EJB實體Bean如何和資料庫中表關聯？

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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd"><ejb-jar id="ejb-jar_ID"><display-name>emp_back</display-name><enterprise-beans><entity><display-name>user</display-name><ejb-name>UserInfo</ejb-name><home>com.employee.login.UserHome</home><remote>com.employee.login.User</remote><ejb-class>com.employee.login.UserBean</ejb-class><persistence-type>Container</persistence-type><prim-key-class>java.lang.String</prim-key-class><reentrant>false</reentrant><abstract-schema-name>UserInfo</abstract-schema-name><cmp-field><field-name>id</field-name></cmp-field><cmp-field><field-name>name</field-name></cmp-field><cmp-field><field-name>password</field-name></cmp-field><cmp-field><field-name>relname</field-name></cmp-field><cmp-field><field-name>sex</field-name></cmp-field><cmp-field><field-name>age</field-name></cmp-field><primkey-field>id</primkey-field><query><query-method><method-name>findByNamePassword</method-name><method-params><method-param>java.lang.String</method-param><method-param>java.lang.String</method-param></method-params></query-method><ejb-ql><![CDATA[select Object(user) from UserInfo user where user.name = ?1 and user.password = ?2]]></ejb-ql></query></entity></enterprise-beans></ejb-jar>

上面<ejb-name>用於指定資料庫表名稱。

EJB實體Bean如何和資料庫中表關聯？