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2017.02.21 Mysql 字符集 乱码 排错过程
1，命令行确保以下字符集一致
*1, shell的字符集
*2, connect的字符集
*3, server的字符集
*4, database， table 字符集
MySQL API 编程，命令行确保以下字符集一致
*1, code的字符集
*2, set names utf8
*3, database， table字符集
以下是调用 MySQL API 范例
zhouss@zhouss-Shangqi-X4650/tmp/test$ cat main.c
/*
*1, shell的字符集
*2, connect的字符集
*3, server的字符集
*4, database， table 字符集
*
*1, code的字符集
*2, set names utf8
*3, database， table字符集
* */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mysql/mysql.h>
int main(int argc, char **argv)
{
int lRet = 0;
int lLoop = 0;
int lPos = 0;
int lColumnNum = 0;
MYSQL *hMySQLConnect= NULL;
MYSQL_ROW ppstRow = NULL;
MYSQL_RES *result = NULL;
MYSQL_FIELD *fields = NULL;
char *pszHost = "localhost";
char *pszUser = "root";
char *pszPass = "password"; /* 如果是空，就是空字符 */
char *pszDB = "mysql";
char szBuffer[2048]= {0};
char *ppszQuery[] = {
"SET NAMES UTF8",
"DROP DATABASE IF EXISTS StudentDB",
"CREATE DATABASE StudentDB CHARACTER SET utf8",
"USE StudentDB",
"CREATE TABLE student(id int(2) PRIMARY KEY auto_increment, name varchar(50), email varchar(100)) DEFAULT CHARSET=utf8",
"INSERT INTO student VALUES(1, ‘老王‘, ‘laowang@mail.com‘)",
"INSERT INTO student VALUES(2, ‘张三‘, ‘zhangsan@gmail.com‘)",
"INSERT INTO student VALUES(3, ‘李四‘, ‘lisi@outlook.com‘)",
"INSERT INTO student VALUES(4, ‘李刚‘, ‘ligang@qq.com‘)",
"INSERT INTO student(name, email) VALUES(‘刘翔‘, ‘liuxiang@yview.cn‘)",
"select * from student",
"update student set email=‘liuxiang@cctv.com‘ where name=‘刘翔‘",
"delete from student where name=‘李四‘",
"select * from student",
NULL
};
/* 1, 初始化MySQL handle */
hMySQLConnect = mysql_init(NULL) ;
if (NULL == hMySQLConnect)
{
lRet = mysql_errno(hMySQLConnect) ;
printf("MySQL初始化失败 \n");
return lRet;
}
printf( "MySQL初始化成功 \n");
/* 2, 链接远程MySQL服务器 */
/* MYSQL *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 client_flag) */
hMySQLConnect = mysql_real_connect(hMySQLConnect, pszHost, pszUser, pszPass, pszDB, 0, NULL, 0);
if (NULL == hMySQLConnect)
{
lRet = mysql_errno(hMySQLConnect) ;
printf( "MySQL链接失败 \n");
return lRet;
}
printf( "连接远程MySQL成功 \n");
/* 3, 主循环业务 */
while (1)
{
memset(szBuffer, 0, sizeof(szBuffer));
if( NULL == ppszQuery[lPos] ||
0 == strncmp(ppszQuery[lPos] , "exit" , 4) ||
0 == strncmp(ppszQuery[lPos] , "EXIT" , 4) )
{
break;
}
/* exec SqlQuery */
strncpy(szBuffer, ppszQuery[lPos++], sizeof(szBuffer));
lRet = mysql_query(hMySQLConnect, szBuffer);
if (0 != lRet)
{
lRet = mysql_errno(hMySQLConnect) ;
fprintf( stderr, "MySQL 查询失败 \n");
return lRet;
}
/* select ? */
if (0 == strncmp("select", szBuffer, 6) || 0 == strncmp("SELECT", szBuffer, 6))
{
result = mysql_store_result(hMySQLConnect);
if(NULL == result)
{
break;
}
/* 输出字段名 */
lColumnNum = mysql_field_count(hMySQLConnect) ;
fields = mysql_fetch_fields(result);
memset(szBuffer, 0, sizeof(szBuffer));
for (lLoop = 0; lLoop < lColumnNum; lLoop++)
{
strcat(szBuffer, fields[lLoop].name);
strcat(szBuffer, " ");
}
printf( "%s \n", szBuffer);
/* 输出每行 */
while ((ppstRow = mysql_fetch_row(result)))
{
memset(szBuffer, 0, sizeof(szBuffer));
for (lLoop = 0; lLoop < lColumnNum; lLoop++)
{
strcat(szBuffer, ppstRow[lLoop]);
strcat(szBuffer, " ");
}
printf( "%s \n", szBuffer);
}
mysql_free_result(result);
}
}
/* 关闭MySQL handle */
mysql_close(hMySQLConnect);
printf( "离开MySQL \n");
return lRet;
}
zhouss@zhouss-Shangqi-X4650/tmp/test$ gcc main.c -L /usr/lib/x86_64-linux-gnu/ -lmysqlclient && ./a.out
MySQL初始化成功
连接远程MySQL成功
id name email
1 老王 laowang@mail.com
2 张三 zhangsan@gmail.com
3 李四 lisi@outlook.com
4 李刚 ligang@qq.com
5 刘翔 liuxiang@yview.cn
id name email
1 老王 laowang@mail.com
2 张三 zhangsan@gmail.com
4 李刚 ligang@qq.com
5 刘翔 liuxiang@cctv.com
离开MySQL
zhouss@zhouss-Shangqi-X4650/tmp/test$ mysql -hlocalhost -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 19
Server version: 5.7.17-0ubuntu0.16.04.1 (Ubuntu)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
mysql> show variables like ‘character%‘;
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)
mysql> select * from StudentDB.student;
+----+--------+--------------------+
| id | name | email |
+----+--------+--------------------+
| 1 | 老王 | laowang@mail.com |
| 2 | 张三 | zhangsan@gmail.com |
| 4 | 李刚 | ligang@qq.com |
| 5 | 刘翔 | liuxiang@cctv.com |
+----+--------+--------------------+
4 rows in set (0.00 sec)
mysql> ^DBye
zhouss@zhouss-Shangqi-X4650/tmp/test$本文出自 “魂斗罗” 博客，请务必保留此出处http://990487026.blog.51cto.com/10133282/1899798
2017.02.21 Mysql 字符集 乱码 排错过程
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