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hibernate操作步骤(代码部分)
1.加载hibernate的核心配置文件
2.创建SessionFactory对象
3.使用SessionFactory创建Session对象
4.开启事务(手动开启)
5.写具体逻辑crud,增删改查操作
6.提交事物
7.关闭资源
代码如下:
1 package com.hui.hibernate; 2 3 import org.hibernate.Session; 4 import org.hibernate.SessionFactory; 5 import org.hibernate.Transaction; 6 import org.hibernate.cfg.Configuration; 7 import org.junit.Test; 8 9 public class HibernateDemo01 { 10 11 public static void main(String[] args) { 12 add(); 13 14 } 15 16 @SuppressWarnings("deprecation") 17 @Test 18 public static void add() { 19 // 1.加载hibernate的核心配置文件 20 Configuration con = new Configuration();//加载配置文件的对象,在src下找到hibernate.cfg.xml文件放到对象中 21 con.configure();//开始加载 22 // 23 // 2.创建SessionFactory对象,读取核心配置文件内容创建SessionFactory,根据映射关系创建表 24 SessionFactory sf = con.buildSessionFactory(); 25 // 3.使用SessionFactory创建Session对象 26 //类似于连接 27 Session se = sf.openSession(); 28 // 4.开启事务(手动开启) 29 Transaction tr = se.beginTransaction(); 30 // 5.写具体逻辑crud,增删改查操作,操作实体类对象 31 User u = new User();//uid不用设置值,他为自增长的主键 32 u.setUsername("刘冬冬"); 33 u.setPassword("123456"); 34 u.setAddress("中国陕西"); 35 //调用Session方法save完成操作 36 se.save(u); 37 38 // 6.提交事物 39 tr.commit(); 40 // 7.关闭资源 41 se.close(); 42 sf.close(); 43 44 } 45 46 }
8.测试,运行报错
报的错误如下
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" org.hibernate.InvalidMappingException: Unable to read XML
at org.hibernate.internal.util.xml.MappingReader.legacyReadMappingDocument(MappingReader.java:375)
at org.hibernate.internal.util.xml.MappingReader.readMappingDocument(MappingReader.java:304)
at org.hibernate.cfg.Configuration.add(Configuration.java:518)
at org.hibernate.cfg.Configuration.add(Configuration.java:514)
at org.hibernate.cfg.Configuration.add(Configuration.java:688)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:771)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2257)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2229)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2209)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2162)
at org.hibernate.cfg.Configuration.configure(Configuration.java:2077)
at org.hibernate.cfg.Configuration.configure(Configuration.java:2056)
at com.hui.hibernate.HibernateDemo01.add(HibernateDemo01.java:21)
at com.hui.hibernate.HibernateDemo01.main(HibernateDemo01.java:12)
Caused by: org.xml.sax.SAXParseException; lineNumber: 22; columnNumber: 40; 必须为元素类型 "id" 声明属性 "colnum"。
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.addDTDDefaultAttrsAndValidate(XMLDTDValidator.java:1253)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1917)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:742)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:380)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2787)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:118)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.hibernate.internal.util.xml.MappingReader.legacyReadMappingDocument(MappingReader.java:325)
... 13 more
原因:如下图红线部分column写成了colnum,所以hibernate不能识别了,因而报错改回来就成了
9.改后测试结果如下:创建了表t_user而且插入了一条数据
hibernate操作步骤(代码部分)
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