使用springboot不自動(dòng)初始化數(shù)據(jù)庫(kù)連接池

更新時(shí)間：2021年09月10日 11:14:17 作者：天已青色等煙雨來(lái)

這篇文章主要介紹了使用springboot不自動(dòng)初始化數(shù)據(jù)庫(kù)連接池，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

springboot不自動(dòng)初始化數(shù)據(jù)庫(kù)連接池

簡(jiǎn)介

有時(shí)候我們想自己動(dòng)態(tài)的初始化數(shù)據(jù)庫(kù)連接池，但是springboot 的@SpringBootApplication注解會(huì)自動(dòng)去初始化數(shù)據(jù)庫(kù)連接池，不配置的話會(huì)啟動(dòng)失敗，如下提示

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Dbcp2.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.commons.dbcp2.BasicDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
INFO - Unregistering JMX-exposed beans on shutdown

解決方案

辦法就是排除自動(dòng)初始化的類

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class Application implements CommandLineRunner {
...
}

加上這么一句

(exclude = {DataSourceAutoConfiguration.class})

就可以跳過(guò)數(shù)據(jù)庫(kù)的自動(dòng)初始化，自己為所欲為了~

記錄下spring boot關(guān)于數(shù)據(jù)庫(kù)連接池的一個(gè)小坑

環(huán)境：spring boot 1.5、JDK1.8

application.properties配置

# 驅(qū)動(dòng)配置信息
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/mealsystem?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = 123456
spring.datasource.driverClassName = com.mysql.jdbc.Driver

#連接池的配置信息
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=stat,wall,log4j
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

先找到這個(gè)類

org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder

在下面的源碼中打個(gè)斷點(diǎn)

public DataSource build() {
        Class<? extends DataSource> type = this.getType();
        DataSource result = (DataSource)BeanUtils.instantiate(type);
        this.maybeGetDriverClassName();
        this.bind(result);
        return result;
    }

啟動(dòng)項(xiàng)目

這里寫(xiě)圖片描述

我們可以發(fā)現(xiàn)，在沒(méi)有配置spring.datasource.type時(shí)，spring boot默認(rèn)的連接池是tomcat-jdbc

也就是說(shuō)我們?cè)赼pplication.properties中配置的連接池參數(shù)是無(wú)效的。

好，那我們?cè)倥渲孟逻@個(gè)屬性，使用阿里巴巴的druid

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

再啟動(dòng)下

這里寫(xiě)圖片描述

再來(lái)看看1.5版本org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder的源碼

private static final String[] DATA_SOURCE_TYPE_NAMES = new String[] {
            "org.apache.tomcat.jdbc.pool.DataSource",
            "com.zaxxer.hikari.HikariDataSource",
            "org.apache.commons.dbcp.BasicDataSource", // deprecated
            "org.apache.commons.dbcp2.BasicDataSource" };