jdbc實現MYSQL增刪改查鞏固練習

1.工具類

package com.jdbc.demo;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

public  class JdbcMySqlUtil {
	/**
	 * @param args
	 */
	static{
		//1.註冊驅動
		try {
			Class.forName("com.mysql.jdbc.Driver");
			
		} catch (ClassNotFoundException  e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}				
	}	
	public static Connection getConnection() throws SQLException {
		//2.得到連接
		Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb?user=root&password=7654321");
		return conn;
	}

}

2.增刪改查

package com.jdbc.demo;

import java.sql.Connection;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.PreparedStatement;
public class JdbcMySqlCRUD {
	Connection  conn = null;
	PreparedStatement pstmt = null;	
	ResultSet result = null;
	//1.增加信息
	public void add(int id ,String name,Date birthday) {
		String sql =  "insert into student values(?,?,?)";
		try {
			conn = JdbcMySqlUtil.getConnection();
			pstmt = conn.prepareStatement(sql);
			pstmt.setInt(1, id);
			pstmt.setString(2, name);
			pstmt.setDate(3, birthday);
			pstmt.executeUpdate();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{			
			try {
				pstmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	//2.刪除信息
		public void delete(int id) {
			String sql =  "delete from student where id = ?";
			try {
				conn = JdbcMySqlUtil.getConnection();
				pstmt = conn.prepareStatement(sql);
				pstmt.setInt(1, id);
				pstmt.executeUpdate();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{			
				try {
					pstmt.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		
		//3.更新信息
		public void update(int id ,String name) {
			String sql =  "update student set name=? where id = ?";
			try {
				conn = JdbcMySqlUtil.getConnection();
				pstmt = conn.prepareStatement(sql);
				pstmt.setString(1,name);
				pstmt.setInt(2, id);
				pstmt.executeUpdate();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{			
				try {
					pstmt.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		
		//4.查找信息
		public void select() {
			try {
				conn = JdbcMySqlUtil.getConnection();
				String sql = "select * from student";
				pstmt = conn.prepareStatement(sql);
			    result = pstmt.executeQuery();
			    while(result.next()){
			    	System.err.println(result.getInt("id"));
			    	System.err.println(result.getString("name"));
			    	System.err.println(result.getDate("birthday"));
			    }
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				try {
					pstmt.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}			
		}
}