查询数据时mybatisplus报错如下 org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: Error preparing statement. Cause: java.lang.NullPointerException 使用环境: shardingsphere-jdbc 5.2.0 mybatis-plus 3.4.3 spring-boot 2.5.0 MGR集群 场景、问题: 查...
mybatis报错 Error preparing statement. Cause: java.lang.NullPointerException二三 2023/08/18 683 1 回复为提高效率,提问时请提供以下信息,问题描述清晰可优先响应。【DM版本】:8 【操作系统】:11【CPU】: 【问题描述】*:在工具中能执行,在项目中报错 SELECT Rankid FROM ( SELECT playerId, vote, rank (...
完整错误如下: nested exception is org.apache.ibatis.executor.ExecutorException: Error preparing statement. Cause: java.lang.ClassCastException: org.apache.shardingsphere.sql.parser.sql.segment.dml.expr.simple.ParameterMarkerExpressionSegment cannot be cast to org.apache.shardingsphere.sql.parser.sql.segmen...
throw new ExecutorException("Error preparing statement. Cause: " + e, e); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 先看下instantiateStatement方法。 (4)instantiateStatement protected Statement instantiateStatement(Connection connection) throws SQLException { if (...
==> Preparing: select * from goods where id = ? ==> Parameters: 2(String) <== Columns: id, name, detail, remark <== Row: 2, title2, null, null <== Total: 1 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 总结:因为查询条件不同,所以是两个不同的statement,生成了两个不同key...
PreparedStatement prepareStatement =null; ResultSet rs =null; try{ // 加载驱动 Class.forName("com.mysql.jdbc.Driver"); // 获取连接 Stringurl ="jdbc:mysql://127.0.0.1:3306/ssmdemo"; Stringuser ="root"; Stringpassword ="123456";
2、${}:底层使用Statement。特点:先进行SQL语句的拼接, 然后再对SQL语句进行编译。存在SQL注入的风险。优先使用#{},这是原则。 避免SQL注入的风险。 二、什么时候使用 ${} 1、当需要往sql语句中,传入关键字时,可以是使用${},比如 前端传递排序字段值 asc或者 desc 案例场景:前台传入排序字段值,该值为mysql...
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: Error preparing statement. Cause: org.apache.shardingsphere.sql.parser.exception.SQLParsingExceptionat org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator....
closeStatement(statement);thrownewExecutorException("Error preparing statement. Cause: " +e, e); } }protectedabstractStatement instantiateStatement(Connection connection)throwsSQLException;/*具体的statement创建交给具体的实现类*/} publicclassPreparedStatementHandlerextendsBaseStatementHandler { ...
closeStatement(statement); thrownew ExecutorException("Error preparing statement. Cause: " + e, e); } } protectedabstract Statement instantiateStatement(Connection connection)throws SQLException; 显然我们通过源码更加关注抽象方法instantiateStatement是做了什么事情。它依旧是一个抽象方法,那么它就有其实现类。那...