C++Builder中的一些公共函数
//C++Builder中的一些公共函数
//根据SQL语句返回记录集
int __fastcall TGlobalFun::GetRecordCount(AnsiString sql)
{
int ret=0;
ptquery->Active = false;
ptquery->SQL->Text = sql;
try
{
ptquery->Open();
ret= ptquery->RecordCount;
}catch (Exception &e)
{
Application->ShowException(&e);
ret = 0;
}
ptquery->Active = false;
return ret;
}
//将表中的数据填充到下拉列表框中
void __fastcall TGlobalFun::FillComBox(TComboBox *cmb,AnsiString tableName,AnsiString colName)
{
if(tableName == "" || colName == "") return;
AnsiString sql;
sql = "select distinct "+colName+" as col from "+tableName;
ptquery->Active = false;
ptquery->SQL->Text = sql;
ptquery->Open();
if(ptquery->RecordCount<1) return;
//Ìî³ä
cmb->Clear();
cmb->Items->Add("");
ptquery->RecNo = 1;
do
{
if(ptquery->FieldByName("col")->AsString != "")
cmb->Items->Add(ptquery->FieldByName("col")->AsString);
ptquery->Next();
}
while(!ptquery->Eof);
ptquery->Active = false;
return;
}
//应用举例
//调用全局函数FillComBox：cmbSafeItem为下拉列表框的name , P_Safety为表名，SafeItem / /为列名
g_Global.FillComBox(cmbSafeItem,"P_Safety","SafeItem");
对于下拉列表框还有个属性stytle:设置下拉列表的样式，比如只能选择等
//检查数据的合法性：
//控制txtCarId控件只能输入数字和退格 需要引进#include <Qt.hpp>头文件
void __fastcall TFrm_Permit::txtCarIdKeyPress(TObject *Sender, char &Key)
{
if(( Key >= Key_0)&&(Key <= Key_9) || (Key =='\b'))
{
}
else
{
Key = Key_Escape;
}
}
//控制txtBuyMoney控件只能输入数字和退格和小数点
void __fastcall TFrm_Permit::txtBuyMoneyKeyPress(TObject *Sender,
char &Key)
{
if (( Key >= Key_0)&&(Key <= Key_9) || (Key == '.') ||(Key =='\b' ))
{
}
else
{
Key = Key_Escape;
}
}
//函数CheckEmpty
bool __fastcall TGlobalFun::CheckEmpty(TWinControl *com,AnsiString str,const int param)
{
bool ret=true;
AnsiString value="";
int len=0;
//获取控件中要检验的值
if(AnsiString(com->ClassName())== "TEdit")
{
TEdit *pt = (TEdit *)com;
value = pt->Text;
len = pt->MaxLength/2;
} else
if(AnsiString(com->ClassName())== "TComboBox")
{
TComboBox *cb = (TComboBox *)com;
value = cb->Text;
len = cb->MaxLength/2;
}
//检查是否为空
if ((param & _EMPTY) == 0x01){
if(value == "")
{
MessageBox(NULL,(str+"不能为空!").c_str(),"提示",MB_OK|MB_ICONERROR);
if(AnsiString(com->Parent->ClassName()) != "TForm")
com->Parent->Show();
com->SetFocus();
return false;
}
}
if(value == "") return true;
//检查是否是数字
if ((param & _NUM) == 0x02)
{
try{
StrToInt(value);
}catch(...)
{
MessageBox(NULL,(str+"请用数字输入!").c_str(),"提示",MB_OK|MB_ICONERROR);
if(AnsiString(com->Parent->ClassName()) != "TForm")
com->Parent->Show();
com->SetFocus();
return false;
}
}
//检查是否float类型
if ((param & _FLOAT) == 0x04)
{
try{
StrToFloat(value);
}catch(...)
{
MessageBox(NULL,(str+"输入不正确!").c_str(),"提示",MB_OK|MB_ICONERROR);
if(AnsiString(com->Parent->ClassName()) != "TForm")
com->Parent->Show();
com->SetFocus();
return false;
}
}
//检查数据是否为Date类型
if ((param & _DATE) == 0x08)
{
try{
StrToDate(value);
}catch(...)
{
MessageBox(NULL,(str+"请用正确的日期格式输入!").c_str(),"提示",MB_OK|MB_ICONERROR);
if(AnsiString(com->Parent->ClassName()) != "TForm")
com->Parent->Show();
com->SetFocus();
return false;
}
}
//检查长度是否合法，根据控件的maxlength
if ((param & _LENGTH) == 0x10)
{
if(WideString(value).Length() > len)
{
MessageBox(NULL,(str+"输入长度不合法!").c_str(),"提示",MB_OK|MB_ICONERROR);
if(AnsiString(com->Parent->ClassName()) != "TForm")
com->Parent->Show();
com->SetFocus();
return false;
}
}
return ret;
}
//应用举例
if(g_Global.CheckEmpty(txtItemMoney,"±£ÏÕ½ð¶î",_EMPTY)==false) return;
if(g_Global.CheckEmpty(txtBeginTime,"ÆðʼÈÕÆÚ",_DATE)==false) return;
//获得TableName表中FieldsName字段的新编号
int __fastcall TGlobalFun::GetNewID(AnsiString TableName,AnsiString FieldsName)
{
AnsiString strSQL;
int mNewID = 0,mID;
strSQL = "select " + FieldsName + " from " + TableName +" where DepID = '" + g_Global.g_SysInfor.DepID + "' order by " + FieldsName + " Asc";
ptquery->Active = false;
ptquery->SQL->Text = strSQL;
try
{
ptquery->Open();
if(ptquery->RecordCount>0)
{
ptquery->RecNo = 1;
mNewID = 0;
do
{
mID = ptquery->FieldByName(FieldsName)->AsInteger;
if (mNewID != mID)
break;
mNewID++;
ptquery->Next();
}
while(!ptquery->Eof);
}
}
catch(...)
{;}
ptquery->Active = false;
return mNewID;
}
