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/*-- 专项技术学习 －数据库访问技术之ODBC API
这个类 通过ODBC API 函数访问ODBC 数据源的数据表
功能简介:能够帮定一个临时指定表,调用类的函数即可对该表
插入、增加、修改、简单统计等等操作(注:通过动态改变表的信息:表名字、
表字段总数、字段名字、字段类型、字段是否为数值、字段是否为主键。这样
就可以访问ODBC 数据源的所有表了)
另外提供一个函数 可以对该数据源的其他表（包括帮定的表）进行
删除、修改功能
LSZ 2001.08.25 */
/*头文件*/
#ifndef _WDC_DATABASE_H
#define _WDC_DATABASE_H
#include <sql.h>
#include <sqlext.h>
#define MAX_FIELDS 500
#define MAX_ERROR_MSG 1024
#define MAX_DATA 500
class CWdcDatabase
{
public:
CWdcDatabase();
virtual ~CWdcDatabase();
BOOL Open(const CString& sDSN,
const CString& sTable,
const CString& sUserId,
const CString& sPassword) ; /*打开一个ODBC数据源数据库*/
public:
BOOL m_bOpen; /*标志数据库是否打开*/
BOOL m_bBrackets; /*标识表名、字段名是否用方扩号扩起来*/
int m_nError; /*ODBC错误返回代码*/
CString m_sQuery; /*操作ODBC 数据源公用的语句，用于方便构造*/
CString m_sErrMsg; /*ODBC错误返回信息*/
CString m_sDSN; /*ODBC 数据源的 DSN*/
CString m_sTable; /*临时绑定的表名*/
public:
void DropHstmtSelect(); /*确保公共查询的语句句柄释放*/
long GetRecordCount(CString &sSel); /*取得符合条件的记录数*/
BOOL NextMatchingRecord(); /*查询符合条件的下一条记录*/
int SelectMatchingRecords(CString& sWhereContext); /*查询符合条件的记录*/
BOOL UpdateRecord(); /*更新临时绑定的表的一条记录*/
BOOL AddRecord(); /*增加临时绑定表一条新记录*/
BOOL DeleteRecord(CString &sWhereDelete); /*删除临时绑定表符合条件记录*/
BOOL Execute(const CString &sText); /*执行一个SQL语句，注:可以执行存储过程*/
void Close(); /*关闭数据库*/
public:
int m_nFields; /*临时绑定表字段的总数*/
CString m_sFieldName[MAX_FIELDS]; /*临时绑定表字段名字*/
CString m_sFieldValue[MAX_FIELDS];/*临时绑定表字段值*/
BOOL m_bKeyField[MAX_FIELDS];/*临时绑定表字段是否为主键*/
BOOL m_bNumeric[MAX_FIELDS];/*临时绑定表字段是否为数值类型*/
private:
CString Quote(CString &sQuote); /*字符串替换*/
RETCODE rc; /*ODBC API 涵数执行返回码*/
HSTMT hstmt, hstmt_select; /*公共语句句柄*/
unsigned char szDSN[200]; /*连接数据源的 DSN */
unsigned char szID[200]; /*连接数据源的 UID */
unsigned char szPassword[200]; /*连接数据源的 PWD*/
unsigned char szQuery[3000]; /*公共执行的语句句柄*/
unsigned char szTemp[1000]; /*公共使用的字符串*/
CString sTemp ; /*公共使用的字符串*/
HENV henv; /*环境句柄*/
HDBC hdbc; /*ODBC 连接句柄*/
};
#endif
/*实现文件*/
#include "stdafx.h"
#include "WdcDatabase.h"
#include <sql.h>
#include <sqlext.h>
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
CWdcDatabase::CWdcDatabase()
{
m_nError = 0;
m_bOpen = false;
m_nFields = 0;
m_bBrackets = false;
}
CWdcDatabase::~CWdcDatabase()
{
if(m_bOpen)
{
Close() ;
}
}
BOOL CWdcDatabase::Open(const CString& sDSN,
const CString& sTable,
const CString& sUserId,
const CString& sPassword)
{
if(m_bOpen)
{
Close() ;
}
hstmt_select = NULL ;
RETCODE rc ;
CString stemp ;
memset(szDSN,0x00,200) ;
memset(szID,0x00,200) ;
memset(szPassword,0x00,200) ;
/*Open Database */
SQLAllocEnv(&henv) ;
SQLAllocConnect(henv,&hdbc) ;
strcpy((char*)szDSN,sDSN) ;
stemp = sUserId ;
strcpy((char*)szID,stemp) ;
stemp = sPassword ;
strcpy((char*)szPassword,stemp) ;
m_sDSN = sDSN ;
m_sTable = sTable ;
rc = SQLConnect(hdbc,
szDSN,
SQL_NTS,
szID,
SQL_NTS,
szPassword,
SQL_NTS);
m_nError = (int) rc ;
if((rc == SQL_SUCCESS ) ||(rc == SQL_SUCCESS_WITH_INFO))
{
m_bOpen = TRUE ;
TRACE0("Open database Succeed !\n") ;
return TRUE ;
}
else
{
m_bOpen = FALSE ;
TRACE0("Open Database Failed !\n") ;
