1.数据库结构
2.Java工程结构
3.代码
DBUtil.java
package com.mysql.jdbc;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBUtil {
public Connection getConn(){
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/test";
String username = "root";
String password = "123456";
Connection conn = null;
try {
Class.forName(driver);
conn = (Connection) DriverManager.getConnection(url,username,password);
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}
return conn;
}
}
Select.java
package com.mysql.jdbc;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Select {
public void select(int id){
String sql = "select * from content where id = ?";
DBUtil db = new DBUtil();
PreparedStatement pst = null;
ResultSet rs = null;
Connection conn = db.getConn();
try {
pst = conn.prepareStatement(sql);
pst.setInt(1, id);
rs = pst.executeQuery();
while(rs.next()){
System.out.println(rs.getString("id"));
System.out.println(rs.getString("name"));
System.out.println(rs.getString("content"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
测试类Main.java
package com.mysql.jdbc;
public class Main {
public static void main(String args[]){
Select select = new Select();
select.select(2);
}
}
4.输出结果