Java 数据库连接池介绍(3)--DBPool 介绍

DBPool 是一个高效易配置的数据库连接池，支持 JDBC 4.2，但目前已经不维护了；本文简单介绍下 DBPool 的使用，文中使用到的软件版本：Java 1.8.0_191、DBPool 7.0.1、Spring Boot 2.3.12.RELEASE。

1、配置参数

参数	描述
name	连接池名称
description	描述
driverClassName	驱动名称
url	连接 url
user	用户名
password	密码
passwordDecoderClassName	密码解密类名，需实现 snaq.db.PasswordDecoder 接口，需要有无参构造方法
minPool	连接池最小连接数
maxPool	连接池最大连接数
maxSize	可以创建的最大连接数
idleTimeout	空闲连接数最大存活时间(秒)，0 表示无限制
loginTimeout	创建连接的超时时间(秒)
validatorClassName	校验类名，需实现 snaq.db.ConnectionValidator 接口，需要有无参构造方法
validatorQuery	校验查询语句

详细说明可参考官网文档：https://www.snaq.net/software/dbpool/

2、使用

2.1、直接使用

2.1.1、引入依赖

<dependency>
    <groupId>net.snaq</groupId>
    <artifactId>dbpool</artifactId>
    <version>7.0.1</version>
</dependency>

2.1.2、使用例子

package com.abc.demo.general.dbpool;

import snaq.db.DBPoolDataSource;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBPoolCase {
    public static void main(String[] args) {
        DBPoolDataSource dbPoolDataSource = new DBPoolDataSource();
        dbPoolDataSource.setName("DBPool连接池");
        dbPoolDataSource.setDescription("DBPool连接池测试");
        dbPoolDataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dbPoolDataSource.setUrl("jdbc:mysql://10.40.9.11:3306/myDb?useUnicode=true&characterEncoding=UTF-8");
        dbPoolDataSource.setUser("root");
        dbPoolDataSource.setPassword("123456");
        dbPoolDataSource.setMinPool(5);
        dbPoolDataSource.setMaxPool(10);
        dbPoolDataSource.setMaxSize(30);
        dbPoolDataSource.setIdleTimeout(3600);
        dbPoolDataSource.setLoginTimeout(60);
        dbPoolDataSource.setValidationQuery("select 1");

        Connection connection = null;
        Statement st = null;
        ResultSet rs  = null;
        try {
            connection = dbPoolDataSource.getConnection();
            st = connection.createStatement();
            rs = st.executeQuery("select version()");
            if (rs.next()) {
                System.out.println(rs.getString(1));
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            close(connection);
        }

        dbPoolDataSource.release();
    }

    private static void close(Connection connection) {
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

2.2、在 SpringBoot 中使用

2.1.1、引入依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.12.RELEASE</version>
    <relativePath />
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>net.snaq</groupId>
        <artifactId>dbpool</artifactId>
        <version>7.0.1</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
</dependencies>

2.1.2、单数据源

application.yml 配置：

spring:
  datasource:
    dbpool:
      name: DBPool连接池
      description: DBPool连接池测试
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://10.40.9.11:3306/myDb?useUnicode=true&characterEncoding=UTF-8
      user: root
      password: 123456
      min-pool: 5
      max-pool: 10
      max-size: 30
      idle-timeout: 3600
      login-timeout: 60
      validator-query: select 1

数据源配置类：

package com.abc.demo.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import snaq.db.DBPoolDataSource;

import javax.sql.DataSource;

@Configuration
public class DataSourceConfig {
    @Bean("dataSource")
    @ConfigurationProperties(prefix = "spring.datasource.dbpool")
    public DataSource dataSource() {
        return DataSourceBuilder.create().type(DBPoolDataSource.class).build();
    }
}

使用：

@Autowired
private DataSource dataSource;

2.1.3、多数据源

application.yml 配置：

spring:
  datasource:
    dbpool:
      db1:
        name: DBPool连接池1
        description: DBPool连接池测试1
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://10.110.74.187:3306/egmp?useUnicode=true&characterEncoding=UTF-8
        user: root
        password: InsYR0ot187!
        min-pool: 5
        max-pool: 10
        max-size: 30
        idle-timeout: 3600
        login-timeout: 60
        validator-query: select 1
      db2:
        name: DBPool连接池2
        description: DBPool连接池测试2
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://10.110.74.187:3306/egmp?useUnicode=true&characterEncoding=UTF-8
        user: root
        password: InsYR0ot187!
        min-pool: 5
        max-pool: 10
        max-size: 30
        idle-timeout: 3600
        login-timeout: 60
        validator-query: select 1

数据源配置类：

package com.abc.demo.config;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import snaq.db.DBPoolDataSource;

import javax.sql.DataSource;

@Configuration
public class DataSourceConfig {
    @Bean("dataSource1")
    @ConfigurationProperties(prefix = "spring.datasource.dbpool.db1")
    public DataSource dataSource1() {
        return DataSourceBuilder.create().type(DBPoolDataSource.class).build();
    }

    @Bean("dataSource2")
    @ConfigurationProperties(prefix = "spring.datasource.dbpool.db2")
    public DataSource dataSource2() {
        return DataSourceBuilder.create().type(DBPoolDataSource.class).build();
    }
}

使用：

@Autowired
@Qualifier("dataSource1")
private DataSource dataSource1;

@Autowired
@Qualifier("dataSource2")
private DataSource dataSource2;