java basedao，通用增删改查

package com.ts.dao;

import java.sql.*;

public class BaseDao {

	protected Connection conn = null;
	protected PreparedStatement pstmt = null;
	protected ResultSet rs = null;

	
	public void getConnection() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		try {
			conn = DriverManager.getConnection(
					"jdbc:mysql://localhost:3306/ts?useUnicode=true&characterEncoding=utf-8", "root", "ok");
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public void closeAll() {

		try {
			if (rs != null) {
				rs.close();
			}
			if (pstmt != null) {
				pstmt.close();
			}
			if (conn != null) {
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	//通用增删改
	public int executeUpdateSQL(String sql, Object[] param) {
		int num = 0;
		try {
			getConnection();
			pstmt = conn.prepareStatement(sql);
			if (param != null) {
				for (int i = 0; i < param.length; i++) {
					pstmt.setObject(i + 1, param[i]);
				}
			}
			num = pstmt.executeUpdate();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			closeAll();
		}
		return num;
	}
	//通用查询
	public void executeQuerySQL(String sql, Object[] param) {
		try {
			getConnection();
			pstmt = conn.prepareStatement(sql);
			if (param != null) {
				for (int i = 0; i < param.length; i++) {
					pstmt.setObject(i + 1, param[i]);
				}
			}
			rs = pstmt.executeQuery();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}