最近搞oracle text的全文检索功能,发现在项目中使用ibatis在查询ctxsys.dr$class这个表时,总是报错,错误如下
com.ibatis.common.jdbc.exception.NestedSQLException: --- The error occurred in com/tc/fts/ibatis/map/CTXSYS_DRCLASS_SqlMap.xml. --- The error occurred while preparing the mapped statement for execution. --- Check the selectDrClass. --- Check the SQL statement. --- Cause: java.util.NoSuchElementException at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188) at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:615) at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:589)
后来才发现表名中含有美元符,而在sqlmap中$是用来替换变量的,是sqlmap中特殊意义的字符,所以直接这么写到sql中肯定是不行的了。
可以考虑使用变量传值的方式,将表名当参数传进来。做了如下更改
调用代码:
ls = sqlMap.queryForList("selectDrClass","ctxsys.dr$class");
sqlmap代码:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd" > <sqlMap namespace="CTXSYS_DRCLASS" > <select id="selectDrClass" resultClass="com.tc.fts.ibatis.model.DrClass" parameterClass="java.lang.String" > <![CDATA[ select * from #temp# order by CLA_ID ]]> </select> </sqlMap>
结果发现ibatis默认将select * from #temp# order by CLA_ID变成了sql语句的参数化形式select * from ? order by CLA_ID,然后调用setString(1)了,这样最后的sql语句中表名被加了引号了。所以还是不行。
尝试直接代换法,这次OK了
调用代码:
dc.setClaName("ctxsys.dr$class"); ls = sqlMap.queryForList("selectDrClass",dc);
sqlmap代码:
<select id="selectDrClass" resultClass="com.tc.fts.ibatis.model.DrClass" parameterClass="com.tc.fts.ibatis.model.DrClass" > <![CDATA[ select * from $claName$ order by CLA_ID ]]> </select>
这样执行的时候sql语句就被正常代换成
select * from ctxsys.dr$class order by CLA_ID
现在又发现一种方法可以这样更符合要求,原谅我之前的做法吧
ls = sqlMap.queryForList("selectDrClass","ctxsys.dr$class");
<select id="selectDrClass" resultClass="com.tc.fts.ibatis.model.DrClass" parameterClass="String"> <![CDATA[ select cla_Id claid,cla_Name claname,cla_Desc cladesc from $value$ order by CLA_ID ]]> </select>