今天遇到了一個有意思的問題，看錯誤信息提示，好像是有個參數沒有匹配上，具體錯誤信息如下：
Caused by: org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{property='userNumber', mode=IN, javaType=class java.lang.Object, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (2 > number of parameters, which is 1).
at org.apache.ibatis.scripting.defaults.DefaultParameterHandler.setParameters(DefaultParameterHandler.java:89)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.parameterize(PreparedStatementHandler.java:94)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.parameterize(RoutingStatementHandler.java:64)
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:88)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:103)
at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:108)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
at com.sun.proxy.$Proxy239.query(Unknown Source)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
at sun.reflect.GeneratedMethodAccessor432.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
... 41 more
Caused by: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (2 > number of parameters, which is 1).
at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:71)
at org.apache.ibatis.scripting.defaults.DefaultParameterHandler.setParameters(DefaultParameterHandler.java:87)
... 57 more
Caused by: org.apache.ibatis.type.TypeException: Error setting non null for parameter #2 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: java.sql.SQLException: Parameter index out of range (2 > number of parameters, which is 1).
at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:71)
at org.apache.ibatis.type.UnknownTypeHandler.setNonNullParameter(UnknownTypeHandler.java:45)
at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:69)
... 58 more
Caused by: java.sql.SQLException: Parameter index out of range (2 > number of parameters, which is 1).
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:861)
at com.mysql.jdbc.PreparedStatement.checkBounds(PreparedStatement.java:3367)
at com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:3352)
at com.mysql.jdbc.PreparedStatement.setString(PreparedStatement.java:4068)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.setString(DruidPooledPreparedStatement.java:365)
at sun.reflect.GeneratedMethodAccessor415.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:67)
at com.sun.proxy.$Proxy187.setString(Unknown Source)
at org.apache.ibatis.type.StringTypeHandler.setNonNullParameter(StringTypeHandler.java:31)
at org.apache.ibatis.type.StringTypeHandler.setNonNullParameter(StringTypeHandler.java:26)
at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:69)
... 60 more
]
在出現這個錯誤之前，我只進行了一個操作，那就是在mybatis的xml文件中註釋了兩行sql，如下圖：
解決：
去掉註釋或者直接刪除這兩行代碼，問題消失。
說明mybatis在處理xml中這種註釋的時候存在一定的問題。
小注：
我註釋代碼的操作是在idea中通過ctrl+/來操作的 ！！！！
這個錯誤太智障了，花費我很長時間！！！