C连接MySQL数据库开发之Linux环境完整示例演示（增、删、改、查_MySQL

////main.c//mysql数据库编程////Created by YangXin on 14-5-22.//Copyright (c) 2014年 yangxin. All rights reserved.//#include <stdio.h>#include <stdlib.h>#include <string.h>#include <mysql.h>MYSQL mysql;// 查询int query();// 修改int update();// 添加数据my_ulonglong add();// 参数化添加数据my_ulonglong addByParams();// 删除数据my_ulonglong delete();// 打印数据库服务器信息void printMySqlInfo();int main(int argc, const char * argv[]){	/*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", "yangxin", "test", 0, NULL, 0)) {		printf("connecting to Mysql error:%d from %s/n",mysql_errno(&mysql), mysql_error(&mysql));		return -1;	}else {		printf("Connected Mysql successful!/n");	}		printMySqlInfo();		// 设置编码	mysql_query(&mysql, "set names utf8");		// 参数化添加数据	addByParams();		// 查询	query();		// 修改	update();		// 添加	add();		// 删除	delete();		/*关闭连接*/	mysql_close(&mysql);	return 0;}// 查询int query(){	int flag, i;	const char *sql = NULL;	MYSQL_RES *res = NULL;	MYSQL_ROW row = NULL;	MYSQL_FIELD *fields = NULL;	sql = "select * from t_user" ;	flag = mysql_real_query(&mysql, sql, (unsigned int)strlen(sql));	if (flag) {		printf("query error:%d from %s/n",mysql_errno(&mysql),mysql_error(&mysql));		return -1;	}		 // 将查询结果读取到内存当中，如果数据很多的情况会比较耗内存	res = mysql_store_result(&mysql);	// res = mysql_use_result(&mysql); // 需要用到的时候，每次从服务器中读取一行		// 字段数量	unsigned int field_count = mysql_field_count(&mysql);	printf("field_cout:%d/n",field_count);		// 查询总数	my_ulonglong rows = mysql_num_rows(res);	printf("%lld/n",rows);		// 获取所有字段	fields = mysql_fetch_fields(res);	for (int i = 0; i  10";	flag = mysql_real_query(&mysql, sql, strlen(sql));	if (flag) {		printf("delete data error:%d from %s/n",mysql_errno(&mysql), mysql_error(&mysql));		return -1;	}		my_ulonglong affected_rows = mysql_affected_rows(&mysql);	printf("删除的行数：%lld/n",affected_rows);		printf("success delete %lld record data !/n",affected_rows);	return affected_rows;}void printMySqlInfo(){	const char *stat = mysql_stat(&mysql);	const char *server_info = mysql_get_server_info(&mysql);	const char *clientInfo = mysql_get_client_info();	unsigned long version =	mysql_get_client_version();	const char *hostinfo =	mysql_get_host_info(&mysql);	unsigned long serverversion = mysql_get_server_version(&mysql);	unsigned int protoinfo = mysql_get_proto_info(&mysql);		printf("stat：%s/n",stat);	printf("server_info：%s/n",server_info);	printf("clientInfo：%s/n",clientInfo);	printf("version：%ld/n",version);	printf("hostinfo：%s/n",hostinfo);	printf("serverversion：%ld/n",serverversion);	printf("protoinfo：%d/n",protoinfo);		const char *charactername = mysql_character_set_name(&mysql);	printf("client character set：%s/n",charactername);	if (!mysql_set_character_set(&mysql, "utf8"))	{		printf("New client character set: %s/n",			 mysql_character_set_name(&mysql));	}}</mysql.h></string.h></stdlib.h></stdio.h>