return FALSE ;
}
}
void CWdcDatabase::Close()
{
if(m_bOpen)
{
if(hstmt_select)
{
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
}
SQLDisconnect(hdbc) ; /*Dis hdbc*/
SQLFreeConnect(hdbc) ; /*Free Odbc*/
SQLFreeEnv(henv) ; /*Free henv*/
m_bOpen = false;
TRACE0("Close database Succeed !\n") ;
}
}
BOOL CWdcDatabase::Execute(const CString &sSQL)
{
RETCODE rc ;
unsigned char szSQLSTATE[6] ;
SDWORD nErr ;
unsigned char msg[MAX_ERROR_MSG + 1] ;
SWORD cbmsg ;
m_sErrMsg = "" ;
m_sQuery = sSQL ;
if(!m_bOpen)
return FALSE ;
SQLAllocStmt(hdbc,&hstmt) ;
memset((char*)szQuery,0x00,sizeof(szQuery)) ;
strcpy((char*)szQuery,m_sQuery) ;
rc = SQLExecDirect(hstmt,
szQuery,
SQL_NTS) ;
m_nError = (int) rc ;
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{
SQLTransact(henv,hdbc,SQL_COMMIT);
SQLFreeStmt(hstmt,SQL_DROP) ;
return TRUE ;
}
else
{
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt,
szSQLSTATE,
&nErr,
msg,
sizeof(msg),
&cbmsg) == SQL_SUCCESS)
m_sErrMsg = "\t\t" + (CString)msg + "\n" ;
SQLFreeStmt(hstmt,SQL_DROP) ;
return FALSE ;
}
}
/*带入条件为 Where 以后的条件*/
BOOL CWdcDatabase::DeleteRecord(CString &sWhereDelete)
{
RETCODE rc ;
unsigned char szSQLSTATE[6] ;
SDWORD nErr ;
unsigned char msg[MAX_ERROR_MSG+1] ;
SWORD cbmsg ;
CString sTemp ;
if(!m_bOpen)
return FALSE ;
m_sQuery = "" ;
m_sErrMsg = "" ;
/*开始构造删除语句*/
m_sQuery.Format("Delete From %s ",m_sTable) ;
/* int ff =0 ;
for(int f= 0 ;f<m_nFields;f++)
{
if(m_bKeyField[f]) /*如果是表的主键
{
if(ff>0) /*如果主键超过2个,要把条件连接起来
m_sQuery += " AND " ;
ff++ ;
if (m_bNumeric[f])
sTemp.Format("%s=%s",m_sFieldName[f],m_sFieldValue[f]) ;
else
sTemp.Format("%s=%s",m_sFieldName[f],Quote(m_sFieldValue[f])) ;
m_sQuery += sTemp ;
}
}
*/
if(sWhereDelete !="")
m_sQuery +=" Where " + sWhereDelete ;
TRACE0(m_sQuery) ;
memset((char*)szQuery,0x00,sizeof(szQuery)) ;
strcpy((char*)szQuery,m_sQuery) ;
SQLAllocStmt(hdbc,&hstmt) ;
rc = SQLExecDirect(hstmt,
szQuery,
SQL_NTS) ;
m_nError = (int) rc ;
if(rc ==SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{ /*如果执行成功*/
SQLTransact(henv,hdbc,SQL_COMMIT);
SQLFreeStmt(hstmt,SQL_DROP) ;
return TRUE ;
}
else
{
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt,
szSQLSTATE,
&nErr,
msg,
sizeof(msg),
&cbmsg) == SQL_SUCCESS)
m_sErrMsg = "\t\t" + (CString) msg + "\n" ;
SQLFreeStmt(hstmt,SQL_DROP) ;
return FALSE ;
}
}
CString CWdcDatabase::Quote(CString &sText)
{
CString sResult="" ;
CString sChar ;
int iTextLen = sText.GetLength() ;
for(int pos = 0 ;pos<iTextLen;pos++)
{
sChar = sText.Mid(pos,1) ;
if (sChar == "'")
sChar = "''" ;
sResult += sChar ;
}
return CString("'" + sResult + "'") ;
}
BOOL CWdcDatabase::AddRecord()
{
unsigned char szSQLSTATE[6] ;
SDWORD nErr ;
unsigned char msg[MAX_ERROR_MSG+1] ;
SWORD cbmsg ;
CString sTemp ;
if(!m_bOpen)
return FALSE ;
m_sQuery.Format("Insert Into %s(",m_sTable) ;
int ff=0 ;
for(int f=0 ;f<m_nFields;f++)
{
if(ff>0)
m_sQuery += "," ;
ff ++ ;
m_sQuery += m_sFieldName[f] ;
}
m_sQuery += ") values(" ;
ff = 0 ;
for(f=0 ;f<m_nFields ;f++)
{
if(ff>0)
m_sQuery += "," ;
ff ++ ;
/*---如果数据不为空*/
if(m_sFieldValue[f]!="")
