Unknown initial character set index '255' received from server. Initial client character set can be forced via the 'characterEncoding' property. 从错误的提示信息中发现字符集设置出现问题 mysql连接数据库时报此错误: //String url = "jdbc:mysql://localhost:3306/db_cjky" 如果使用这句就会报…

Error connecting to database: (using class org.gjt.mm.mysql.Driver)Unknown initial character set index ‘255’ received from server. Initial client character set can be forced via the ‘characterEncoding’ property.问题分析:如果etl调度服务lib下存在多个版本的mysql驱动,则提示上述问…

解决方案: 首先查看数据库的版本号,删除旧的jar包,将mysql-connector-java.jar更换成对应版本号 同时在连接数据库的url后加上?useUnicode=true&characterEncoding=utf-8…

参考 https://www.jianshu.com/p/d86de6463cbd…

mysql的连接错误,在网上查找到是编码不匹配的原因, 直接在连接的URL后加上?useUnicode=true&characterEncoding=utf8就可以了…

连接mysql时一直出现以下的错误: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception…

报错信息: java.sql.SQLException: Unknown column 'user0_.user_name' in 'field list'Query is: select user0_.id as id1_0_, user0_.user_name as user_nam2_0_, user0_.password as password3_0_ from user user0_java thread: http-nio-8881-exec-1 Hibernate报错:说表里没有u…

先是报错255,这个时候需要把 jdbc:mysql://localhost:3306/projUse 写成 jdbc:mysql://localhost:3306/projUse?useUnicode=true&characterEncoding=utf8 后来报错 java.sql.SQLException: Unknown system variable 'tx_isolation' 解决办法: 在pom.xml文件中将MySQL Connector / J版本升级为8: <!-- M…

问题分析 :mysql-connector-java的版本太低,数据库的版本太高 因此将mysql-connector-java升级到最新版本就解  .或者降低MySQL的版本.我之前用的是8.0版本的MySQL,改为5.5的就没事!!!!!…

改为 <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency>…