用Dev-CPP来测试MySQL的C API程序，执行到第三步，不行，请大虾指教！谢谢！

明月登楼 2005-08-31 10:23:14

/*
Name: MySQLClientTest
Author: Kip Warner (kip@zero47.com)
Date: 24/11/03 13:15
Description: Example to show usage of MySQL databases from client end.
I did not have much time. Sorry...
*/

// Includes...
#include <windows.h>
#include <MySQL/mysql.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

// Database name...
char g_szHost[] = "localhost";
UINT g_unPort = MYSQL_PORT;
char g_szUserName[] = "root";
char g_szPassword[] = "caoxin";
char g_szDatabase[] = "mydata";
char g_szSQLStatement[] = "SELECT * FROM `yuangong` WHERE 1";

// Entry point...
int main(int nArguments, char *pszArguments[])
{
// Variables...
MYSQL *myDatabase = NULL;
MYSQL_RES *myResult = NULL;
MYSQL_FIELD *myField = NULL;
MYSQL_ROW myRow = NULL;
UINT unRecords = 0;
UINT unFields = 0;
UINT unIndex = 0;
UINT unFieldIndex = 0;

// Initialize MySQL...
myDatabase = mysql_init(NULL);
int temp=0;
// Failed...
if(!myDatabase)
{
// Alert user...
printf("] Error: Unable to initialize MySQL API...\n");

// Cleanup, abort, terminate...
mysql_close(myDatabase);
getch();
return 0;
}

// Connect to server and check for error...
if(mysql_real_connect(myDatabase, g_szHost, g_szUserName, g_szPassword,
NULL, g_unPort, NULL, 0) != 0)
{
// Alert user...
printf("] Error: Unable to connect to server...\n");

// Cleanup, abort, terminate...
mysql_close(myDatabase);
getch();
return 0;
}

// Select database in server and check for error...
if((temp=mysql_select_db(myDatabase, g_szDatabase)) != 0) //执行到此步就行了，就提出如下的错误，请大虾赐教！
{
// Alert user...
printf("] Error: Unable to select *%d* database...\n",temp);

// Cleanup, abort, terminate...
mysql_close(myDatabase);
getch();
return 0;
}

// Query database and check for error...
if(mysql_query(myDatabase, g_szSQLStatement) != 0)
{
// Alert user...
printf("] Error: Unable to execute query...\n");

// Cleanup, abort, terminate...
mysql_close(myDatabase);
getch();
return 0;
}

// Retrieve query result from server...
myResult = mysql_store_result(myDatabase);

// Failed...
if(!myResult)
{
// Alert user...
printf("] Error: Unable to retrieve result...\n");

// Cleanup, abort, terminate...
mysql_close(myDatabase);
getch();
return 0;
}

// How many records were returned in the result set?

// Calculate...
unRecords = mysql_num_rows(myResult);

// Alert user...
printf("] Query: %d records found...\n", unRecords);

// How many fields are present in a record?

// Calculate...
unFields = mysql_num_fields(myResult);

// Alert user...
printf("] Query: There are %d fields in each record...", unFields);

// Output records...
for(unIndex = 0; unIndex < unRecords; unIndex++)
{
// Fetch row from results...
myRow = mysql_fetch_row(myResult);

// Fetch fields from row...
myField = mysql_fetch_fields(myResult);

// Show record...
printf("] Record: %d / %d\n", unIndex, unRecords);

// Output all fields in this row...
for(unFieldIndex = 0; unFieldIndex < unFields; unFieldIndex++)
{
// Output...
printf("\t%s", myField[unFieldIndex].name);
}
}

// Free result...
mysql_free_result(myResult);

// Close server connection...
mysql_close(myDatabase);
myDatabase = NULL;

// Alert user, exit...
printf("] Done, press any key to exit...\n");
getch();
return 0;
}

...全文