hql 使用query.list()为空指针异常 ，但是数据库可以查出结果

hql 使用query.list() 为空指针异常 ，但是数据库可以查出结果

解决方法：

hibernate配置中检查数据库的方言是否配置正确

org.hibernate.dialect.OracleDialect

<property name="hibernateProperties">
	<props>
		<prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>
		<prop key="hibernate.show_sql">true</prop>
		<prop key="dynamic-update">true</prop>
		<prop key="hibernate.jdbc.batch_size">0</prop>
	</props>
</property>

给出常见数据库方言

RDBMS	方言
DB2	org.hibernate.dialect.DB2Dialect
DB2 AS/400	org.hibernate.dialect.DB2400Dialect
DB2 OS390	org.hibernate.dialect.DB2390Dialect
PostgreSQL	org.hibernate.dialect.PostgreSQLDialect
MySQL	org.hibernate.dialect.MySQLDialect
MySQL with InnoDB	org.hibernate.dialect.MySQLInnoDBDialect
MySQL with MyISAM	org.hibernate.dialect.MySQLMyISAMDialect
Oracle (any version)	org.hibernate.dialect.OracleDialect
Oracle 9i/10g	org.hibernate.dialect.Oracle9Dialect
Sybase	org.hibernate.dialect.SybaseDialect
Sybase Anywhere	org.hibernate.dialect.SybaseAnywhereDialect
Microsoft SQL Server	org.hibernate.dialect.SQLServerDialect
SAP DB	org.hibernate.dialect.SAPDBDialect
Informix	org.hibernate.dialect.InformixDialect
HypersonicSQL	org.hibernate.dialect.HSQLDialect
Ingres	org.hibernate.dialect.IngresDialect
Progress	org.hibernate.dialect.ProgressDialect
Mckoi SQL	org.hibernate.dialect.MckoiDialect
Interbase	org.hibernate.dialect.InterbaseDialect
Pointbase	org.hibernate.dialect.PointbaseDialect
FrontBase	org.hibernate.dialect.FrontbaseDialect
Firebird	org.hibernate.dialect.FirebirdDialect

本文地址：https://blog.csdn.net/qq_37131913/article/details/110957967