DBUtils 实现增删查改

需要引入jar包

文章链接--------》C3P0连接池

package WEB10_JDBC_Utils;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class C3P0Utils {
	private static ComboPooledDataSource dataSource= new ComboPooledDataSource();
	
	public static DataSource getDataSource() {
		return dataSource;
	}
	public static Connection getConnection() {
		try {
			return dataSource.getConnection();
		} catch (SQLException e) {
			throw new RuntimeException();
		}
	}
}

package JDBCTest;

import org.apache.commons.dbutils.QueryRunner;
import org.junit.Test;

import WEB10_JDBC_Utils.C3P0Utils;

public class TestDBUtils1 {
	
	@Test
	public void add() {
		try {
			QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
			String sql = "insert into user1 values(null,?,?)";
			Object[] params = {"古话","123"};
			int row = qr.update(sql, params);
			if (row > 0) {
				System.out.println("yes");
			} else {
				System.out.println("no");
			}
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}
	
	@Test
	public void UpdateById() {
		try {
			QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
			String sql = "update user1 set password=? where uid=?";
			Object[] params = {"古话","1"};
			int row = qr.update(sql, params);
			if (row > 0) {
				System.out.println("yes");
			} else {
				System.out.println("no");
			}
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}
	
	@Test
	public void DeleteById() {
		try {
			QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
			String sql = "delete from user1 where uid=?";
			Object[] params = {1};
			int row = qr.update(sql, params);
			if (row > 0) {
				System.out.println("yes");
			} else {
				System.out.println("no");
			}
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}
}

 查询需要 bean：

package JDBCBean;

public class User {
	private int uid;
	private String name;
	private String password;
	public int getUid() {
		return uid;
	}
	public void setUid(int uid) {
		this.uid = uid;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
}

 处理结果集：

package JDBCTest;

import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import org.junit.Test;

import JDBCBean.User;
import WEB10_JDBC_Utils.C3P0Utils;

public class DBUtils2 {
	
	@Test
	public void selectAll() {
		try {
			QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
			String sql = "select * from user1";
			List<User> list = qr.query(sql,new BeanListHandler<User>(User.class));
			for(User user : list) {
				System.out.println(user.getName()+":"+user.getPassword());
			}
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}
	
	@Test
	public void selectById() {
		try {
			QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
			String sql = "select * from user1 where uid=?";
			Object[] params = {3};
			User u = qr.query(sql,new BeanHandler<User>(User.class),params);
			System.out.println(u.getName()+":"+u.getPassword());
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}
	
	@Test
	public void selectCount() {
		try {
			QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
			String sql = "select count(*) from user1";
			Object u = qr.query(sql, new ScalarHandler());
			System.out.println(u);
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}
}