我已经创建了一个数据库，并使用以下代码添加了employee表
CREATE TABLE IF NOT EXISTS `employee` (
`Idemployee` int(11) NOT NULL,
`fIrstname` varchar(45) DEFAULT NULL,
`lastname` varchar(45) DEFAULT NULL,
`emaIl` varchar(45) DEFAULT NULL
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;
--
--
--
INSERT INTO `employee` (`Idemployee`, `fIrstname`, `lastname`, `emaIl`) VALUES
(2, 'Pranil', 'kharkar', 'someMail@gmail.com'),
(5, 'prasad', 'kharkar', 'someMail@gmail.com'),
(8, 'prasad', 'kharkar', 'someMail@gmail.com'),
(9, 'prasad', 'kharkar', 'someMail@gmail.com'),
(10, 'Pranil', 'kharkar', 'someMail@gmail.com'),
(11, 'Pranil', 'kharkar', 'someMail@gmail.com'),
(13, 'prasad', 'kharkar', 'someMail@gmail.com'),
(14, 'prasad', 'kharkar', 'someMail@gmail.com'),
(15, 'Murat', 'Kandemir', 'cmkTurkiye@gmail.com'),
(16, 'Murat2', 'Kandemir2', 'cmkTurkiye@gmail.com');
--
--
--
--
ALTER TABLE `employee`
ADD PRIMARY KEY (`Idemployee`);
--
--
--
--
--
--
ALTER TABLE `employee`
MODIFY `Idemployee` int(11) NOT NULL AUTO_INCREMENT,AUTO_INCREMENT=17;
然后创建了jpa项目并在下面创建了这两个代码片段，用于将某人添加到表中;
package com.thejavageek.jpa;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import com.thejavageek.jpa.entities.Employee;
public class Test {
public static void main(String[] args) throws IOException {
/* Create EntityManagerFactory */
EntityManagerFactory emf = Persistence
.createEntityManagerFactory("kurumsaljava");
/* Create and populate Entity */
Employee employee = new Employee();
employee.setFirstname("Ahmet");
employee.setLastname("Mercan");
employee.setEmail("cmkTurkiye@gmail.com");
//employee.setIdEmployee();
/* Create EntityManager */
EntityManager em = emf.createEntityManager();
/* Persist entity */
em.getTransaction().begin();
em.persist(employee);
em.getTransaction().commit();
/* CMK UPDATE
*/
/* Update routines begin*/
/*
int iEdit = 0;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter Employee Number To Edit");
//String iEdit = br.readLine();
try{
iEdit = Integer.parseInt(br.readLine());
}catch(NumberFormatException nfe){
System.err.println("Invalid Format!");
}
employee = em.find(Employee.class, iEdit);
em.getTransaction().begin();
employee.setFirstname("Murat7");
employee.setLastname("Celal");
System.out.println("Employee after updation :- " + employee);
em.getTransaction().commit();
*/
/*Update routines finish*/
// CMK DELETE
/* Delete routines begin*/
/*
int iRemove = 0;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter Employee Number To Remove");
try{
iRemove = Integer.parseInt(br.readLine());
}catch(NumberFormatException nfe){
System.err.println("Invalid Format!");
}
// Remove entity
employee = em.find(Employee.class, iRemove);
System.out.println(employee);
em.getTransaction().begin();
em.remove(employee);
em.getTransaction().commit();
*/
/*Delete routines finish*/
/* CMK
*/
/* Retrieve entity */
/*
employee = em.find(Employee.class, iEdit);
System.out.println(employee);
*/
/* Check whether entity is removed or not */
/*employee = em.find(Employee.class, 1);
System.out.println("Employee after removal :- " + employee);*/
}
}
和Employee.java;
package com.thejavageek.jpa.entities;
import java.io.Serializable;
import javax.persistence.*;
/**
* Entity implementation class for Entity: Employee
*
*/
@Entity
public class Employee implements Serializable {
/**
*
*/
private static final long serialVersionUID = -6984979000774926570L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int idEmployee;
private String email;
private String firstname;
private String lastname;
public Employee() {
}
public int getIdEmployee() {
return this.idEmployee;
}
public void setIdEmployee(int IdEmployee) {
this.idEmployee = IdEmployee;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getFirstname() {
return this.firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return this.lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
@Override
public String toString() {
return "Employee [email=" + email
+ ", firstname=" + firstname + ", lastname=" + lastname + "]";
}
}
和persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="kurumsaljava">
<class>com.thejavageek.jpa.entities.Employee</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/kurumsaljava?useSSL=false" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="" />
</properties>
</persistence-unit>
</persistence>
数据库名称是kurumsaljava。我得到这些错误无法解决它们
[EL Warning]: 2016-04-27 15:45:04.913--UnitOfWork(1576499395)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 '?L, F?RSTNAME, LASTNAME) VALUES ('cmkTurkiye@gmail.com', 'Ahmet', 'Mercan')' at line 1
Error Code: 1064
Call: INSERT INTO EMPLOYEE (EMAİL, FİRSTNAME, LASTNAME) VALUES (?, ?, ?)
bind => [3 parameters bound]
Query: InsertObjectQuery(Employee [email=cmkTurkiye@gmail.com, firstname=Ahmet, lastname=Mercan])
Exception in thread "main" javax.persistence.RollbackException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 '?L, F?RSTNAME, LASTNAME) VALUES ('cmkTurkiye@gmail.com', 'Ahmet', 'Mercan')' at line 1
Error Code: 1064
Call: INSERT INTO EMPLOYEE (EMAİL, FİRSTNAME, LASTNAME) VALUES (?, ?, ?)
bind => [3 parameters bound]
Query: InsertObjectQuery(Employee [email=cmkTurkiye@gmail.com, firstname=Ahmet, lastname=Mercan])
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:157)
at com.thejavageek.jpa.Test.main(Test.java:35)
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 '?L, F?RSTNAME, LASTNAME) VALUES ('cmkTurkiye@gmail.com', 'Ahmet', 'Mercan')' at line 1
Error Code: 1064
Call: INSERT INTO EMPLOYEE (EMAİL, FİRSTNAME, LASTNAME) VALUES (?, ?, ?)
bind => [3 parameters bound]
Query: InsertObjectQuery(Employee [email=cmkTurkiye@gmail.com, firstname=Ahmet, lastname=Mercan])
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:900)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:962)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:631)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:558)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2002)
at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:298)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.insertObject(DatasourceCallQueryMechanism.java:377)
at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:165)
at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:180)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:489)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommit(InsertObjectQuery.java:80)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommitWithChangeSet(InsertObjectQuery.java:90)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:301)
at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:798)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1737)
at org.eclipse.persistence.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:226)
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:125)
at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:4207)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1441)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1531)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:277)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1169)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:132)
... 1 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 '?L, F?RSTNAME, LASTNAME) VALUES ('cmkTurkiye@gmail.com', 'Ahmet', 'Mercan')' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.Util.getInstance(Util.java:387)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:939)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073)
at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009)
at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5094)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:890)
... 32 more
等待你的回答。
答案 0 :(得分：0)
正如RiggsFolly上面所说，我改变了员工类，这部分是我的;
@Override
public String toString() {
return "Employee [email=" + email
+ ", firstname=" + firstname + ", lastname=" + lastname + "]";
}
}
并在persistence.xml的连接字符串中添加了一些内容;
localhost:3306/example?useUnicode=yes&characterEncoding=UTF-8&useSSL=false
它正在运作