java_jdbc_spring框架查询操作简例

1.添加commons-dbcp-1.4,commons-logging,commons-pool-1.2//线程池,commons.collections-3.2.1.jar,spring.jar

2.利用spring的查询方法和jdbc  "DataSource数据源"

 

package com.ming.www;



import java.sql.ResultSet;

import java.sql.SQLException;



import org.springframework.jdbc.core.BeanPropertyRowMapper;

import org.springframework.jdbc.core.JdbcTemplate;

import org.springframework.jdbc.core.RowMapper;



public class TestDemo1 {



	public static void main(String[] args) {

		// TODO Auto-generated method stub

		User user = new User();

		user = findUser("ccc");

		System.out.println(user.getUsername());

		System.out.println(user.getPassword());

	}



	public static User findUser(String name) {

		JdbcTemplate jdbc = new JdbcTemplate(JdbcUtils.getDatasource());

		String sql = "select id,username,password from t_user where username=?";

		Object[] args = new Object[] { name };

		Object user = jdbc.queryForObject(sql, args, new BeanPropertyRowMapper(User.class));

		return (User) user;

	}

	public static User findUser1(String name) {

		JdbcTemplate jdbc = new JdbcTemplate(JdbcUtils.getDatasource());

		String sql = "select id,username,password from t_user where username=?";

		Object[] args = new Object[] { name };

		Object user = jdbc.queryForObject(sql, args, new RowMapper() {



			@Override

			public Object mapRow(ResultSet rs, int arg1) throws SQLException {

				// TODO Auto-generated method stub

				User user = new User();

				user.setId(rs.getInt("id"));

				user.setUsername(rs.getString("username"));

				user.setPassword(rs.getString("password"));

				return user;

			}



		});

		return (User) user;

	}

}


 

 

 

 

package cn.itcast.www;





import java.io.InputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.Properties;



import javax.sql.DataSource;



import org.apache.commons.dbcp.BasicDataSourceFactory;



public final class JdbcUtils {



	// private static String url = "jdbc:mysql://";

	// private static String user = "";

	// private static String password = "、";



	private static DataSource myDataSource = null;



	public JdbcUtils() {



	}



	static {

		try {

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

			// mydatasource = new MyDataSource();

			Properties prop = new Properties();



			InputStream ins = JdbcUtils.class.getClassLoader()

					.getResourceAsStream("dbcpconfig.properties");

			prop.load(ins);

			myDataSource = BasicDataSourceFactory.createDataSource(prop);



		} catch (Exception e) {

			throw new ExceptionInInitializerError(e);

		}

	}



	public static Connection getConnection() throws SQLException {

		return myDataSource.getConnection();

	}



	public static void free(ResultSet rs, Statement st, Connection conn) {

		try {

			if (rs != null)

				rs.close();

		} catch (SQLException e) {

			e.printStackTrace();

		} finally {

			try {

				if (st != null)

					st.close();

			} catch (SQLException e) {

				e.printStackTrace();

			} finally {

				if (conn != null)

					try {

						conn.close();

						// mydatasource.free(conn);

					} catch (Exception e) {

						e.printStackTrace();

					}

			}

		}

	}

}


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

你可能感兴趣的:(spring)