连接MySQL错误:create connection SQLException, url: jdbc:mysql://localhost:3306/*****?

梦里梦外; 2022-04-17 03:22 625阅读 0赞

具体报错如下:

2018-11-12 16:14:21.704 ERROR 9752 --- \[eate-1537371824\] com.alibaba.druid.pool.DruidDataSource   : create connection SQLException, url: jdbc:mysql://localhost:3306/\*\*\*\*\*?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false, errorCode 1193, state HY000

java.sql.SQLException: Unknown system variable 'query\_cache\_size'  
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)  
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)  
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)  
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)  
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)  
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2547)  
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2505)  
    at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1370)  
    at com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3862)  
    at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3290)  
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2299)  
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)  
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795)  
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)  
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)  
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)  
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)  
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)  
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)  
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327)  
    at com.alibaba.druid.filter.FilterChainImpl.connection\_connect(FilterChainImpl.java:156)  
    at com.alibaba.druid.filter.stat.StatFilter.connection\_connect(StatFilter.java:218)  
    at com.alibaba.druid.filter.FilterChainImpl.connection\_connect(FilterChainImpl.java:150)  
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1560)  
    at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1623)  
    at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2468)

解决方法:本人是MySQL版本问题,用的是MySQL8.0,将MySQL驱动改成如下:5.1.6

<dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>

修改后的连接信息如下:

spring:
        datasource:
            type: com.alibaba.druid.pool.DruidDataSource
            driverClassName: com.mysql.jdbc.Driver
            druid:
                first:  #数据源1
                    url: jdbc:mysql://localhost:3306/数据库名称?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8
                    username: *****
                    password: *****

........................

## **or  2020/05/28 加** ##

spring:
      http:
        encoding:
          charset: UTF-8
          force: true
          enabled: true
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
    
        platform: mysql
        url: jdbc:mysql://127.0.0.1:3306/数据库名称?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8
        username: XXXXXX
        password: XXXXXX
        #初始化链接数
        initialSize: 5
        #最小的空闲连接数
        minIdle: 5
        #最大活动连接数
        maxActive: 20
        #从池中取连接的最大等待时间，单位ms
        maxWait: 60000
        #每XXms运行一次空闲连接回收器
        timeBetweenEvictionRunsMillis: 60000
        #池中的连接空闲XX毫秒后被回收
        minEvictableIdleTimeMillis: 300000
        validationQuery: SELECT1FROMDUAL
        testWhileIdle: true
        testOnBorrow: false
        testOnReturn: false
        filters: stat,wall,log4j
        logSlowSql: true