url = "jdbc:mysql://localhost/junit_test";
/*Sybase jconnect2.jar */
url = "jdbc:sybase:Tds:host:port";
driver = "com.sybase.jdbc2.SybDriver";
/*Oracle JDBC Thin Driver classes12.zip */
url = "jdbc:oracle:thin:@host:port:sid";
driver = "oracle.jdbc.driver.OracleDriver";
/*Oracle OCI Driver classes12.zip*/
url = "jdbc:oracle:thin:@host:port:sid";
driver = "oracle.jdbc.driver.OracleDriver";
/* OpenBase OpenBaseJDBC.jar (download from www.openbase.com) */
url = "jdbc:openbase://host/database";
driver = "com.openbase.jdbc.ObDriver";
/* MySQL Connector/J from MySql (www.mysql.com)
jdbc classes: mysql-connector-java-2.0.14-bin.jar (download from www.mysql.com) */
url = "jdbc:mysql://host/database";
driver = "com.mysql.jdbc.Driver";
/*JDBC Drivers from Microsoft MSSQL 2000
jdbc classes: msbase.jar, sqlserver.jar, msutil.jar */
url = "jdbc:microsoft:sqlserver://host:port";
driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
/*JSQLConnect from JDBC Drivers from Microsoft MSSQL 2000
jdbc classes: msbase.jar, sqlserver.jar, msutil.jar */
url = "jdbc:microsoft:sqlserver://host:port";
driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
/*DB2 Universal JDBC Driver from IBM
jdbc classes: db2java.zip */
url = "jdbc:db2:host";
driver = "COM.ibm.db2.jdbc.app.DB2Driver";
可以用开源项目实现轻量q接?BR>import com.devdaily.opensource.database.DDConnectionBroker;
String driver = null;
String url = null;
String username = null;
String password = null;
int minConnections = 0;
int maxConnections = 0;
long timeout = 0;
long leaseTime = 0;
String logFile = null;
DDConnectionBroker broker = null;
void setUp() {
/* MySQL With MM JDBC */
driver = "org.gjt.mm.mysql.Driver";
url = "jdbc:mysql://localhost/junit_test";
/*Sybase jconnect2.jar */
url = "jdbc:sybase:Tds:host:port";
driver = "com.sybase.jdbc2.SybDriver";
/*Oracle OCI Driver classes12.zip*/
url = "jdbc:oracle:thin:@host:port:sid";
driver = "oracle.jdbc.driver.OracleDriver";
/* OpenBase OpenBaseJDBC.jar (download from www.openbase.com) */
url = "jdbc:openbase://host/database";
driver = "com.openbase.jdbc.ObDriver";
/* MySQL Connector/J from MySql (www.mysql.com)
jdbc classes: mysql-connector-java-2.0.14-bin.jar (download from www.mysql.com) */
url = "jdbc:mysql://host/database";
driver = "com.mysql.jdbc.Driver";
/*JDBC Drivers from Microsoft MSSQL 2000
jdbc classes: msbase.jar, sqlserver.jar, msutil.jar */
url = "jdbc:microsoft:sqlserver://host:port";
driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
/*JSQLConnect from JDBC Drivers from Microsoft MSSQL 2000
jdbc classes: msbase.jar, sqlserver.jar, msutil.jar */
url = "jdbc:microsoft:sqlserver://host:port";
driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
/*DB2 Universal JDBC Driver from IBM
jdbc classes: db2java.zip */
url = "jdbc:db2:host";
driver = "COM.ibm.db2.jdbc.app.DB2Driver";
/*Oracle JDBC Thin Driver classes12.zip */
url = "jdbc:oracle:thin:@host:port:sid";
driver = "oracle.jdbc.driver.OracleDriver";
username = "";
password = "";
minConnections = 1;
maxConnections = 1;
timeout = 100;
leaseTime = 60000;
logFile = "queryconn.log";
broker = null;
}
try {
// construct the broker
broker = new DDConnectionBroker(driver,
url,
username,
password,
minConnections,
maxConnections,
timeout,
leaseTime,
logFile);
}
catch (SQLException se) {
// could not get a broker; not much reason to go on
System.err.println(se.getMessage());
System.err.println("Could not construct a broker, quitting.");
System.exit( -1);
}
db2?Ujdbcq接方式,我用的是type4(只支?以上的版?,也是直接通过jdbcq接,其他的客L(fng)好象q要安装客户端工P
type4的JDBC驱动:com.ibm.db2.jcc.DB2Driver
url的格?jdbc:db2://{host}:50000/{database name}
包名:db2jcc.jar
q有q接E序一定要用ibm的jdk来运行，要不然出?