{
if(m_bNumeric[f])
sTemp.Format("%s",m_sFieldValue[f]) ;
else
sTemp.Format("%s",Quote(m_sFieldValue[f])) ;
}
else
{ /*如果数据为空*/
sTemp.Format("%s","NULL") ;
}
m_sQuery += sTemp ;
}
m_sQuery += ")" ;
memset((char*)szQuery,0x00,sizeof(szQuery)) ;
strcpy((char*)szQuery,m_sQuery) ;
SQLAllocStmt(hdbc,&hstmt) ;
rc = SQLExecDirect(hstmt,
szQuery,
SQL_NTS) ;
m_nError = (int) rc ;
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{
SQLTransact(henv,hdbc,SQL_COMMIT);
SQLFreeStmt(hstmt,SQL_DROP) ;
hstmt=NULL ;
return TRUE ;
}
else
{
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt,
szSQLSTATE,
&nErr,
msg,
sizeof(msg),
&cbmsg) == SQL_SUCCESS )
m_sErrMsg += "\t\t" + (CString) msg +"\n" ;
SQLFreeStmt(hstmt,SQL_DROP) ;
return FALSE ;
}
}
/*更新表的指定纪录*/
BOOL CWdcDatabase::UpdateRecord()
{
unsigned char szSQLSTATE[6] ;
SDWORD nErr ;
unsigned char msg[MAX_ERROR_MSG + 1] ;
SWORD cbmsg ;
RETCODE rc ;
CString sTemp ;
if(!m_bOpen)
return FALSE ;
m_sQuery.Format("Update %s Set ",m_sTable) ;
int ff = 0 ;
for(int f= 0 ;f<m_nFields ;f++)
{
if (ff>0)
m_sQuery += "," ;
ff ++ ;
if(m_sFieldValue[f]!="") /*数据为空*/
{
if(m_bNumeric[f])
sTemp.Format("%s=%s",m_sFieldName[f],m_sFieldValue[f]) ;
else
sTemp.Format("%s=%s",m_sFieldName[f],Quote(m_sFieldValue[f])) ;
}
else
sTemp.Format("%s=%s",m_sFieldName[f],NULL) ;
m_sQuery += sTemp ;
}
m_sQuery += " Where " ;
ff = 0 ;
for(f=0 ;f<m_nFields ;f++)
{
if(m_bKeyField[f]) /*如果为主键*/
{
if(ff>0)
m_sQuery += "," ;
ff ++ ;
if(m_bNumeric[f])
sTemp.Format("%s=%s",m_sFieldName[f],m_sFieldValue[f]) ;
else
sTemp.Format("%s=%s",m_sFieldName[f],Quote(m_sFieldValue[f])) ;
m_sQuery += sTemp ;
}
}
memset((char*)szQuery,0x00,sizeof(szQuery)) ;
strcpy((char*)szQuery,m_sQuery) ;
SQLAllocStmt(hdbc,
&hstmt) ;
rc = SQLExecDirect(hstmt,
szQuery,
SQL_NTS) ;
m_nError = (int) rc ;
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{
SQLTransact(henv,hdbc,SQL_COMMIT);
SQLFreeStmt(hstmt,SQL_DROP) ;
return TRUE ;
}
else
{
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt,
szSQLSTATE,
&nErr,
msg,
sizeof(msg) ,
&cbmsg ) == SQL_SUCCESS )
m_sErrMsg += "\t\t" +(CString) msg + "\n" ;
SQLFreeStmt(hstmt,SQL_DROP) ;
return FALSE ;
}
}
/* 查找纪录---
返回值
1： 即没有错误发生的找到纪录
-1： 在查找过程中出现错误
0： 查找过程当中没有错误出现，但是没有找到适合条件的纪录，即没有返回纪录 */
int CWdcDatabase::SelectMatchingRecords(CString &sWhereContext)
{
unsigned char szSQLSTATE[6];
SDWORD nErr ;
unsigned char msg[MAX_ERROR_MSG+1] ;
SWORD cbmsg ;
CString sTemp ;
char szData[MAX_DATA] ;
SDWORD cbData ;
RETCODE rc ;
if(!m_bOpen)
return -1 ;
sTemp="" ;
int ff=0 ;
for(int j=0;j<m_nFields;j++)
{
if(ff>0)
sTemp += "," ;
ff ++ ;
sTemp += m_sFieldName[j] ;
}
if(sWhereContext == "")
m_sQuery.Format("Select %s from %s",sTemp,m_sTable) ;
else
m_sQuery.Format("Select %s From %s Where %s",sTemp,m_sTable,sWhereContext) ;
SQLAllocStmt(hdbc,&hstmt_select) ;
memset((char*)szQuery,0x00,sizeof(szQuery)) ;
strcpy((char*)szQuery,m_sQuery) ;
rc = SQLExecDirect(hstmt_select,
szQuery,
SQL_NTS) ;
m_nError = (int) rc ;
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{
rc = SQLFetch(hstmt_select );
