【Java】JDBC Part5.1 Hikari连接池补充

Hikari Connection Pool Hikari 连接池

HikariCP 官方文档 https://github.com/brettwooldridge/HikariCP

Maven依赖

一般都用8版本

Maven仓库所在地址

https://mvnrepository.com/artifact/com.zaxxer/HikariCP/3.4.5

<dependency>
　　<groupId>com.zaxxer</groupId>
　　<artifactId>HikariCP</artifactId>
　　<version>3.4.2</version>
</dependency>

官方硬编码获取连接

public class HikariTest {

    @Test
    public void hikariTest() throws Exception {
        HikariConfig config = new HikariConfig();
        config.setJdbcUrl("jdbc:mysql:///jdbc_db?serverTimezone=Asia/Shanghai");
        config.setUsername("root");
        config.setPassword("123456");
        config.addDataSourceProperty("cachePrepStmts", "true");
        config.addDataSourceProperty("prepStmtCacheSize", "300");
        config.addDataSourceProperty("prepStmtCacheSqlLimit", "2048");

        HikariDataSource dataSource = new HikariDataSource(config);

        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }
}

因为没有配置SLF4J日志工厂，这里报加载失败信息

上面的硬编码配置还支持了设置连接池的SQL预编译相关

- 开启与编译对象缓存

- 设置缓存个数300

- 设置缓存上限2048个

Hikari也是支持对配置文件读取方式的

但是啊但是啊，官方解释的驱动名很费解，我试了半天都不行

然后在这个博客看到了：http://zetcode.com/articles/hikaricp/

就是说你连MySQL不需要配置驱动的，直接写Url就好了

hikari.properties

jdbcUrl = jdbc:mysql:///jdbc_db?serverTimezone=Asia/Shanghai
dataSource.user = root
dataSource.password = 123456

# 开启SQL预编译对象缓存
dataSource.cachePrepStmts = true
# SQL预编译对象缓存个数 256
dataSource.prepStmtCacheSize = 256
# SQL预编译对象缓存个数上限 512
dataSource.prepStmtCacheSqlLimit = 512

连接测试

    @Test
    public void hikariTest2() throws Exception {
        final String configureFile = "src/main/resources/hikari.properties";
        HikariConfig configure = new HikariConfig(configureFile);
        HikariDataSource dataSource = new HikariDataSource(configure);
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }

封装工具类

public class JdbcHikariUtil {

    private static final DataSource dataSource = new HikariDataSource(new HikariConfig("src/main/resources/hikari.properties"));

    public static Connection getConnection(){
        try {
            return dataSource.getConnection();
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }
}

---

做一个全连接池和原生JDBC的封装工具类

首先是Maven依赖

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.19</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/commons-dbutils/commons-dbutils -->
        <dependency>
            <groupId>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.7</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.7.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-pool2 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
            <version>2.8.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.22</version>
        </dependency>

        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>3.4.2</version>
        </dependency>

然后是各个连接池的配置

原生JDBC　　jdbc.properties

driverClass = com.mysql.cj.jdbc.Driver
url = jdbc:mysql://localhost:3306/jdbc_db?serverTimezone=Asia/Shanghai
user = root
password = 123456

C3P0　　c3p0-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<c3p0-config>
    <!-- 自定义的配置命名-->
    <named-config name="c3p0_xml_config">

        <!-- 四个基本信息 -->
        <property name="driverClass">com.mysql.cj.jdbc.Driver</property>
        <!-- 默认本地可以省略 jdbc:mysql:///jdbc_db?serverTimezone=Asia/Shanghai -->
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/jdbc_db?serverTimezone=Asia/Shanghai</property>
        <property name="user">root</property>
        <property name="password">123456</property>

        <!-- 连接池管理信息 -->

        <!-- 连接对象数不够时，每次申请 迭增的连接数 -->
        <property name="acquireIncrement">5</property>
        <!-- 初始池大小存放的连接对象数 -->
        <property name="initialPoolSize">10</property>
        <!-- 最小连接对象数 -->
        <property name="minPoolSize">10</property>
        <!-- 最大连接对象数，不可超出的范围 -->
        <property name="maxPoolSize">100</property>
        <!-- 最多维护的SQL编译对象个数-->
        <property name="maxStatements">50</property>
        <!-- 每个连接对象最多可使用的SQL编译对象的个数 -->
        <property name="maxStatementsPerConnection">2</property>
    </named-config>
</c3p0-config>

DBCP　　dbcp.properties

driverClassName = com.mysql.cj.jdbc.Driver
url = jdbc:mysql:///jdbc_db?serverTimezone=Asia/Shanghai
username = root
password = 123456

Druid　　druid.properties ，可以共用c3p0，基本一样

driverClassName = com.mysql.cj.jdbc.Driver
url = jdbc:mysql:///jdbc_db?serverTimezone=Asia/Shanghai
username = root
password = 123456