]]>
写入Blob字段和写入其它类型字D늚方式非常不同Q因为Blob自n有一个cursorQ你必须使用cursor对blobq行操作Q因而你在写入Blob之前Q必获得cursor才能q行写入Q那么如何获得Blob的cursor呢？
q需要你先插入一个empty的blobQ这创Z个blob的cursorQ然后你再把q个empty的blob的cursor用select查询出来Q这样通过两步操作Q你p得了blob的cursorQ可以真正的写入blob数据了?BR>
看下面的JDBC的demoQ把oraclejdbc.jarq个二进制文件写入数据库表javatest的content字段(q是一个blob型字D?
| import java.sql.*; import java.io.*; import oracle.sql.*; public class WriteBlob { public static void main(String[] args) { try { DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","fankai","fankai"); conn.setAutoCommit(false); BLOB blob = null; PreparedStatement pstmt = conn.prepareStatement("insert into javatest(name,content) values(?,empty_blob())"); pstmt.setString(1,"fankai"); pstmt.executeUpdate(); pstmt.close(); pstmt = conn.prepareStatement("select content from javatest where name= ? for update"); pstmt.setString(1,"fankai"); ResultSet rset = pstmt.executeQuery(); if (rset.next()) blob = (BLOB) rset.getBlob(1); String fileName = "oraclejdbc.jar"; File f = new File(fileName); FileInputStream fin = new FileInputStream(f); System.out.println("file size = " + fin.available()); pstmt = conn.prepareStatement("update javatest set content=? where name=?"); OutputStream out = blob.getBinaryOutputStream(); int count = -1, total = 0; byte[] data = new byte[(int)fin.available()]; fin.read(data); out.write(data); /* byte[] data = new byte[blob.getBufferSize()]; 另一U实现方?节省内存 while ((count = fin.read(data)) != -1) { total += count; out.write(data, 0, count); } */ fin.close(); out.close(); pstmt.setBlob(1,blob); pstmt.setString(2,"fankai"); pstmt.executeUpdate(); pstmt.close(); conn.commit(); conn.close(); } catch (SQLException e) { System.err.println(e.getMessage()); e.printStackTrace(); } catch (IOException e) { System.err.println(e.getMessage()); } } } |
仔细看上例，分三步：(x)
1、插入空blob
| into javatest(name,content) values(?,empty_blob()); |
2、获得blob的cursor
| select content from javatest where name= ? for update; |
注意Q！Q必dfor updateQ这锁定该行，直至该行被修改完毕，保证不生ƈ发冲H?BR>
3、update javatest set content=? where name=
用cursor往数据库写数据
q里面还有一点要提醒大家Q?BR>
JDK1.3带的JDBC2.0规范是不完善的，只有读Blob的接口，而没有写Blob的接口，JDK1.4带的JDBC3.0加入了写Blob的接口。你可以使用JDBC3.0的接口，也可以直接用Oracle的JDBC的APIQ我在上例中使用了Oracle的JDBC的API?BR>
另外要注意的是：(x)
| java.sql.Blob oracle.sql.BLOB |
注意看blob的大写Q是不一L(fng)。写E序的时候不要搞混了?BR>
下面看看用Hibernate怎么写，原理是一L(fng)Q也要分三步Q但是代码简单很?BR>
q是Cat对象定义
| package com.fankai; import java.sql.Blob; public class Cat { private String id; private String name; private char sex; private float weight; private Blob image; public Cat() { } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public char getSex() { return sex; } public void setSex(char sex) { this.sex = sex; } public float getWeight() { return weight; } public void setWeight(float weight) { this.weight = weight; } public Blob getImage() { return image; } public void setImage(Blob image) { this.image = image;} } |
q是Cat.hbm.xml
| Q?xml version="1.0"?Q?BR>Q?DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"Q?BR> Qhibernate-mappingQ?BR>Qclass name="com.fankai.Cat" table="cat"Q?BR>Q?--jcs-cache usage="read-only"/--Q?BR>Qid name="id" unsaved-value="null"Q?BR>Qgenerator class="uuid.hex"/Q?BR>Q?idQ?BR>Qproperty name="name" length="16" not-null="true"/Q?BR>Qproperty name="sex" length="1" not-null="true"/Q?BR>Qproperty name="weight" /Q?BR>Qproperty name="image" /Q?BR>Q?classQ?BR>Q?hibernate-mappingQ?/TD> |
下面是完整的用Hibernate写入Blob的例子，相比JDBCQ已l简单轻村֤了，也不用写那些OracleҎ(gu)的sql了：(x)
| package com.fankai; import java.sql.Blob; import net.sf.hibernate.*; import oracle.sql.*; import java.io.*; public class TestCatHibernate { public static void testBlob() { Session s = null; byte[] buffer = new byte[1]; buffer[0] = 1; try { SessionFactory sf = HibernateSessionFactory.getSessionFactory(); s = sf.openSession(); Transaction tx = s.beginTransaction(); Cat c = new Cat(); c.setName("Robbin"); c.setImage(Hibernate.createBlob(buffer)); s.save(c); s.flush(); s.refresh(c, LockMode.UPGRADE); BLOB blob = (BLOB) c.getImage(); OutputStream out = blob.getBinaryOutputStream(); String fileName = "oraclejdbc.jar"; File f = new File(fileName); FileInputStream fin = new FileInputStream(f); int count = -1, total = 0; byte[] data = new byte[(int)fin.available()]; fin.read(data); out.write(data); fin.close(); out.close(); s.flush(); tx.commit(); } catch (Exception e) { System.out.println(e.getMessage()); } finally { if (s != null) try { s.close(); } catch (Exception e) {} } } } |
]]>
安装?/FONT>
一Q下载安?j2sdk1.4Qwww.sun.com)Q或以上,讄 CLASSPATHQjava_home?
