Connection connection; PreparedStatement preparedStatement; connection = JDBCTools.getConnection...Connection connection; PreparedStatement preparedStatement; connection = JDBCTools.getConnection...PreparedStatement preparedStatement = null; ResultSet resultSet = null; connection = JDBCTools.getConnection...ResultSetHandler 组合可以完成大部分的数据操作，减少编码量 package com.jdbc.dao.my.dbutils; import com.jdbc.dao.my.first.test.JDBCTools...void testGetConnection() { // 更新工具类中获取数据库连接的方法，使用 c3p0 数据库连接 Connection connection = JDBCTools.getConnection
Connection connection; PreparedStatement preparedStatement = null; connection = JDBCTools.getConnection...} catch (SQLException e) { e.printStackTrace(); } finally { JDBCTools.releaseUpdate...java.io.IOException; import java.io.InputStream; import java.sql.*; import java.util.Properties; public class JDBCTools...PreparedStatement preparedStatement = null; ResultSet resultSet = null; connection = JDBCTools.getConnection...0; PreparedStatement preparedStatement; ResultSet resultSet; connection = JDBCTools.getConnection
toString() { return "User [id=" + id + ", name=" + name + ", age=" + age + "]"; } } 5.创建JDBCTools...import com.southwind.entity.Student; import com.southwind.util.MyQueryRunner; import com.southwind.util.JDBCTools...; public class Test { public static void main(String[] args) { Connection conn = JDBCTools.getConnection...import com.southwind.entity.User; import com.southwind.util.MyQueryRunner; import com.southwind.util.JDBCTools...; public class Test { public static void main(String[] args) { Connection conn = JDBCTools.getConnection
获取释放数据库连接的工具类：JDBCTools package com.javaweb.userajax.serlet.list.show.tools; import com.mchange.v2...java.sql.SQLException; /** * Created by shkstart on 2017/12/05. */ public class JDBCTools...com.javaweb.userajax.serlet.list.show.dao; import com.javaweb.userajax.serlet.list.show.tools.JDBCTools...public List getList(String sql, Object ... args) { Connection connection = JDBCTools.getConnection... } public T getValue(String sql, Object ... args) { Connection connection = JDBCTools.getConnection
首先我们从获取数据库连接开始，我们使用的是 c3p0 数据库连接池，其配置文件以及获取数据库连接和释放数据库连接的代码如下（项目中的 JDBCTools.java）,这个没有什么可说的，我前面的博文也讲过...DAO.java 1 package com.java.homework.dao; 2 3 import com.java.homework.db.JDBCTools; 4 import...catch (SQLException e) { 53 e.printStackTrace(); 54 }finally { 55 JDBCTools.reledse...catch (SQLException e) { 84 e.printStackTrace(); 85 }finally { 86 JDBCTools.reledse...catch (SQLException e) { 100 e.printStackTrace(); 101 }finally { 102 JDBCTools.reledse
连接数据库的工具类实现 JDBCTools.java 以及配置文件 c3p0-config.xml 1 package com.book.store.db; 2 3 import com.mchange.v2...java.sql.Connection; 7 import java.sql.SQLException; 8 9 /** 10 * 数据库工具类 11 */ 12 public class JDBCTools...1 package com.book.store.impl; 2 3 import com.book.store.dao.Dao; 4 import com.book.store.db.JDBCTools
import java.sql.SQLException; 8 9 /** 10 * Created by shkstart on 2017/12/02. 11 */ 12 public class JDBCTools...} 36 37 public void update(String sql, Object...args) { 38 Connection connection = JDBCTools.getConnection...catch (SQLException e) { 43 e.printStackTrace(); 44 } finally { 45 JDBCTools.releaseConnection...} 47 } 48 49 public List getAll(String sql) { 50 Connection connection = JDBCTools.getConnection
UserDAOImpl implements UserDAO{ @Override public User get(int id) { Connection conn = JDBCTools.getConnection...// TODO Auto-generated catch block e.printStackTrace(); }finally{ JDBCTools.release
领取专属 10元无门槛券
手把手带您无忧上云
云服务器
ICP备案
云直播
对象存储
腾讯会议
