mysql set max_mysql 使用 limit (方法：setMaxResults )时出错 | 学步园

mysql 使用 limit 时出错

平台：Eclipse 平台：版本：3.0.1，Hibernate Synchronizer 2.3.1，mysql 4.1.9，win2k

数据库表：

CREATE TABLE department (

id INTEGER NOT NULL AUTO_INCREMENT,

name VARCHAR(255) NOT NULL,

PRIMARY KEY (id));

通过 Hibernate Synchronizer 生成 DepartmentDAO.java 并增加方法 find(int,int), 方法代码如下：

public java.util.List find(int firstResult, int maxResults) throws HibernateException {

Criteria criteria = createCriteria();

//第一种方法：

criteria.setFirstResult(firstResult);

criteria = criteria.setMaxResults(maxResults);

//第二种方法：

/*

criteria.add(Expression.sql("limit ?, ?",

new Integer[]{new Integer(firstResult), new Integer(maxResults)},

new Type[]{new IntegerType(), new IntegerType()}));

*/

return criteria.list();

}

这段代码主要用于内容列表分页，但我发现，我只要使用 Criteria 的 setMaxResults 方法时就出错，而没有这个方法或不使用 limit 时就没有错误，生成的 HQL 代码如下：

Hibernate: select this.id as id0_, this.name as name0_ from department this where 1=1 limit ?, ?

也就是说，当语句中存在：limit 关键字时，就会报错，报错内容如下：

testFindintint(com.linqi.test.dao.DepartmentDAOTest)

net.sf.hibernate.exception.SQLGrammarException: Unable to perform find

at net.sf.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:69)

at net.sf.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)

at net.sf.hibernate.impl.SessionImpl.convert(SessionImpl.java:4131)

at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:3663)

at net.sf.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:238)

at com.linqi.test.dao.DepartmentDAO.find(DepartmentDAO.java:26)

at com.linqi.test.dao.DepartmentDAOTest.testFindintint(DepartmentDAOTest.java:63)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:585)

at junit.framework.TestCase.runTest(TestCase.java:154)

at junit.framework.TestCase.runBare(TestCase.java:127)

at junit.framework.TestResult$1.protect(TestResult.java:106)

at junit.framework.TestResult.runProtected(TestResult.java:124)

at junit.framework.TestResult.run(TestResult.java:109)

at junit.framework.TestCase.run(TestCase.java:118)

at junit.framework.TestSuite.runTest(TestSuite.java:208)

at junit.framework.TestSuite.run(TestSuite.java:203)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:421)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:305)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:186)

Caused by: java.sql.SQLException: 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 '?, ?' at line 1

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2851)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1534)

at com.mysql.jdbc.ServerPreparedStatement.serverPrepare(ServerPreparedStatement.java:1485)

at com.mysql.jdbc.ServerPreparedStatement.(ServerPreparedStatement.java:151)

at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1309)

at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1281)

at net.sf.hibernate.impl.BatcherImpl.getPreparedStatement(BatcherImpl.java:263)

at net.sf.hibernate.impl.BatcherImpl.getPreparedStatement(BatcherImpl.java:236)

at net.sf.hibernate.impl.BatcherImpl.prepareQueryStatement(BatcherImpl.java:67)

at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:784)

at net.sf.hibernate.loader.Loader.doQuery(Loader.java:269)

at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:138)

at net.sf.hibernate.loader.Loader.doList(Loader.java:1063)

at net.sf.hibernate.loader.Loader.list(Loader.java:1054)

at net.sf.hibernate.loader.CriteriaLoader.list(CriteriaLoader.java:118)

at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:3660)

... 18 more

整了几天都没有搞好，不得已的情况下，到 www.hibernate.org.cn 论坛发贴后，得到名为“好猪一只”的网友指点后才知道是 jdbc 的问题。我原来使用的 JDBC 版本是 3.1.6，到网上下载了 3.1.7 并安装后，就没有错误了。