javaJDBC增删改查

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;

public class JdbcDemo {
	public static void main(String[] args) throws SQLException, ClassNotFoundException{
		
		Statement statement = null;//传递sql语句	
		//1.加载数据库驱动
		Class.forName("com.mysql.jdbc.Driver");
		
		//2.获取数据库的地址，用户名，密码
		String url = "jdbc:mysql://localhost:3306/t1";
		String username = "root";
		String password = "？？？？？？？？";//填写数据库密码
		
		//3.建立一个与数据库的连接
		Connection connection = null;//连接对象
		connection = (Connection) DriverManager.getConnection(url, username, password);	
		statement = (Statement) connection.createStatement();
		
		addData(statement);//增加数据
//		selectData(statement,result);//查询数据
		updateData(statement);//修改数据
		dropData(statement);//删除数据
		
		//关闭连接
		connection.close();
		statement.close();
	}
	
	/**
	 * 查询数据
	 * @throws SQLException 
	 */
	public static void selectData(Statement statement) throws SQLException{
		String string  = "select * from phone";
		//4.执行语句
		ResultSet result = statement.executeQuery(string);
		
		System.out.println("查询最新结果为：");
		while(result.next()){
			String id1 = result.getString(1);
			String s1 = result.getString(2);
			String s2 = result.getString(3);
			String s3 = result.getString(4);
			String s4 = result.getString(5);
			System.out.println("id = "+id1+" name = "+s1+" 价格= "+s2+" 上市时间= "+s3+" 公司= "+s4);
			System.out.println("\t");
		}
	}
	/**
	 * 删除数据
	 * @throws SQLException 
	 */
	public static void dropData(Statement statement) throws SQLException{
		String string = "delete ignore from phone where id=2";
		//执行语句
		@SuppressWarnings("unused")
		Boolean result = statement.execute(string);
		
		System.out.println("删除指定数据后的表为：");
		selectData(statement);
	}
	
	/**
	 * 修改数据
	 * @throws SQLException 
	 */
	public static void updateData(Statement statement) throws SQLException{
		String string = "update ignore phone set name = '未知' where id=1";
		//执行语句
		@SuppressWarnings("unused")
		Boolean result = statement.execute(string);
		
		System.out.println("修改指定数据后的表为：");
		selectData(statement);
	}
	
	/**
	 * 增加数据
	 * @throws SQLException 
	 */
	public static void addData(Statement statement) throws SQLException{
		String string = "insert ignore into phone(id,name,price,上市时间,company) values(8,'诺基亚',3600,'2012-5-9','诺基亚')";
		//执行语句
		@SuppressWarnings("unused")
		Boolean result = statement.execute(string);
		
		System.out.println("增加指定数据后的表为：");		
		selectData(statement);
	}
}

分四步：

1.加载数据库驱动

       Class.forName("com.jdbc.mysql.Driver";

2.获取数据库url，用户名，密码

3.建立数据库连接

      Connection conn = DriverManager.getConnection(url,username,password);

      Statement statement = coon.createStatement();

4.执行语句

      ResultSet res = statement.executeQuery("sql语句")//适用于查询

      或者 Boolean res = statement.execute("sql语句");//适用于增删改

               后使用res.next()进行迭代输出；

5.关闭连接