Hikari　　hikari.properties

jdbcUrl = jdbc:mysql:///jdbc_db?serverTimezone=Asia/Shanghai
dataSource.user = root
dataSource.password = 123456

# 开启SQL预编译对象缓存
dataSource.cachePrepStmts = true
# SQL预编译对象缓存个数 256
dataSource.prepStmtCacheSize = 256
# SQL预编译对象缓存个数上限 512
dataSource.prepStmtCacheSqlLimit = 512

完整封装工具类

package cn.dai.util;

import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import org.apache.commons.dbcp2.BasicDataSourceFactory;

import javax.sql.DataSource;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

/**
 * @author ArkD42
 * @file Jdbc
 * @create 2020 - 04 - 24 - 22:04
 */
public class CompleteJdbcUtils {
    private CompleteJdbcUtils(){}

    //private static String driverClass;
    private static String url;
    private static String user;
    private static String password;

    private static DataSource dataSourceFromDBCP;
    private static DataSource dataSourceFromDruid;
    private static final DataSource dataSourceFromC3P0 = new ComboPooledDataSource("c3p0_xml_config");
    private static final DataSource dataSourceFromHikari = new HikariDataSource(new HikariConfig("src/main/resources/hikari.properties"));

    static {
        InputStream originalJdbcStream = CompleteJdbcUtils.class.getClassLoader().getResourceAsStream("jdbc.properties");
        Properties originalJdbcProperties = new Properties();

        InputStream dbcpStream = CompleteJdbcUtils.class.getClassLoader().getResourceAsStream("dbcp.properties");
        Properties dbcpProperties = new Properties();

        InputStream druidStream = CompleteJdbcUtils.class.getClassLoader().getResourceAsStream("druid.properties");
        Properties druidProperties = new Properties();
        try {
            originalJdbcProperties.load(originalJdbcStream);
            //driverClass = originalJdbcProperties.getProperty("driverClass");
            url = originalJdbcProperties.getProperty("url");
            user = originalJdbcProperties.getProperty("user");
            password = originalJdbcProperties.getProperty("password");
            //Class.forName(driverClass);
            //--------------------------------------------------------------------------\\
            dbcpProperties.load( dbcpStream );
            dataSourceFromDBCP = BasicDataSourceFactory.createDataSource(dbcpProperties);
            druidProperties.load( druidStream );
            dataSourceFromDruid = DruidDataSourceFactory.createDataSource(druidProperties);
        } catch ( Exception e) {
            e.printStackTrace();
        }
    }

    // 原生JDBC
    public static Connection getConnectionByOriginalJdbc(){
        try {
            return DriverManager.getConnection(url,user,password);
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

    // C3P0
    public static Connection getConnectionByC3P0(){
        try {
            return dataSourceFromC3P0.getConnection();
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

    // DBCP
    public static Connection getConnectionByDBCP(){
        try {
            return dataSourceFromDBCP.getConnection();
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

    // Druid
    public static Connection getConnectionByDruid(){
        try {
            return dataSourceFromDruid.getConnection();
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

    // Hikari
    public static Connection getConnectionByHikari(){
        try {
            return dataSourceFromHikari.getConnection();
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

    // 资源释放
    public static void releaseResource(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet){
        try{
            if (resultSet != null) resultSet.close();
            if (preparedStatement != null) preparedStatement.close();
            if (connection != null) connection.close();
        } catch (SQLException sqlException){
            sqlException.printStackTrace();
        }
    }
}

测试

    @Test
    public void te5() throws SQLException {
        Connection connectionByOriginalJdbc = CompleteJdbcUtils.getConnectionByOriginalJdbc();
        Connection connectionByC3P0 = CompleteJdbcUtils.getConnectionByC3P0();
        Connection connectionByDBCP = CompleteJdbcUtils.getConnectionByDBCP();
        Connection connectionByDruid = CompleteJdbcUtils.getConnectionByDruid();
        Connection connectionByHikari = CompleteJdbcUtils.getConnectionByHikari();

        Connection[]connections = new Connection[]{
                connectionByOriginalJdbc,
                connectionByC3P0,
                connectionByDBCP,
                connectionByDruid,
                connectionByHikari
        };

        for (Connection connection: connections) {
            System.out.println(connection);
            connection.close();
        }
    }

对应完整工具类封装的一些常用方法

- 增删改　　Update

- 查询单个结果　　queryOne

- 查询多个结果　　queryToList

- 对注入条件的封装

    //  获取SQL预编译对象
    public static PreparedStatement getPreparedStatement(Connection connection,String sql){
        try {
            return connection.prepareStatement(sql);
        } catch (SQLException sqlException) {
            sqlException.printStackTrace();
        }
        return null;
    }

    //  参数注入
    public static void argumentsInject(PreparedStatement preparedStatement,Object[] args){
        for (int i = 0; i < args.length; i++) {
            try {
                preparedStatement.setObject(i+1,args[i]);
            } catch (SQLException sqlException) {
                sqlException.printStackTrace();
            }
        }
    }

