问题描述
问题描述：我使用的ibatis框架，现在有两个类，一个User一个Template，多对一的关系，即一个用户只能选择一个模板，一个模板可以被多个用户选择。User.classpublic class User {private Long userId;private String email;private String username;private String password;private Template template;//getters and setters...}Template.classpublic class Template {private Long templateId;private String name;//getters and setters...}resultMap<sqlMap namespace="Template"><resultMap id="base" class="Template"> <result column="template_id" property="templateId" /> <result column="name" property="name" /> <result column="path" property="path" /></resultMap></sqlMap><sqlMap namespace="User"><resultMap id="base" class="User"><result column="user_id" property="userId" /><result column="email" property="email" /><result column="username" property="username" /><result column="password" property="password" /><result property="template" resultMap="Template.base" /></resultMap><select id="loginByUsername" parameterClass="User" resultMap="base"><![CDATA[selectuser_id, template_id, email, username, passwordfromuser as uwhereu.password = #password#andu.username = #username#]]></select></sqlMap>如果是这样设置，运行loginByUsername会有以下异常：Exception in thread "main" com.ibatis.common.jdbc.exception.NestedSQLException: --- The error occurred in net/ing100/microblog/po/mapping/Template.xml. --- The error occurred while applying a result map. --- Check the Template.base. --- Check the result mapping for the 'name' property. --- Cause: com.ibatis.sqlmap.client.SqlMapException: Error getting nested result map values for 'template'. Cause: java.sql.SQLException: Column 'name' not found.at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryWithCallback(MappedStatement.java:204)at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryForObject(MappedStatement.java:120)at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:518)at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:493)at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:106)at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForObject(SqlMapClientImpl.java:82)at net.ing100.microblog.dao.impl.UserDAOImpl.loginByEmail(UserDAOImpl.java:12)at net.ing100.microblog.test.dao.TestUserDAO.main(TestUserDAO.java:32)Caused by: com.ibatis.sqlmap.client.SqlMapException: Error getting nested result map values for 'template'. Cause: java.sql.SQLException: Column 'name' not found.at com.ibatis.sqlmap.engine.mapping.result.ResultMap.setNestedResultMappingValue(ResultMap.java:467)at com.ibatis.sqlmap.engine.mapping.result.ResultMap.applyNestedResultMap(ResultMap.java:395)at com.ibatis.sqlmap.engine.mapping.result.ResultMap.setResultObjectValues(ResultMap.java:380)at com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject(RowHandlerCallback.java:64)at com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults(SqlExecutor.java:385)at com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:300)at com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:189)at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.sqlExecuteQuery(MappedStatement.java:221)at com.ibatis.sqlmap.engine.mapping.statement.MappedStatement.executeQueryWithCallback(MappedStatement.java:189)... 7 moreCaused by: java.sql.SQLException: Column 'name' not found.at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)at com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1093)at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5488)at com.mchange.v2.c3p0.impl.NewProxyResultSet.getString(NewProxyResultSet.java:3342)at com.ibatis.sqlmap.engine.type.StringTypeHandler.getResult(StringTypeHandler.java:35)at com.ibatis.sqlmap.engine.mapping.result.ResultMap.getPrimitiveResultMappingValue(ResultMap.java:619)at com.ibatis.sqlmap.engine.mapping.result.ResultMap.getResults(ResultMap.java:345)at com.ibatis.sqlmap.engine.mapping.result.ResultMap.setNestedResultMappingValue(ResultMap.java:454)... 15 more请问像这种查询，template_id如何装配到template.templateId中去，并且不要出什么column'name'的异常？
解决方案
呵呵。。。我觉得你的配置和我的不一样，我研究的也不深，有点模糊，错了请见谅。我的是只有一个<sqlMap>,对应而的几个实体放在<resultMap>里面，查询的语句放在<procedure>里面，通过存储过程去执行的。。