springboot整合mybatis数据库连接异常!

java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.

今天学习spring boot整合mybatis 并使用driud数据库连接池,照着文档上的代码copy的,但是我这里却出了异常.

异常信息:

Caused by: java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 10 times. Giving up.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:897) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:822) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:447) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:237) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) ~[mysql-connector-java-8.0.17.jar:8.0.17]
	at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:136) ~[HikariCP-3.2.0.jar:na]
	at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:369) ~[HikariCP-3.2.0.jar:na]
	at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:198) ~[HikariCP-3.2.0.jar:na]
	at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:467) ~[HikariCP-3.2.0.jar:na]
	at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:541) ~[HikariCP-3.2.0.jar:na]
	at com.zaxxer.hikari.pool.HikariPool.(HikariPool.java:115) ~[HikariCP-3.2.0.jar:na]
	at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.2.0.jar:na]
	at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:157) ~[spring-jdbc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115) ~[spring-jdbc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78) ~[spring-jdbc-5.1.9.RELEASE.jar:5.1.9.RELEASE]
	... 77 common frames omitted

异常原因: mysql依赖版本问题 :此依赖默认mysql版本过高(我的mysql版本是5.1.37)

      mysql
      mysql-connector-java

解决办法:加上一个版本

     mysql
     mysql-connector-java
     5.1.37

注意配置问题:
如果你的数据库是高版本,比如8.0以上的数据库驱动是com.mysql.cj.jdbc.Driver这个包,并且在数据库的url地址在末尾加上时区，即加上&serverTimezone=GMT

spring:
  datasource: # 数据库配置
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/springboot?useSSL=false&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&autoReconnect=true&failOverReadOnly=false&maxReconnects=10&serverTimezone=GMT
    username: root
    password: root

如果是低版本就是com.mysql.jdbc.Driver这个包(我的是5.1.37)

spring:
  datasource: # 数据库配置
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/springboot?useSSL=false&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&autoReconnect=true&failOverReadOnly=false&maxReconnects=10
    username: root
    password: root

重新启动并测试:

问题解决!