[英]Table not found in JPA with MySQL database
我嘗試使用JPA,EJB和REST服務創建一個示例項目。 服務運行良好,我可以發送Post
和GET
請求。 當我嘗試通過EJB連接插入簡單對象時,出現表未找到錯誤。 我嘗試手動創建表,但無法正常運行
這是我的實體課
雇員
@Entity
@Table(name = "employee")
public class Employee implements Serializable {
@Id
@Column(name = "emp_id")
private int empId;
@Basic(optional = false)
@Column(name = "name", nullable = false, length = 63)
private String name;
@Basic(optional = false)
@Column(name = "email", nullable = false, length = 255)
private String email;
@Basic(optional = false)
@Column(name = "salary", columnDefinition = "integer default 2500")
private int salary;
}
persistence.xml
<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="EmployeePU" transaction-type="JTA">
<class>com.ams.company.Entity.Employee</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/company" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="" />
<property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode"
value="database" />
<property name="eclipselink.ddl-generation-mode" value="ddl_database_generation" />
</properties>
</persistence-unit>
</persistence>
員工經理
@Stateless
public class EmployeeManager {
@PersistenceContext(unitName = "EmployeePU")
private EntityManager entityManager;
public EmployeeManager() {
}
@TransactionAttribute(TransactionAttributeType.REQUIRED)
public boolean addEmployee(Employee employee) {
entityManager.persist(employee);
return true;
}
}
基於以上評論的解決方案:
連接到MySQL服務器時,必須使用MySQL JDBC驅動程序 。
您不能將JDBC驅動程序用於任何其他品牌的數據庫(這種情況下的問題是使用Apache Derby JDBC驅動程序)。
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