odbcconnect7.c

b树实现源码,linux和unix下运行,速度快,极好用

//  SQLConnect, again call SQLConnect.
//  second SQLConnect should return "connection name in use".

//  AUTHOR : Jitendra  Lenka

#include<stdio.h>
#include<stdlib.h>
#include<sql.h>
#include<sqlext.h>
#include<string.h>
    
//*************************************************************************

inline void checkrc(int rc,int line)
{
   if(rc)
   {
       printf("ERROR %d at line %d\n",rc,line);
       exit(1);
   }
}

//*************************************************************************
int main()
{
  SQLHENV env;
  SQLHDBC dbc;
  SQLHSTMT stmt;
  SQLRETURN ret;
  SQLCHAR outstr[1024];
  SQLSMALLINT outstrlen;
  
  // Aloocate an environment handle
  ret=SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&env);
  checkrc(ret,__LINE__);
  
   //we need odbc3 support
   SQLSetEnvAttr(env,SQL_ATTR_ODBC_VERSION,(void*)SQL_OV_ODBC3,0);
   
  //ALLOCATE A Connection handle
  ret = SQLAllocHandle(SQL_HANDLE_DBC,env,&dbc);
  checkrc(ret,__LINE__);
    
  // connect to the Data source
   ret = SQLConnect (dbc,
                   (SQLCHAR *) "test", (SQLSMALLINT) strlen ("test"),
                   (SQLCHAR *) "root",
                   (SQLSMALLINT) strlen ("root"),
                   (SQLCHAR *) "manager",
                   (SQLSMALLINT) strlen (""));


  if(SQL_SUCCEEDED(ret))
  {
     printf("\nConnected to the Data Source..\n");
     
  }  
     
  
   else
   {
        printf("error in connection\n");
        ret = SQLFreeHandle(SQL_HANDLE_DBC,dbc);
        checkrc(ret,__LINE__);

        ret = SQLFreeHandle(SQL_HANDLE_DBC,env);
        checkrc(ret,__LINE__);
        return 1;
   }
   //*********************************************************************
   //again call to driver connect
    
   ret = SQLConnect (dbc,
                   (SQLCHAR *) "test", (SQLSMALLINT) strlen ("test"),
                   (SQLCHAR *) "root",
                   (SQLSMALLINT) strlen ("root"),
                   (SQLCHAR *) "manager",
                   (SQLSMALLINT) strlen (""));

   int rettype = ret; 

  if(SQL_SUCCEEDED(ret))
  {
     printf("\nConnected to the Data Source..\n");
     
             
   }

  
   else
   {
        printf("Connection name  in use\n");
    }

   //**********************************************************************
   ret = SQLDisconnect(dbc);
   checkrc(ret,__LINE__);
   
   ret = SQLFreeHandle(SQL_HANDLE_DBC,dbc);
   checkrc(ret,__LINE__);
   
   ret = SQLFreeHandle(SQL_HANDLE_ENV,env);
   checkrc(ret,__LINE__);
   if(rettype ==0)return 1;
   return 0;
}