linux C mysql 编程
先转一个
//Test1.c:
#include <stdio.h>
#include <mysql.h>
int main(int argc, char *argv[])
{
int i;
char *names[3];
names[0] = "haha";
names[1] = "xixi";
names[2] = "wuwu";
char execsql[1024];
MYSQL mysql_conn;
if(mysql_init(&mysql_conn) != NULL){
if(mysql_real_connect(&mysql_conn, "localhost", "root", "xiaodan", "test", MYSQL_PORT, NULL, 0) != NULL)
{
printf("Good connection!/n");
sprintf(execsql, "create database one_db");
mysql_real_query(&mysql_conn, execsql, strlen(execsql));
// if (!mysql_create_db(&mysql_conn, "one_db")){
i = mysql_affected_rows(&mysql_conn);
if (i<=0){
printf("Can not create database one_db /n");
}
else{
mysql_select_db(&mysql_conn, "one_db");
sprintf(execsql, "create table girls(name char(10), age int(8))");
mysql_real_query(&mysql_conn, execsql, strlen(execsql));
mysql_select_db(&mysql_conn, "one_db");
for(i=0; i<3; i++){
sprintf(execsql,"insert into girls values('%s', %d)", names[i], 19+i);
printf("%s /n", execsql);
mysql_query(&mysql_conn, execsql);
}
}
}else{
printf("Connection Failed!/n");
}
}else{
printf("Initialization Failed./n");
return -1;
}
mysql_close(&mysql_conn);
return 0;
}
编译命令：gcc -g -o test1 -I/usr/include/mysql test1.c -L/usr/lib/mysql -lmysqlclient -lz
//Test2.c
#include <stdio.h>
//#include <dmalloc.h>
#include <mysql.h>
int main(int argc, char **argv) {
MYSQL mysql_conn; /* Connection handle */
MYSQL_RES *mysql_result; /* Result handle */
MYSQL_ROW mysql_row; /* Row data */
int f1, f2, num_row, num_col;
if (mysql_init(&mysql_conn) != NULL) {
if (mysql_real_connect(&mysql_conn, "localhost", "root", "xiaodan", "one_db", MYSQL_PORT, NULL, 0) != NULL) {
if (mysql_query(&mysql_conn, "select * from girls") == 0) {
/* 以上我们执行select语句，查询表中所以记录*/
mysql_result = mysql_store_result(&mysql_conn); // get the result from the executing select query
num_row = mysql_num_rows(mysql_result); /* Get the no. of row */
num_col = mysql_num_fields(mysql_result); /* Get the no. of column */
for (f1 = 0; f1 < num_row; f1++) {
// for (f2 = 0; f2 < num_col; f2++) {
mysql_row = mysql_fetch_row(mysql_result); /* Fetch one by one */
printf("[Row %d, Col 0] ==> [%s]/n", f1, mysql_row[0]);
printf("[Row %d, Col 1] ==> [%s]/n", f1, mysql_row[1]);
// }
}
} else {
(void) printf("Query fails/n");
}
} else {
(void) printf("Connection fails/n");
}
} else {
(void) printf("Initialization fails/n");
}
mysql_free_result(mysql_result);
mysql_close(&mysql_conn);
return 0;
}
编译命令：gcc -g -o test2 -I/usr/include/mysql test2.c -L/usr/lib/mysql -lmysqlclient -lz
注意：使用rpm包安装的数据库没有用于开发的头文件和库，需要下载MySQL-devel的rpm开发包
下面的是我自己写的一个
*
*file name: mysql.c
*
*/
#include < stdio.h >
#include < stdlib.h >
#include " mysql.h "
int main( void )
{
const char * host = " localhost " ;
const char * user = " root " ;
const char * pass = "" ;
const char * db = " mysql " ;
/* 定义mysql变量 */
MYSQL mysql;
MYSQL_RES * rs;
MYSQL_ROW row;
mysql_init( & mysql); /* 初始化 */
/* 连接数据库 */
if ( ! mysql_real_connect( & mysql, host, user, pass, db, 0 , NULL, 0 ))
{
printf( " %s " , mysql_error( & mysql));
}
char * sql = " select host,user from user order by rand() " ;
if (mysql_query( & mysql, sql) != 0 )
{ /* 查询 */
printf( " %s " , mysql_errno( & mysql), mysql_error( & mysql));
}
rs = mysql_store_result( & mysql); /* 获取查询结果 */
while ((row = mysql_fetch_row(rs)))
{ /* 获取每一行记录 */
printf( " %s---%s " , row[ 0 ], row[ 1 ]);
}
mysql_free_result(rs); /* 释放结果集 */
mysql_close( & mysql); /* 关闭连接 */
return 1 ;
}
编译：$gcc -g -o mysql -I/usr/local/mysql/include/mysql mysql.c -L/usr/locla/mysql/lib/mysql -lmysqlclient -lz
如果运行的时候报libmysqlclient.so.16 找不到错误，运行下面命令。
$ln -s /usr/local/mysql/lib/mysql/libmysqlclient.so.16 /lib/libmysqlclient.so.16
如果运行程序：
$gcc -g -o mysql -I/usr/local/mysql/include/mysql mysql.c -L/usr/locla/mysql/lib/mysql -lmysqlclient -lz 会在当前目录生成 mysql文件
./mysql运行
或者
/path-to -mysql/mysql