使用hibernate跟数据库打交道
hibernate配置文件如下
[html]
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 指定连接数据库所用的驱动 -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- 指定连接数据库的url，hibernate连接的数据库名 -->
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="connection.useUnicode">true</property>
<property name="connection.characterEncoding">utf-8</property>
<!-- 指定连接数据库的用户名 -->
<property name="connection.username">root</property>
<!-- 指定连接数据库的密码 -->
<property name="connection.password">you_password</property>
<!-- C3P0连接池设定 -->
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<!-- 指定连接池里最大连接数 -->
<property name="hibernate.c3p0.max_size">20</property>
<!-- 指定连接池里最小连接数 -->
<property name="hibernate.c3p0.min_size">1</property>
<!-- 指定连接池里连接的超时时长 -->
<property name="hibernate.c3p0.timeout">1800</property>
<!-- 指定连接池里最大缓存多少个Statement对象 -->
<property name="hibernate.c3p0.max_statements">100</property>
<property name="hibernate.c3p0.idle_test_period">500</property>
<property name="hibernate.c3p0.acquire_increment">2</property>
<property name="hibernate.c3p0.validate">true</property>
<property name="hibernate.c3p0.preferredTestQuery ">select 1 </property>
<property name="hibernate.c3p0.idleConnectionTestPeriod ">18000</property>
<property name="hibernate.c3p0.maxIdleTime">25000</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>
<!-- 指定数据库方言 -->
<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<!-- 根据需要自动创建数据库 -->
<property name="hbm2ddl.auto">update</property>
<!-- 显示Hibernate持久化操作所生成的SQL -->
<property name="show_sql">true</property>
<!-- 将SQL脚本进行格式化后再输出 -->
<property name="hibernate.format_sql">true</property>
<mapping resource="test/java/Test.hbm.xml"/>
</session-factory>
</hibernate-configuration>
hibernate映射文件
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<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="test.java.Test" table="test" >
<id name="id" >
<generator class="native"></generator>
</id>
<property name="content" type="java.sql.Blob">
<column name="content" sql-type="blob"></column>
</property>
</class>
</hibernate-mapping>
hibernate实体类
[java]
package test.java;
import java.sql.Blob;
public class Test {
private int id;
private Blob content;
public Blob getContent() {
return content;
}
public void setContent(Blob content) {
this.content = content;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
待序列化的类
[java]
package test.java;
import java.io.Serializable;
public class User implements Serializable{
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
