6.封装对数据库CRUD操作的工具类

工具类

package cn.cc.mvc.util;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

public class DbUtil {
	private static Connection con=null;
	
	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		try {
			con = DriverManager.getConnection("jdbc:mysql://localhost:3306/day7","root","cuichen975541045");
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	//执行insert update delete语句的方法,sql中无?
	public int executeOper(String sql) {
		PreparedStatement pstm = null;
		int result = 0;
		try {
			pstm = con.prepareStatement(sql);
			result = pstm.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	//执行insert update delete语句的方法,sql语句中有?
	public int executeOper(String sql,List