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{ /*执行成功，并且有数据*/
for(int f = 0 ; f<m_nFields ; f++)
{
rc = SQLGetData(hstmt_select,
f+1 ,
SQL_C_CHAR,
szData,
sizeof(szData) ,
&cbData ) ;
if(cbData != SQL_NULL_DATA)
{ /*如果数据不为空*/
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
m_sFieldValue[f] = CString(szData) ;
else
m_sFieldValue[f] = "" ;
}
else
m_sFieldValue[f] = "" ;
}
return 1 ; /*执行成功，并且有数据*/
}
else if(rc == 100)
{ /*查找成功，但是没有数据*/
return 0 ;
}
}
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt_select,
szSQLSTATE,
&nErr,
msg,
sizeof(msg),
&cbmsg) == SQL_SUCCESS )
m_sErrMsg += "\t\t" +CString(msg) + "\n" ;
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
return -1 ;
}
BOOL CWdcDatabase::NextMatchingRecord()
{
unsigned char szSQLSTATE[6] ;
SDWORD nErr ;
unsigned char msg[MAX_ERROR_MSG+1] ;
SWORD cbmsg ;
char szData[MAX_DATA] ;
SDWORD cbData ;
RETCODE rc ;
if(!m_bOpen)
return FALSE ;
rc = SQLFetch(hstmt_select) ;
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{
for(int f =0 ;f<m_nFields ; f++)
{
rc = SQLGetData(hstmt_select,
f+1 ,
SQL_C_CHAR,
szData,
sizeof(szData),
&cbData) ;
if(cbData !=SQL_NULL_DATA)
{ /*如果数据不为空*/
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
m_sFieldValue[f] = (CString) szData ;
else
m_sFieldValue[f] = "" ;
}
else
m_sFieldValue[f] = "" ;
}
return TRUE ;
}
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt_select,
szSQLSTATE,
&nErr,
msg,
sizeof(msg),
&cbmsg )==SQL_SUCCESS )
m_sErrMsg += "\t\t" +CString (msg) + "\n" ;
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
return FALSE ;
}
/*统计符合条件的纪录总数
返回值
-1: 执行出错
>0: 执行成功,并且返回统计结果 */
long CWdcDatabase::GetRecordCount(CString &sSel)
{
unsigned char szSQLSTATE[6] ;
SDWORD nErr ;
unsigned char ErrMsg[500] ;
SWORD cbmsg;
long lRet ; /*返回值*/
unsigned char lpSelect[1000];
memset((char*)lpSelect,0x00,sizeof(lpSelect)) ;
if(sSel=="")
sTemp.Format("Select count(*) from %s ",m_sTable) ;
else
sTemp.Format("Select Count(*) From %s Where %s",m_sTable,sSel) ;
if(!m_bOpen)
return -1 ;
strcpy((char*)lpSelect,sTemp) ;
SQLAllocStmt(hdbc,&hstmt_select) ;
rc=SQLExecDirect(hstmt_select,
lpSelect,
SQL_NTS) ;
if(rc==SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{ /* SQLExecDirect True*/
SQLBindCol(hstmt_select,1,SQL_INTEGER,&lRet,sizeof(int),NULL) ;
rc = SQLFetch(hstmt_select) ;
if(rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO)
{ /*有数据*/
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
return lRet ;
}
else if (rc == 100)
{ /*没有数据*/
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
return 0 ;
}
else if (rc < 0)
{ /*出错*/
goto end ;
}
}
else
{ /* SQLExecDirect FALSE */
goto end ;
}
end:
{
m_sErrMsg = "" ;
while(SQLError(0,
0,
hstmt_select,
szSQLSTATE,
&nErr,
ErrMsg,
sizeof(ErrMsg),
&cbmsg)==SQL_SUCCESS)
m_sErrMsg += "\t\t" + CString(ErrMsg) +"\n" ;
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
return -1 ;
}
}
/*非常有用函数,用在确保语句句柄释放*/
void CWdcDatabase::DropHstmtSelect()
{
if(hstmt_select !=NULL)
{
SQLFreeStmt(hstmt_select,SQL_DROP) ;
hstmt_select = NULL ;
}
}
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