JDBC 工具类
发布时间:2020-12-15 07:34:14 所属栏目:Java 来源:网络整理
导读:数据池+JdbcTemplate 工具类 package wdnmd.xswl; import com.alibaba.druid.pool.DruidDataSourceFactory; import javax.sql.DataSource; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.ResultSet
数据池+JdbcTemplate 工具类package wdnmd.xswl; import com.alibaba.druid.pool.DruidDataSourceFactory; import javax.sql.DataSource; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; public class JDBCUtil { //定义成员变量DataSourse private static DataSource dataSource; static { try { //加载配置文件 Properties properties = new Properties(); properties.load(JDBCUtil.class.getClassLoader().getResourceAsStream("druid.properties")); //获取DataSource dataSource = DruidDataSourceFactory.createDataSource(properties); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } //获取连接 public static Connection getConnnection() throws SQLException { return dataSource.getConnection(); } //释放资源 public static void close(Statement statement,Connection connection){ close(null,statement,connection); } public static void close(ResultSet resultSet,Statement statement,Connection connection){ if (resultSet != null){ try { resultSet.close(); } catch (SQLException e) { e.printStackTrace(); } } if (statement != null){ try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } if(connection != null){ try { connection.close(); } catch (SQLException e) { e.printStackTrace(); } } } //获取连接池的方法 public static DataSource getDataSource(){ return dataSource; } } propertiesdriver=com.mysql.jdbc.Driver url=jdbc:mysql://127.0.0.1:3306/study?useSSL=true username=wdnmd password=123 initialSize=5 maxActive=10 maxWait=3000 测试package cn.itcast.jdbctemplate; import cn.itcast.utils.JDBCUtils; import org.springframework.jdbc.core.JdbcTemplate; public class JdbcTemplateDemo1 { public static void main(String[] args) { //1.导入jar包 //2.创建JDBCTemplate对象 JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource()); //3.调用方法 String sql = "update account set balance = 5000 where id = ?"; int count = template.update(sql,3); System.out.println(count); } } ? ? ? JDBC工具类package wdnmd.xswl; import java.io.FileReader; import java.io.IOException; import java.net.URL; import java.sql.*; import java.util.Properties; public class JDBCUtils { private static String url; private static String username; private static String password; private static String driver; static { try { //读取资源文件,获取值 Properties properties = new Properties(); ClassLoader classLoader = JDBCUtils.class.getClassLoader(); URL URL = classLoader.getResource("jdbc.properties"); String path = URL.getPath(); properties.load(new FileReader(path)); //获取数据,赋值 url = properties.getProperty("url"); username = properties.getProperty("username"); password = properties.getProperty("password"); driver = properties.getProperty("Driver"); Class.forName(driver); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } } public static Connection getConnection() throws SQLException { return DriverManager.getConnection(url,username,password); } /* 释放资源 */ public static void close(Statement statement,Connection connection){ if (statement != null){ try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } if (connection != null){ try { connection.close(); } catch (SQLException e) { e.printStackTrace(); } } } public static void close(ResultSet resultSet,Connection connection){ if (resultSet != null){ try { resultSet.close(); } catch (SQLException e) { e.printStackTrace(); } } if (statement != null){ try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } if (connection != null){ try { connection.close(); } catch (SQLException e) { e.printStackTrace(); } } } public static void close(ResultSet resultSet,Connection connection){ if (resultSet != null){ try { resultSet.close(); } catch (SQLException e) { e.printStackTrace(); } } if (connection != null){ try { connection.close(); } catch (SQLException e) { e.printStackTrace(); } } } } propertiesDriver = com.mysql.jdbc.Driver url = jdbc:mysql://localhost:3306/study?useSSL=true username = wdnmd password = 123 ? 测试package wdnmd.jdbc; import wdnmd.xswl.JDBCUtils; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; public class JDBCDemo03 { public static void main(String[] args) throws SQLException { Connection connection = JDBCUtils.getConnection(); String sql = "select * from sort"; ResultSet resultSet = connection.prepareStatement(sql).executeQuery(); while (resultSet.next()){ System.out.println(resultSet.getString("sname")); } JDBCUtils.close(resultSet,connection); } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |