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问答

初学者，想用C来连接MySql，请指教！

yb611 2004-01-12 02:12:57

我的操作系统是RedHat 7.3（未完全安装，事后装的mysql-3.22.25.tar.gz），请问怎样这在个环境下用C语言来连接到MySql数据库，我只知道MySql自带了和C语言的接口，但是具体怎样使用，怎样进行编译却不清楚，请给个代码，帮帮我吧，多谢！！！

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kodo 2004-01-14

看example就知道了阿

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lovered 2004-01-14

这几天正好在做这个，可以看下mysql手册，有C的API调用

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mechgoukiteng 2004-01-14

看他的文档 pdf 有c接口的api函数

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young_wind 2004-01-14

MYSQL *
do_connect (char *host_name, char *user_name, char *password, char *db_name,unsigned int port_num, char *socket_name, unsigned int flags)
{
MYSQL *conn; /* pointer to connection handler */
conn = mysql_init (NULL);
/* allocate, initialize connection handler */
if (conn == NULL)
{
print_error (NULL, "mysql_init() failed (probably out of memory)");
return (NULL);
}
#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 32200
/* 3.22 and up */
if (mysql_real_connect (conn, host_name, user_name, password,
db_name, port_num, socket_name, flags) == NULL)
{
print_error (conn, "mysql_real_connect() failed");
return (NULL);
}
#else /* pre-3.22 */
if (mysql_real_connect (conn, host_name, user_name, password,
port_num, socket_name, flags) == NULL)
{
print_error (conn, "mysql_real_connect() failed");
return (NULL);
}
if (db_name != NULL) /* simulate effect of db_name parameter */
{
if (mysql_select_db (conn, db_name) != 0)
{
print_error (conn, "mysql_select_db() failed");
mysql_close (conn);
return (NULL);
}
}
#endif
return (conn); /* connection is established */
}

void
do_disconnect (MYSQL *conn)
{
mysql_close (conn);
}

void
print_error (MYSQL *conn, char *message)
{
fprintf (stderr, "%s\n", message);
if (conn != NULL)
{
fprintf (stderr, "Error %u (%s)\n",
mysql_errno (conn), mysql_error (conn));
}
}
bool
processquery_noresult(MYSQL *conn, char *query)
{
MYSQL_RES *res_set;
if (mysql_query (conn, query) != 0) /* the query failed */
{
print_error (conn, "process_query() failed");
return false;
}
/* the query succeeded; determine whether or not it returns data */
res_set = mysql_store_result (conn);
if (res_set == NULL) /* no result set was returned */
{
/*
* does the lack of a result set mean that an error
* occurred or that no result set was returned?
*/
if (mysql_field_count (conn) > 0)
{
/*
* a result set was expected, but mysql_store_result()
* did not return one; this means an error occurred
*/
print_error (conn, "Problem processing result set");
return false;
}
else
{
/*
* no result set was returned; query returned no data
* (it was not a SELECT, SHOW, DESCRIBE, or EXPLAIN)
* so just report number of rows affected by query
*/
return true;
}
}
}
void
process_query(MYSQL *conn, char *query,MYSQL_RES *res_set)
{
unsigned int field_count;
if (mysql_query (conn, query) != 0) /* the query failed */
{
print_error (conn, "process_query() failed");
return;
}
/* the query succeeded; determine whether or not it returns data */
res_set = mysql_store_result (conn);
if (res_set == NULL) /* no result set was returned */
{
/*
* does the lack of a result set mean that an error
* occurred or that no result set was returned?
*/
if (mysql_field_count (conn) > 0)
{
/*
* a result set was expected, but
* mysql_store_result() did not return
* one; this means an error occurred
*/
print_error(conn, "Problem processing result set");
}
else
{
/*
* no result set was returned; query returned
* no data(it was not a SELECT, SHOW, DESCRIBE,
* or EXPLAIN),so just report number of rows
* affected by query
*/
fprintf (stderr,"%lu rows affected\n",
(unsigned long) mysql_affected_rows (conn));
}
}
else /* a result set was returned */
{
/* process rows, then free the result set */
fprintf(stderr,"%s\n","process query successful");
fprintf(stderr,"%d rows returned\n",(unsigned long)mysql_num_rows(res_set));
}
}

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