Jdbc连接Mysql例子

 

1. 创建数据库

• 指定数据库字符集和校对规则：
• mysql> create database it315 default character set gb2312 collate gb2312_chinese_ci;

2. 进入刚创建的数据库:

• mysql> use it315;
• Database changed

3. 创建表

• mysql> create table student (id int primary key,name varchar(20),address varchar(20));

4. 写一个属性文件: jdbc_mysql.properties , 此文件存储一些连接相关的信息:

• driver=com.mysql.jdbc.Driver             // 驱动名称
• url=jdbc:mysql://localhost:3306/it315    // 指定URL
• user=root                                                 // 用户名
• password=root                                        // 密码
• characterEncoding=gb2312                 // 指定字符编码

5. 写java源文件: JdbcMySql.java

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;
 
public class JdbcMySql {
 
       public static Properties getProperties() {
              Properties props = new Properties();
              InputStream is = null;
              try {
                     is = JdbcMySql.class
                                   .getResourceAsStream("/jdbc_mysql.properties");
                     props.load(is);
              } catch (Exception ex) {
                     ex.printStackTrace();
return null;
              } finally {
                     if (is != null)
                            try {
                                   is.close();
                            } catch (IOException e) {
                                   e.printStackTrace();
                            }
              }
              return props;
       }
 
       public static void main(String[] args) {
              Connection conn = null;
              Statement stmt = null;
              ResultSet rs = null;
 
              Properties props = getProperties();
              if (props != null){
                    // 读取出属性文件里面的内容
                    String driver = props.getProperty("driver");
                    String url = props.getProperty("url");
                     String user = props.getProperty("user");
                    String password = props.getProperty("password");
                    String characterEncoding = props.getProperty("characterEncoding");
 
                    try {
                            Class.forName(driver);// 加载驱动
 
                            conn = DriverManager.getConnection(url + "?characterEncoding="
                                          + characterEncoding, user, password);// 建立连接
                            stmt = conn.createStatement();
 
                            String sql = "insert into student values(1,' 张三','湖南')";
                            stmt.executeUpdate(sql);// 执行sql语句
 
                            sql = "select * from Student";
                            rs = stmt.executeQuery(sql);
 
                            while (rs.next()) {// 从结果集中取出数据
                                   System.out.print(rs.getInt(1) + "\t");
                                   System.out.print(rs.getString(2) + "\t");
                                   System.out.print(rs.getString(3) + "\n");
                            }
 
                     } catch (Exception e) {
                            e.printStackTrace();
                     } finally {// 释放连接
                            try {
                                   if (rs != null)
                                          rs.close();
                                   if (stmt != null)
                                          stmt.close();
                                   if (conn != null)
                                          conn.close();
                            } catch (Exception ex) {
                                   ex.printStackTrace();
                            }
                     }
}
       }
} 

  6.将配置文件和Java文件放在同一目录下，为项目添加Jdbc驱动程序，编译和运行Java文件即可