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本文只介绍几个常用的快捷键
Ctrl+Space // Complete Code, 与输入法冲突, 改为Alt+S
Ctrl+D // 行复制, 或选定字符串复制
Ctrl+Shift+N // 打开文件
Ctrl+J // 插入代码模板
Alt+Insert // Generate, 生成Constructor, setter, getter
Ctrl+O // 覆盖方法
Ctrl+I // 实现方法
Ctrl+Alt+T // Surround With
Ctrl+/ // 行注释
Ctrl+Alt+L // 格式化代码
Alt+F7 // 查找使用情况
Shift+F6 // 重命名
F6 // 移动
Ctrl+Shift+F7 // 显示字符串使用次数
Alt+Delete // 安全删除
映射文件是的生成方式
在HB2.1.x时代, 使用的是middlegen生成hbm, 再通过hbm2java生成pojo
<middlegen appname="${name}" prefsdir="${build.gen-src.dir}" gui="${gui}" databaseurl="${database.url}" initialContextFactory="${java.naming.factory.initial}" providerURL="${java.naming.provider.url}" datasourceJNDIName="${datasource.jndi.name}" driver="${database.driver}" username="${database.userid}" password="${database.password}">
<hibernate destination="${build.gen-src.dir}" package="${name}.hibernate" genXDocletTags="false" genIntergratedCompositeKeys="false" javaTypeMapper="middlegen.plugins.hibernate.HibernateJavaTypeMapper"/></middlegen>
<target name="codegen" depends="middlegen"> <taskdef name="hbm2java" classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask" classpathref="project.classpath"/> <hbm2java output="${build.classes.dir}" classpathref="project.classpath" config="${src.dir}/config.xml"> <fileset dir="${build.gen-src.dir}/maintain/hibernate"> <include name="**/*.hbm.xml"/> </fileset> </hbm2java></target>
<!-- config.xml -->
<codegen> <generate renderer="net.sf.hibernate.tool.hbm2java.BasicRenderer"/></codegen>
到HB3.0.x时代, hbm的定义更灵活, middlegen已不更新, 使用idea手写hbm, pojo(这时已比较熟悉)
下一阶段, 使用Hibernate Annotations(处于Beta状态)
说明:
只介绍ddl --> hbm --> pojo方式
很多hibernate tools是基于eclipse的, 所以没用
Spring+Hibernate中， 集合映射如果使用lazy="true"， 当PO传到View层时， 出现未初始化session已关闭的错误，只能在dao先初始化
parent.getChilds().size();
Spring提供Open Session In View来解决这个问题, 有两种方式
1. Interceptor
<!-- =========== OpenSession In View pattern ==============-->
<bean id="openSessionInViewInterceptor"
class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="interceptors" ref="openSessionInViewInterceptor"/>
<property name="mappings">
<props>
......
</props>
</property>
</bean>
2. Filter
<web-app>
<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate.support.OpenSessionInViewFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
</web-app>
说明： 个人更喜欢用Interceptor方式， filter是在web.xml中定义
有了OpenSessionInView，并不是一切就ok了。简单的crud可以，但对于复杂业务逻辑就要想点法子。
OSIV默认是request per session的, 所以即使没有显式update(po)，Hibernate也会帮你保存的，dao的业务判断就无效，还好有evict()可用。
update code
// Controller
public ModelAndView update() {
p = dao.getVo(id);
bindObject(request);
dao.update(p);
}
// Dao
public Object getVo(id) {
p = getHibernateTemplate().get(clazz, id);
p.getChilds().size();
getHibernateTemplate().evict(p);
return p;
}
public void update(p) {
oldP = getVo(id);
// ++--(oldP);
getHibernateTemplate().update(p);
// ++--(p);
}
idea 5.0还是有些小bug的, 使用起来有点不爽, 5.0.1估计有不少bug fix
下载中,
http://download.jetbrains.com/idea/idea-5.0.1.exe官方的bug fix
IntelliJ IDEA 5.0.1
1. New annotation @NonNls for marking fields, etc. not presented in the UI & not needing localization.
2. The Hard coded string literals inspection/quick fix now available in UI Designer forms.
摘要: Groovy is an agile dynamic language for the Java 2 Platform that has many of the features that people like so much in languages like Python, Ruby and Smalltalk, making them available to Java developer...
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纯JDBC操作, 对某些项目来说, 也许更好, Spring JDBC Framework让你不用关心Connection, Statement, ResultSet.
定义数据源
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName">
<value>java:/comp/env/jdbc/oracle</value>
</property>
</bean> 定义事务管理器
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
定义dao
<bean id="customerDAO" class="com.waterye.dao.impl.CustomerDAOImpl">
<property name="dataSource" ref="dataSource" />
<property name="transactionManager" ref="transactionManager" />
</bean> demo
public class CustomerDaoImpl extends JdbcDaoSupport implements CustomerDAO {
private DataSource dataSource;
pirvate TransactionManager transactionManager;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
public void setTransactionManager(DataSourceTransactionManager transactionManager) {
this.transactionManager = transactionManager;
}
public Map get(Integer id) throws Exception {
String querySql = "select * from customer where id = ?";
return getJdbcTemplate().queryForMap(querySql, new Object[] { id });
}
public void insert(final Map customer) throws Exception {
String seqSql = "select customer_seql.nextval from dual";
String insertSql = "insert into customer (id, code, name, status) values (?, ?, ?, ?)";
TransactionTemplate transactionTemplate = new TransactionTemplate(transactionManager);
transactionTemplate.execute(new TransactionCallbackWithoutResult() {
protected void doInTransactionWithoutResult(TransactionStatus status) {
JdbcTemplate jdbcTemplate = getJdbcTemplate();
int id = jdbcTemplate.queryForInt(seqSql);
Object[] params = new Object[] { new Integer(id), customer.get("code"), customer.get("name"), map.get("status") };
jdbcTemplate.update(insertSql, params);
}
}
}
public void update(final Map customer) throws Exception {
//
}
public void delete(Integer id) throws Exception {
String deleteSql = "delete from customer where id = ?";
TransactionTemplate transactionTemplate = new TransactionTemplate(transactionManager);
transactionTemplate.execute(new TransactionCallbackWithoutResult() {
protected void doInTransactionWithoutResult(TransactionStatus status) {
getJdbcTemplate().update(deleteSql, new Object[] { id });
}
}
}
public List findValidCustomers() throws Exception {
String querySql = "select * from customer where status = 'valid' order by code";
return getJdbcTemplate().query(querySql, new OracleColumnMapRowMapper());
}
}
说明：
1. 没有使用声明性事务, 使用编程式事务
2. 没有使用POJO模式，使用HashMap, (
ActiveMapper还在sandbax状态)
3. OracleColumnMapRowMapper implements RowMapper, 实现oracle风格到java bean风格mapping
如: 字段customer_id 对应rowMap.get("customerId");