二，下蝲服务器，免费版本的有 tomcat,resin,当然也还?weblogic之类的巨无霸Q不q得看你?sh)脑的配|是否承受的?
q里只以resin来说明，其他的配|都差不多，可以查看各个服务器自带的说明文g?BR>
resin 服务器可以在 caucho.com下蝲Q选择合适的版本Q下载解压羃?yu)可以直接用?BR>
q里resin有一?resin-ee版本Q这个主要是带ejb功能支持的?如果用不到ejbQ一般的p够了?
三，然后是数据库，有很多数据库产品可以选择QDB2,Oracle,MSSQL,MySQL{等太多了。这里我选择MySQLQ不仅因为它是免费的Q而且它的4.0版本在承以前版本的快速稳定的基础上，整合了InnoDB(http://www.innodb.com)先进的事务处理机制。相信伴随着Linux的壮大，它将在商业数据库市场占的一席之地。不q就数据库本w，它还~少子查询等强大功能的支持?BR>安装׃多说了，配置好用户名Q密码?然后可以下?MySQL-Front 来可视化操作数据库?
四，在Java~程上，一个IDE的功能显然不可缺，现在行的IDE很多Q有JBuilder,Eclipse,IntellJ IDEA,JCreator{等Q其?eclipse借着开源东风，依靠强大的插件功能被誉ؓ(f)最有前途的工具QJBuilder从来都最强大功能的java工具Q不q大到我的电(sh)脑实在运行不了，I啊Q可没钱配新?sh)脑。所以我q是喜欢JCreatorQ小巧而又功能不俗Q应付小规模的应用Ԓl有余。编译开发时要想获得提示支持Q需要在 configure--option--JDK Profiles 导入jar文g?BR>
五，一个站点前台的界面开发，当然M开大名鼎鼎?Dreamweaver 了，它支持jspQasp{很多语a的开发。特别是最q的Dreamweaver MX 2004 增强了站点的功能Q可以方便的对一个站点进行控制。面对struts的前台自定义标签Q有一个mxp插g可以用来支持昄sturts的标{。用前q要在编?-标签?里面导入.tld文gQ目前只支持htmlQ和bean 两个标签?BR>
配置?/FONT>
一Qresin虚拟站点配置
| Qhost id='yourweb:8080' app-dir='e:\blog\' class-update-interval='2'Q?BR>Qweb-app id='/'Q?BR>Qdirectory-servlet id='false'/Q? Q?web-appQ?BR>Qerror-log id='log/web-error.log'/Q? QhostQ?/TD> |
然后在定义的目录下面建立站点?
