调用
SQLWCHAR SqlState[6], SQLStmt[100], Msg[SQL_MAX_MESSAGE_LENGTH];
SQLINTEGER NativeError;
SQLSMALLINT i, MsgLen;
SQLRETURN rc2;
i = 1;
while ((rc2 = SQLGetDiagRec(SQL_HANDLE_DBC,hdbc1, i, SqlState, &NativeError,
Msg, sizeof(Msg), &MsgLen)) != SQL_NO_DATA)
{
//DisplayError(SqlState,NativeError,Msg,MsgLen);
111 cout<<SqlState<<" "<<NativeError<<" "<<Msg;
i++;
}
在111处设置断点，DEBUG发现错误是
rc2 0 short
+ SqlState 0x0041fd1c "IM002" wchar_t [6]
+ Msg 0x0041f844 "[Microsoft][ODBC 驱动程序管理器] 未发现数据源名称并且未指定默认驱动程序" wchar_t [512]
i 1 short
NativeError 0 long
MsgLen 45 short
请问我该怎么配置环境，是配置用户DSN，还是系统DSN，我两个都配置成功了，为什么连接时候还是出错
附上我的代码
#include <stdio.h>
//#include <iostream.h>
#include <string.h>
#include <windows.h>
#include <sql.h>
#include <sqlext.h>
#include<sqltypes.h>
#include<odbcinst.h >
#include <odbcss.h>
#include <iostream>
using namespace std;
#pragma comment(lib,"odbc32.lib")
#define MAXBUFLEN 255
#define MaxNameLen 20
#define SQLBINDCOL
SQLHENV henv = SQL_NULL_HENV;//定义环境句柄
SQLHDBC hdbc1 = SQL_NULL_HDBC;//定义数据库连接句柄
SQLHSTMT hstmt1 = SQL_NULL_HSTMT;//定义语句句柄
int main()
{
RETCODE retcode;//错误返回码
// Allocate the ODBC Environment and save handle.
retcode = SQLAllocHandle (SQL_HANDLE_ENV, NULL, &henv);
if(retcode < 0 )//错误处理
{
cout<<"allocate ODBC Environment handle errors."<<endl;
return -1;
}
// Notify ODBC that this is an ODBC 3.0 application.
retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION,
(SQLPOINTER) SQL_OV_ODBC3, SQL_IS_INTEGER);
if(retcode < 0 ) //错误处理
{
cout<<"the ODBC is not version3.0 "<<endl;
return -1;
}
// Allocate an ODBC connection and connect.
retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc1);
if(retcode < 0 ) //错误处理
{
cout<<"allocate ODBC connection handle errors."<<endl;
return -1;
}
//Data Source Name must be of type User DNS or System DNS
char* szDSN = "dbtest";
char* szUID = "s20092694";//log name
char* szAuthStr = "616458";//passward
//connect to the Data Source
retcode=SQLConnect(hdbc1,(SQLWCHAR*)szDSN,SQL_NTS,(SQLWCHAR*)szUID,SQL_NTS,(SQLWCHAR*)szAuthStr,SQL_NTS);
if(retcode < 0 ) //错误处理
{
cout<<"connect to ODBC datasource errors."<<endl;
SQLWCHAR SqlState[6], SQLStmt[100], Msg[SQL_MAX_MESSAGE_LENGTH];
SQLINTEGER NativeError;
SQLSMALLINT i, MsgLen;
SQLRETURN rc2;
i = 1;
while ((rc2 = SQLGetDiagRec(SQL_HANDLE_DBC,hdbc1, i, SqlState, &NativeError,
Msg, sizeof(Msg), &MsgLen)) != SQL_NO_DATA)
{
//DisplayError(SqlState,NativeError,Msg,MsgLen);
cout<<SqlState<<" "<<NativeError<<" "<<Msg;
i++;
}
return -1;
}
// Allocate a statement handle.
retcode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc1, &hstmt1);
if(retcode < 0 ) //错误处理
{
cout<<"allocate ODBC statement handle errors."<<endl;
return -1;
}
// Execute an SQL statement directly on the statement handle.每一句后面都跟了一个错误处理，当发生错误时可以很方便的判断错在哪里
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"create table provider (sno char(5) primary key,sname char(10) not null,status int,city char(10))", SQL_NTS);
if(retcode<0)
{
cout<<"creat errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"insert into provider values('S1','精益','20','天津')",SQL_NTS);
if(retcode<0)
{
cout<<"s1 insert errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"insert into provider values('S2','胜锡','10','北京')",SQL_NTS);
if(retcode<0)
{
cout<<"s2 insert errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"insert into provider values('S3','东方红','30','天津')",SQL_NTS);
if(retcode<0)
{
cout<<"s3 insert errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"insert into provider values('S4','丰泰盛','20','天津')",SQL_NTS);
if(retcode<0)
{
cout<<"s4 insert errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"insert into provider values('S5','为民','30','上海')",SQL_NTS);
if(retcode<0)
{
cout<<"s5 insert errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"insert into provider values('S6','通天','25',null)",SQL_NTS);
if(retcode<0)
{
cout<<"s6 insert errors."<<endl;
return -1;
}
retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"SElECT sname,city FROM provider where sno='s1'", SQL_NTS);
if(retcode < 0 )
{
cout<<"Executing statement throught ODBC errors."<<endl;
return -1;
}
/* retcode = SQLExecDirect(hstmt1,(SQLWCHAR*)"drop table provider", SQL_NTS);
if(retcode<0)
{
cout<<"drop errors."<<endl;
return -1;
}*/
// SQLBindCol variables
SQLWCHAR city[MaxNameLen + 1];
SQLWCHAR name[MaxNameLen + 1];
SQLINTEGER columnLen = 0;//数据库定义中该属性列的长度
#ifdef SQLBINDCOL
//游标已被封装在其中，一开始把两个列号分别写为provider中的列号2（name），4（city），结果name的值为city的值，city的值为烫烫烫烫烫烫烫烫，这才发现第二个参数应为游标中的列号，而不是表中的列号，
retcode = SQLBindCol(hstmt1, 1, SQL_C_CHAR,name,MaxNameLen , &columnLen);
retcode = SQLBindCol(hstmt1, 2, SQL_C_CHAR,city,MaxNameLen , &columnLen);
while ( (retcode = SQLFetch(hstmt1) ) != SQL_NO_DATA)
{
if(columnLen>0)
printf("name = %s city = %s\n", name,city);
else
printf("name = %s city = NULL\n", name,city);
}
#else
while(1 )
{
retcode = SQLFetch(hstmt1);
if(retcode == SQL_NO_DATA)
break;
retcode = SQLGetData(hstmt1, 1, SQL_C_CHAR, name, MaxNameLen, &columnLen);
retcode = SQLGetData(hstmt1, 2, SQL_C_CHAR, city, MaxNameLen, &columnLen);
if(columnLen>0)
printf("name = %s city = %s\n", name,city);
else
printf("name = %s city = NULL\n", name,city);
}
#endif
/* Clean up.*/
SQLFreeHandle(SQL_HANDLE_STMT, hstmt1);
SQLDisconnect(hdbc1);
SQLFreeHandle(SQL_HANDLE_DBC, hdbc1);
SQLFreeHandle(SQL_HANDLE_ENV, henv);
return(0);
}
