQL.Items.Count=0) then
      begin
      ShowMessage('你还没有选择数据记录查找条件，请选择');
      edit1.SetFocus;  //焦点在查找值输入框
      exit;
      end;
    Close;  //关闭数据集
   SQL.Clear;   //清除SQL语句
    No := LV_SQL.Items.Count; //获得当前ListView对象中的记录条数
    for i:=0 to No-1 do         //以下所有语句都用来进行转换用户选择查找条件为SQL语句
      begin
      if (i>=1)then                    //第二条记录开始需要添加查找逻辑
        begin
        buf1 := LV_SQL.Items.Item[i].Caption;  //通过判断添加对应的逻辑条件
        if (buf1 = '并且') then
          str := str+' AND '
        else
          str := str+' OR ';
        end;
           buf1 := LV_SQL.Items.Item[i].SubItems.Strings[0];  //通过查找字段判断添加对应SQL语句
          if (buf1 = '产品编号') then
        str := str+'Produce_ID'
        else if (buf1 = '产品名称') then
          str := str+'Produce_Name'
          else if (buf1 = '每周出产量') then
            str := str+'Produce_WeekYield'
            else if (buf1 = '总出产量') then
              str := str+'Produce_Amount'
              else if (buf1 = '出产时间') then
                str := str+'Produce_Time';
      buf2 := LV_SQL.Items.Item[i].SubItems.Strings[1];  //通过查找条件判断添加对应SQL语句
       str := str+' like ';
      buf2 := LV_SQL.Items.Item[i].SubItems.Strings[2];
       if(buf1 = '产品编号') then
        str := str+''''+'%'+buf2+'%'+''''
        else if (buf1 = '产品名称') then    //字符串类型字段
          str := str+''''+'%'+buf2+'%'+''''         //字符串字段两边需要加上'标志
          else if (buf1 = '每周出产量') then  //整数类型字段
            str := str+''''+'%'+buf2+'%'+''''
            else if (buf1 = '总出产量') then //字符串类型字段
              str := str+''''+'%'+buf2+'%'+''''      //字符串字段两边需要加上'标志
              else if (buf1 = '出产时间') then
               str := str+''''+'%'+buf2+'%'+'''';    //字段两边也需要加上'标志
    end;
     end
    else if (checkbox1.checked=false) then
   begin
    if (LV_SQL.Items.Count=0) then
      begin
      ShowMessage('你还没有选择数据记录查找条件，请选择');
      edit1.SetFocus;  //焦点在查找值输入框
      exit;
      end;
    DM.Q_MPlan.Close;  //关闭数据集
    DM.Q_MPlan.SQL.Clear;   //清除SQL语句
    No := LV_SQL.Items.Count; //获得当前ListView对象中的记录条数
    for i:=0 to No-1 do         //以下所有语句都用来进行转换用户选择查找条件为SQL语句
      begin
      if (i>=1)then                    //第二条记录开始需要添加查找逻辑
        begin
        buf1 := LV_SQL.Items.Item[i].Caption;  //通过判断添加对应的逻辑条件
        if (buf1 = '并且') then
          str := str+' AND '
        else
          str := str+' OR ';
        end;
      buf1 := LV_SQL.Items.Item[i].SubItems.Strings[0];  //通过查找字段判断添加对应SQL语句
      if (buf1 = '产品编号') then
        str := str+'Produce_ID'
        else if (buf1 = '产品名称') then
          str := str+'Produce_Name'
          else if (buf1 = '每周出产量') then
            str := str+'Produce_WeekYield'
            else if (buf1 = '总出产量') then
              str := str+'Produce_Amount'
              else if (buf1 = '出产时间') then
                str := str+'Produce_Time';
      buf2 := LV_SQL.Items.Item[i].SubItems.Strings[1];  //通过查找条件判断添加对应SQL语句
       if (buf2 = '等于') then
        str := str+'='
        else if (buf2 = '不等于') then
          str := str+'<>'
          else if (buf2 = '大于等于') then
            str := str+'>='
            else if (buf2 = '小于等于') then
              str := str+'<=';
      buf2 := LV_SQL.Items.Item[i].SubItems.Strings[2];  //通过查找值判断添加对应SQL语句
      if(buf1 = '产品编号') then
          //str := str+''''+'%'+buf2+'%'+''''
        str := str+''''+buf2+''''
        else if (buf1 = '产品名称') then    //字符串类型字段
            //str := str+''''+'%'+buf2+'%'+''''
          str := str+''''+buf2+''''         //字符串字段两边需要加上'标志
          else if (buf1 = '每周出产量') then  //整数类型字段
              //str := str+''''+'%'+buf2+'%'+''''
            str := str+buf2
            else if (buf1 = '总出产量') then //字符串类型字段
                //str := str+''''+'%'+buf2+'%'+''''
              str := str+buf2        //字符串字段两边需要加上'标志
              else if (buf1 = '出产时间') then
                  str := str+''''+buf2+'''';
                  //str := str+''''+'%'+buf2+'%'+'''';
      end;
      end;

      begin
      SQL.Add('SELECT * FROM MPlan WHERE ');  //添加查询语句
      SQL.Add(str); //添加查询条件语句
      Open; //执行SQL语句，打开数据集
      if recordcount=0 then
      Messagedlg('没有找到你所需要的记录！',mtInformation,[mbOK],0)
      else
      f_mpquery.Close;        //关闭数据记录查询窗口
     end;
end;
end;


procedure Tf_mpquery.Image1Click(Sender: TObject);
begin
  inherited;
with dm.q_mplan do
begin
close;
sql.clear;
sql.add('select * from mplan');
//prepare;
open;
f_mpquery.close;
end
end;

procedure Tf_mpquery.SpeedButton1Click(Sender: TObject);
begin
  inherited;
 F_Date.ShowModal;   //弹出日期选择窗口
    if F_Date.ModalResult = mrOk then  //用户确定选择的日期
   edit1.Text := DateToStr(F_Date.MC.Date); //选择的日期赋字段值字段
end;

procedure Tf_mpquery.CBE_FieldChange(Sender: TObject);
begin
  inherited;
if(cbe_field.Text='出产时间') then
begin
speedbutton1.Enabled:=true;
checkbox1.Enabled:=false;
checkbox1.Checked:=false;
end
else checkbox1.Enabled:=true;

end;

end.