Linux C连接Mysql数据库

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1. 连接数据库

/*练习mysql数据库的连接*/#include <stdio.h>#include <mysql.h>int main(){MYSQL mysql;int t, r;/*连接之前，先用mysql_init初始化MYSQL连接句柄*/mysql_init(&mysql);/*使用mysql_real_connect连接服务器,其参数依次为MYSQL句柄，服务器IP地址，登录mysql的用户名，密码，要连接的数据库等*/if(!mysql_real_connect(&mysql, "localhost", "root", "6748355", "spytest", 0, NULL, 0)) {printf("Error connecting to Mysql!\n");}else {printf("Connected Mysql successful!\n");}/*关闭连接*/mysql_close(&mysql);return 0;}

2. 数据库查询

/*练习mysql数据库的查询*/#include <stdio.h>#include <string.h>#include "mysql.h"int main(){MYSQL mysql;MYSQL_RES *res;MYSQL_ROW row;char *query;int flag, t;mysql_init(&mysql);if(!mysql_real_connect(&mysql, "localhost", "root", "6748355", "spytest", 0, NULL, 0)) {printf("Failed to connect to Mysql!\n");return 0;}else {printf("Connected to Mysql successfully!\n");}query = "select * from log";/*查询，成功则返回0*/flag = mysql_real_query(&mysql, query, (unsigned int)strlen(query));if(flag) {printf("Query failed!\n");return 0;}else {printf("[%s] made...\n", query);}/*mysql_store_result讲全部的查询结果读取到客户端*/res = mysql_store_result(&mysql);/*mysql_fetch_row检索结果集的下一行*/while(row = mysql_fetch_row(res)) {/*mysql_num_fields返回结果集中的字段数目*/for(t=0; t<mysql_num_fields(res); t++){printf("%s\t", row[t]);}printf("\n");}mysql_close(&mysql);return 0;}

3. 数据库插入数据

/*练习mysql数据库的数据添加*/#include <stdio.h>#include <string.h>#include "mysql.h"int main(){MYSQL mysql;MYSQL_RES *res;MYSQL_ROW row;char *query;int flag, t;mysql_init(&mysql);if(!mysql_real_connect(&mysql, "localhost", "root", "6748355", "spytest", 0, NULL, 0)) {printf("Failed to connect to Mysql!\n");return 0;}else {printf("Connected to Mysql successfully!\n");}query = "insert into log(title, keyword, content) values('sleep', 'rest', 'I have a dream')";/*插入，成功则返回0*/flag = mysql_real_query(&mysql, query, (unsigned int)strlen(query));if(flag) {printf("Insert data failure!\n");return 0;}else {printf("Insert data success!\n");}mysql_close(&mysql);return 0;}

4. 数据库删除

/*练习mysql数据库的删除*/#include <stdio.h>#include <string.h>#include "mysql.h"int main(){MYSQL mysql;MYSQL_RES *res;MYSQL_ROW row;char *query;int flag, t;mysql_init(&mysql);if(!mysql_real_connect(&mysql, "localhost", "root", "6748355", "spytest", 0, NULL, 0)) {printf("Failed to connect to Mysql!\n");return 0;}else {printf("Connected to Mysql successfully!\n");}query = "delete from log where log_id=3";/*删除，成功则返回0*/flag = mysql_real_query(&mysql, query, (unsigned int)strlen(query));if(flag) {printf("Delete data failure!\n");return 0;}else {printf("Delete data success!\n");}mysql_close(&mysql);return 0;}