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**问题描述:**Error querying database. Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax;
**报错:**Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'username=‘Xxx’太大意了, SQL字符创拼接 and没有填写,一直报SQL语法错误!
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