Redhat C++连接Mysql数据库

一、代码如下

#include "/usr/local/mysql/include/mysql/mysql.h"

#include <stdio.h>

int main(int argc,char *argv[])

{

char *user="root",*pwd="123456",*dbname="test";

MYSQL mysql;

MYSQL_RES *mysql_ret;

MYSQL_ROW row;

unsigned long num_rows;

int ret;

mysql_init(&mysql);

if(mysql_real_connect(&mysql,NULL,user,pwd,dbname,0,NULL,0))

{

printf("Connectionsuccess!\n");

mysql_query(&mysql,"set names 'latin1'");

ret=mysql_query(&mysql,"select * from sys_userinfo limit 5");

if(!ret)

{

printf("查询成功！");

mysql_ret=mysql_store_result(&mysql);

if(mysql_ret!=NULL)

{

num_rows=mysql_num_rows(mysql_ret);

if(num_rows!=0)

{

printf("%d\n",num_rows);

while(row=mysql_fetch_row(mysql_ret))

{

printf("%s\t%s\t%s\t%s\t%s\t%s\n",row[0],row[1],row[2],row[3],row[4],row[5]);

}

}

else

{

return -1;

}

mysql_free_result(mysql_ret);

return 0;

}

else

{

return -1;

}

}else{

return -1;

}

mysql_close(&mysql);

}else{

return -1;

}

}

g++ mysqlconn.c -o mysqlconn -lmysqlclient -L/usr/local/mysql/lib/mysql/

./mysqlconn

二、Mysql.h文件中mysql 的源码包中。

Libmysqlclient.so.15错误为ldconfig链接引用无加载libmysqlclient.so文件

Cd /etc/ld.so.conf.d

Vi mysql-i386.conf

加入/usr/local/mysql/lib/mysql代码OK。

三、Mysql C API

my_ulonglong STDCALL mysql_num_rows(MYSQL_RES *res);//获取数据集行数
unsigned int STDCALL mysql_num_fields(MYSQL_RES *res);//获取数据集字段数
my_bool STDCALL mysql_eof(MYSQL_RES *res);
MYSQL_FIELD *STDCALL mysql_fetch_field_direct(MYSQL_RES *res,
                          unsigned int fieldnr);
MYSQL_FIELD * STDCALL mysql_fetch_fields(MYSQL_RES *res);//根据字段循环数据集（字段名）

MYSQL_ROW    STDCALL mysql_fetch_row(MYSQL_RES *result);//根据行循环数据库集（从0开始的字段序号）
MYSQL_ROW_OFFSET STDCALL mysql_row_tell(MYSQL_RES *res);
MYSQL_FIELD_OFFSET STDCALL mysql_field_tell(MYSQL_RES *res);

unsigned int STDCALL mysql_field_count(MYSQL *mysql);
my_ulonglong STDCALL mysql_affected_rows(MYSQL *mysql);//获取影响行数
my_ulonglong STDCALL mysql_insert_id(MYSQL *mysql);//获取插入ID
unsigned int STDCALL mysql_errno(MYSQL *mysql);//错误号
const char * STDCALL mysql_error(MYSQL *mysql);//错误详细信息
const char *STDCALL mysql_sqlstate(MYSQL *mysql);
unsigned int STDCALL mysql_warning_count(MYSQL *mysql);
const char * STDCALL mysql_info(MYSQL *mysql);
unsigned long STDCALL mysql_thread_id(MYSQL *mysql);
const char * STDCALL mysql_character_set_name(MYSQL *mysql);
int          STDCALL mysql_set_character_set(MYSQL *mysql, const char *csname);

MYSQL *        STDCALL mysql_init(MYSQL *mysql);//初始化
my_bool        STDCALL mysql_ssl_set(MYSQL *mysql, const char *key,
                      const char *cert, const char *ca,
                      const char *capath, const char *cipher);
const char *    STDCALL mysql_get_ssl_cipher(MYSQL *mysql);
my_bool        STDCALL mysql_change_user(MYSQL *mysql, const char *user,
                      const char *passwd, const char *db);
MYSQL *        STDCALL mysql_real_connect(MYSQL *mysql, const char *host,
                       const char *user,
                       const char *passwd,
                       const char *db,
                       unsigned int port,
                       const char *unix_socket,
                       unsigned long clientflag);//连接MYSQL
int        STDCALL mysql_select_db(MYSQL *mysql, const char *db);//切换数据库
int        STDCALL mysql_query(MYSQL *mysql, const char *q);//增，删，改，查
int        STDCALL mysql_send_query(MYSQL *mysql, const char *q,
                     unsigned long length);
int        STDCALL mysql_real_query(MYSQL *mysql, const char *q,
                    unsigned long length);
MYSQL_RES *     STDCALL mysql_store_result(MYSQL *mysql);
MYSQL_RES *     STDCALL mysql_use_result(MYSQL *mysql);

/* perform query on master */
my_bool        STDCALL mysql_master_query(MYSQL *mysql, const char *q,
                       unsigned long length);
my_bool        STDCALL mysql_master_send_query(MYSQL *mysql, const char *q,
                        unsigned long length);
/* perform query on slave */ 
my_bool        STDCALL mysql_slave_query(MYSQL *mysql, const char *q,
                      unsigned long length);
my_bool        STDCALL mysql_slave_send_query(MYSQL *mysql, const char *q,
                           unsigned long length);
void        STDCALL mysql_get_character_set_info(MYSQL *mysql,
                           MY_CHARSET_INFO *charset);

更具体的可以查看mysql.h文件代码

四、查询出来的数据库在Redhat终端中显示乱码。有知道的博友麻烦赐教一下。谢谢！