数据库|mysql教程
JDBC,mysql,插入数据
数据库-mysql教程
1.在cmd中进入mysql查看默认的编码格式:
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mysql> show variables like “%char%”;
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若不是utf8(因为我用的是utf8),关掉mysql服务,在my.ini中添加
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[client]default-character-set=utf8[mysqld]default-storage-engine=INNODBcharacter-set-server=utf8collation-server=utf8_general_ci[mysql]default-character-set=utf8
2.eclipse中的编码格式是否为utf8
3.如果还是不可以,检查mysql客户端表格的编码方式
show create table tablename
如果不是utf-8.删掉重新建立一张表(之前我在原表上改动没有成功,可能是我自己操作的原因)
分享一个经典的JDBC连接MySQL的程序
import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class MySQLConnection {public static void main(String[] args) {Connection conn = null;Statement stmt = null;ResultSet rs = null;String url = null;String user = null;String password = null;String sql = null;try {Class.forName("com.mysql.jdbc.Driver"); //加载mysq驱动} catch (ClassNotFoundException e) {System.out.println("驱动加载错误");e.printStackTrace();//打印出错详细信息}try {url = "jdbc:mysql://localhost/test?user=root&password=yqs2602555&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";//简单写法:url = "jdbc:myqsl://localhost/test(数据库名)? user=root(用户)&password=yqs2602555(密码)";user = "root";password = "yqs2602555";conn = DriverManager.getConnection(url,user,password);} catch (SQLException e) {System.out.println("数据库链接错误");e.printStackTrace();}try {stmt = conn.createStatement();sql = "select * from dept";//dept这张表有deptno,deptname和age这三个字段rs = stmt.executeQuery(sql);//执行sql语句while(rs.next()) {System.out.print(rs.getInt("deptno") + " ");System.out.print(rs.getString("deptname") + " ");System.out.println(rs.getInt("age") + " ");}} catch (SQLException e) {System.out.println("数据操作错误");e.printStackTrace();}//关闭数据库try {if(rs != null) {rs.close();rs = null;}if(stmt != null) {stmt.close();stmt = null;}if(conn != null) {conn.close();conn = null;}} catch(Exception e) {System.out.println("数据库关闭错误");e.printStackTrace();}}}
运行结果如下:
1 yqs 0 2 hello 0 3 yqsshr 0 4 world 0 5 hryspa 0 1 yqs 0 2 hello 0 3 yqsshr 0 4 world 0 5 hryspa 0 1 yqs11 21 1 yqs21 31 1 yqs31 41 1 yqs41 51