目前Spring Boot中默認支持的連接池有dbcp,dbcp2, tomcat, hikari三種連接池。
在springboot1.5之前默認tomcat連接池, 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"
};
spring boot 2.0的版本默認連接池爲HikariCP;
接着我們配置 application.properties
# 驅動配置信息
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
至此,小夥伴們以爲配置已經完成了,但是當我們配置完這些發現並沒有生效。可以通過show processlist 查看mysql 初始化連接上,發現並不是我們想要的連接數,
,最後 通過重寫datasource方法
數據庫連接可以使用DataSource池進行自動配置。
import rt org.apache.tomcat.jdbc.pool.DataSource;
ie;
import rt org.springframework.boot.context.properties.ConfigurationtionProperties;
import rt org.springframework.context.annotation.Bean;
im;
import rt org.springframework.context.annotation.Configurationtion;
import rt org.springframework.context.annotation.PropertySourcource;
@Configuration
@ConfigurationProperties(prefix = "= "spring.datasource")
e")
public class DataSourceConfig {
private String url;
private String username;
private String password;
private int maxTotal;
private int minIdle;
private int maxIdle;
private int initialSize;
private String logAbandoned;
private String removeAbandoned;
private String removeAbandonedTimeout;
private String maxWaitMillis;
private String timeBetweenEvictionRunsMillis;
private String numTestsPerEvictionRun;
private String minEvictableIdleTimeMillis;
@Bean
public DataSource getDataSource() {
DataSource dataSource = new DataSource();
dataSource.setDriverClasClassName("com.mysql.jdbc.Driver");
");
dataSource.setUrl(url(url);
dataSource.setUsername(ume(username);
dataSource.setPassword(prd(password);
dataSource.setMaxActive(ive(maxTotal);
dataSource.setMinIdle(mie(minIdle);
dataSource.setMaxIdle(mae(maxIdle);
dataSource.setInitialSizlSize(initialSize);
return dataSource;
}
//getset方法省略
}
在經過測試 ,發現mysql鏈接確實增加了,纏繞幾天的問題終於解決了,豁然開朗