JAVA使用JDBC连接MySQL数据库

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1. 在 pom.xml 文件中加入依赖

    <dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId>    <version>6.0.2</version>

2. 编写一个连接、关闭、查询数据库的类

    package com.hu.demo;            import java.sql.Connection;      import java.sql.DriverManager;      import java.sql.PreparedStatement;      import java.sql.SQLException;            public class DBHelper {          public static final String url = "jdbc:mysql://127.0.0.1/student";          public static final String name = "com.mysql.jdbc.Driver";          public static final String user = "root";          public static final String password = "root";                public Connection conn = null;          public PreparedStatement pst = null;                public DBHelper(String sql) {              try {                  Class.forName(name);//指定连接类型                  conn = DriverManager.getConnection(url, user, password);//获取连接                  pst = conn.prepareStatement(sql);//准备执行语句              } catch (Exception e) {                  e.printStackTrace();              }          }                public void close() {              try {                  this.conn.close();                  this.pst.close();              } catch (SQLException e) {                  e.printStackTrace();              }          }      }

3. 编写一个 Demo 类来测试下

    package com.hu.demo;            import java.sql.ResultSet;      import java.sql.SQLException;            public class Demo {                static String sql = null;          static DBHelper db1 = null;          static ResultSet ret = null;                public static void main(String[] args) {              sql = "select *from stuinfo";//SQL语句              db1 = new DBHelper(sql);//创建DBHelper对象                    try {                  ret = db1.pst.executeQuery();//执行语句，得到结果集                  while (ret.next()) {                      String uid = ret.getString(1);                      String ufname = ret.getString(2);                      String ulname = ret.getString(3);                      String udate = ret.getString(4);                      System.out.println(uid + "\t" + ufname + "\t" + ulname + "\t" + udate );                  }//显示数据                  ret.close();                  db1.close();//关闭连接              } catch (SQLException e) {                  e.printStackTrace();              }          }            }

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