    //  转换日期格式
    public static java.sql.Date parseToSqlDate(String patternTime){
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
        java.util.Date date = null;//"1987-09-01"
        try {
            date = simpleDateFormat.parse(patternTime);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return new java.sql.Date(date.getTime());
    }

    //  更新操作
    public static int update(Connection connection,String sql,Object[] args) {
        PreparedStatement preparedStatement = getPreparedStatement(connection, sql);
        if (args != null) argumentsInject(preparedStatement,args);
        try { return preparedStatement.executeUpdate(); }
        catch (SQLException sqlException) { sqlException.printStackTrace(); }
        return 0;
    }

    //  自己封装的查询
    public static <T> List<T> queryToList(Connection connection,Class<T> tClass,String sql,Object[] args){
        PreparedStatement preparedStatement = getPreparedStatement(connection, sql);
        if (args != null) argumentsInject(preparedStatement,args);
        ResultSet resultSet = null;
        try{
            resultSet = preparedStatement.executeQuery();
            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();
            List<T> tList = new ArrayList<T>();
            while(resultSet.next()){
                T t = tClass.newInstance();
                for (int i = 0; i < columnCount; i++) {
                    Object columnValue = resultSet.getObject(i + 1);
                    String columnLabel = metaData.getColumnLabel(i + 1);
                    Field field = tClass.getDeclaredField(columnLabel);
                    field.setAccessible( true );
                    field.set(t,columnValue);
                }
                tList.add(t);
            }
            return tList;
        } catch (Exception e){ e.printStackTrace(); }
        finally { releaseResource(connection,preparedStatement,resultSet); }
        return null;
    }

    //  MapList集合封装
    public static List<Map<String, Object>> queryToList(Connection connection,String sql, Object[] args){
        PreparedStatement preparedStatement = getPreparedStatement(connection, sql);
        if (args != null) argumentsInject(preparedStatement,args);
        ResultSet resultSet = null;
        try{
            resultSet = preparedStatement.executeQuery();
            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();
            List<Map<String,Object>> mapList = new ArrayList<Map<String, Object>>();
            while(resultSet.next()){
                Map<String,Object> row = new HashMap<String, Object>();
                for (int i = 0; i < columnCount; i++) {
                    String columnLabel = metaData.getColumnLabel(i + 1);
                    Object columnValue = resultSet.getObject(i + 1);
                    row.put(columnLabel,columnValue);
                }
                mapList.add(row);
            }
            return mapList;
        }catch (Exception e){ e.printStackTrace(); }
        finally { releaseResource(connection,preparedStatement,resultSet);}
        return null;
    }

    //  反射实现单个查询
    public static <T> T queryOne(Connection connection,Class<T> tClass,String sql,Object[] args){
        PreparedStatement preparedStatement = getPreparedStatement(connection,sql);
        argumentsInject(preparedStatement,args);
        ResultSet resultSet = null;
        try{
           resultSet = preparedStatement.executeQuery();

            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();
            if (resultSet.next()){
               T t = tClass.newInstance();
                for (int i = 0; i < columnCount; i++) {
                    Object columnValue = resultSet.getObject(i + 1);
                    String columnLabel = metaData.getColumnLabel(i + 1);
                    Field field = tClass.getDeclaredField(columnLabel);
                    field.setAccessible( true );
                    field.set(t,columnValue);
                }
               return t;
           }
        }catch (Exception e){ e.printStackTrace();}
        finally { releaseResource(connection,preparedStatement,resultSet);}
        return null;
    }

    //  Map单个查询
    public static Map<String,Object> queryOne(Connection connection,String sql,Object[] args){
        PreparedStatement preparedStatement = getPreparedStatement(connection,sql);
        argumentsInject(preparedStatement,args);
        ResultSet resultSet = null;
        try{
            resultSet = preparedStatement.executeQuery();
            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();
            if (resultSet.next()){
                Map<String,Object> map = new HashMap<String, Object>();
                for (int i = 0; i < columnCount; i++) {
                    Object columnValue = resultSet.getObject(i + 1);
                    String columnLabel = metaData.getColumnLabel(i + 1);
                    map.put(columnLabel,columnValue);
                }
                return map;
            }
        }catch (Exception e){ e.printStackTrace();}
        finally { releaseResource(connection,preparedStatement,resultSet);}
        return null;
    }

    //  求特殊值的通用方法   聚合函数
    public <E> E getValue(Connection connection,String sql,Object[] args){
        PreparedStatement preparedStatement = getPreparedStatement(connection, sql);
        if (args != null) argumentsInject(preparedStatement,args);
        ResultSet resultSet = null;
        try{
            resultSet = preparedStatement.executeQuery();
            if (resultSet.next())return (E)resultSet.getObject(1);;
        } catch (Exception e){ e.printStackTrace(); }
        finally{ CompleteJdbcUtils.releaseResource(connection,preparedStatement,resultSet);}
        return null;
    }