java_jdbc_spring框架查询操作简例

Z时代
2024-01-10
分类：综合

本文内容纲要：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();
					}
			}
		}
	}
}