java操作Apache druid的实例代码

1. 添加maven依赖包

<dependency> <groupId>org.apache.calcite.avatica</groupId> <artifactId>avatica-core</artifactId> <version>1.15.0</version></dependency>

2. 编写工具类

package com.hnu.druid;import org.apache.calcite.avatica.AvaticaConnection;import org.apache.calcite.avatica.AvaticaStatement;import org.springframework.stereotype.Component;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import java.util.Properties;/** * @description: * @author: YUANHX * @create: 7:11 下午 **/@Componentpublic class DruidJdbcUtil { private static ThreadLocal<AvaticaConnection> threadLocal = new ThreadLocal<>(); private static final String DRUID_URL = 'jdbc:avatica:remote:url=http://172.16.0.160:8888/druid/v2/sql/avatica/'; /** * 打开连接 * @param * @return * @throws SQLException */ public static AvaticaConnection connection() throws SQLException { Properties properties = new Properties(); AvaticaConnection connection = (AvaticaConnection) DriverManager.getConnection(DRUID_URL, properties); threadLocal.set(connection); return connection; } /** * 关闭连接 * @throws SQLException */ public static void closeConnection() throws SQLException{ System.out.println('关闭线程：'+threadLocal.get()); AvaticaConnection conn = threadLocal.get(); if(conn != null){ conn.close(); threadLocal.remove(); } } /** * 根据sql查询结果 * @param * @param sql * @return * @throws SQLException */ public static ResultSet executeQuery (String sql) throws SQLException{ AvaticaStatement statement = connection().createStatement(); ResultSet resultSet = statement.executeQuery(sql); return resultSet; } /*public static Object crud(String sql, Class clazz, List<Object> params) throws SQLException{ AvaticaStatement statement = connection().createStatement(); Object obj = null; for (int i = 0; i < params.size(); i++) { statement.set } return obj; }*/ public static void main(String[] args) { try { String sql = 'SELECT * FROM 'vehicleCondition' limit 20'; for (int i = 0; i < 5; i++) {ResultSet resultSet = executeQuery(sql);System.out.println('开始连接'+i + '; 连接线程：'+threadLocal.get());while(resultSet.next()){ String equipmentCode = resultSet.getString('EquipmentCode'); String vkaCode = resultSet.getString('VKACode');// System.out.println(equipmentCode + ' ; '+ vkaCode);}closeConnection(); } } catch (SQLException throwables) { throwables.printStackTrace(); } }}

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