二，Dreamweaver站点的配|就不多说了?BR>
三，Struts的配|?BR>
q里我们使用的是struts1.1,下蝲q解压羃C(f)时文件夹Q就假设是tem文g夹吧?BR>
首先拯tem/lib/下面所有的.tld文g到站点的/WEB-INF/目录下，再拷贝所有的.jar文g?WEB-INF/lib/目录下，最后web.xml文g中的配置差不多如下：(x)
| Q?xml version="1.0" encoding="ISO-8859-1"?Q? Q?DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"Q?BR> Qweb-appQ?BR> QservletQ?BR>Qservlet-nameQactionQ?servlet-nameQ?BR>Qservlet-classQorg.apache.struts.action.ActionServletQ?servlet-classQ?BR>Qinit-paramQ?BR>Qparam-nameQconfigQ?param-nameQ?BR>Qparam-valueQ?WEB-INF/struts-config.xmlQ?param-valueQ?BR>Q?init-paramQ?BR>Qinit-paramQ?BR>Qparam-nameQdebugQ?param-nameQ?BR>Qparam-valueQ?Q?param-valueQ?BR>Q?init-paramQ?BR>Qinit-paramQ?BR>Qparam-nameQdetailQ?param-nameQ?BR>Qparam-valueQ?Q?param-valueQ?BR>Q?init-paramQ?BR>Qload-on-startupQ?Q?load-on-startupQ?BR>Q?servletQ?BR> Qservlet-mappingQ?BR>Qservlet-nameQactionQ?servlet-nameQ?BR>Qurl-patternQ?.doQ?url-patternQ?BR>Q?servlet-mappingQ?BR> Q?-- The Usual Welcome File List --Q?BR>Qwelcome-file-listQ?BR>Qwelcome-fileQindex.jspQ?welcome-fileQ?BR>Q?welcome-file-listQ?BR> Q?-- Struts Tag Library Descriptors --Q?BR>QtaglibQ?BR>Qtaglib-uriQ?tags/struts-beanQ?taglib-uriQ?BR>Qtaglib-locationQ?WEB-INF/struts-bean.tldQ?taglib-locationQ?BR>Q?taglibQ?BR> QtaglibQ?BR>Qtaglib-uriQ?tags/struts-htmlQ?taglib-uriQ?BR>Qtaglib-locationQ?WEB-INF/struts-html.tldQ?taglib-locationQ?BR>Q?taglibQ?BR> QtaglibQ?BR>Qtaglib-uriQ?tags/struts-logicQ?taglib-uriQ?BR>Qtaglib-locationQ?WEB-INF/struts-logic.tldQ?taglib-locationQ?BR>Q?taglibQ?BR> QtaglibQ?BR>Qtaglib-uriQ?tags/struts-nestedQ?taglib-uriQ?BR>Qtaglib-locationQ?WEB-INF/struts-nested.tldQ?taglib-locationQ?BR>Q?taglibQ?BR> QtaglibQ?BR>Qtaglib-uriQ?tags/struts-tilesQ?taglib-uriQ?BR>Qtaglib-locationQ?WEB-INF/struts-tiles.tldQ?taglib-locationQ?BR>Q?taglibQ?BR> Q?web-appQ?/TD> |
四，Hibernate配置
下蝲q拷?lib目录下的
| hibernate2.jar commons-beanutils.jar commons-collections.jar commons-dbcp.jar commons-lang.jar commons-logging.jar commons-pool.jar dom4j.jar cglib-asm.jar connector.jar |
到应用站点的/lib目录下。接下来配置 hibernate.cfg.xml文g
| Q?xml version='1.0' encoding='utf-8'?Q?BR>Q?DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd"Q? Qhibernate-configurationQ?BR>Qsession-factoryQ?BR> Qproperty name="hibernate.connection.url"Q?BR>jdbc:mysql://localhost:3306/yourdatabase Q?propertyQ?BR>Qproperty name="hibernate.connection.driver_class"Q?BR>org.gjt.mm.mysql.Driver Q?propertyQ?BR>Qproperty name="hibernate.connection.username"Q?BR>yourname Q?propertyQ?BR>Qproperty name="hibernate.connection.password"Q?BR>youyrpassword Q?propertyQ?BR> Q??- 是否运行期生成的SQL输出到日志以供调?-Q?BR>Qproperty name="show_sql"QfalseQ?propertyQ?BR> Q?--dialect Q每个数据库都有其对应的Dialet以匹配其q_Ҏ(gu)?-Q?BR>Qpropertyname="dialect"Qnet.sf.hibernate.dialect.MySQLDialectQ?propertyQ?BR>Q??- 事务理cdQ这里我们用JDBC Transaction --Q?BR>Qproperty name="transaction.factory_class"Q?BR>net.sf.hibernate.transaction.JDBCTransactionFactoryQ?propertyQ?BR> Qproperty name="jdbc.batch_size"Q?0Q?propertyQ?BR>Qproperty name="jdbc.use_scrollable_resultset"QtrueQ?propertyQ?BR> Q??映射文g配置Q注意配|文件名必须包含其相对于根的全\?-Q?BR>Qmapping resource="net/seerlog/hbm/Cat.hbm.xml"/Q?BR> Q?session-factoryQ?BR> Q?hibernate-configurationQ?/TD> |
以上配置了数据库q接所用的地址和用户名Q密码等。具体参数的含义请参考官Ҏ(gu)档?BR>
映射文g的内容可以手工来写，也可通过一些工h自动生成?
整个需要两U文Ӟ(x) .hbm.xml配置文g ?.java持久化对?, 两者是怺兌的，.hbm.xml Ҏ(gu)据库的映还需?.javaq个bean来操作。所以整个过E需要首先设计好数据库，然后Ҏ(gu)数据库导?.hbm.xml文g ,然后再导?.java 文g?有很多工具可以实现这个工E，我们q里采用 Middlegen-Hibernate来实?数据库到.hbm.xml文g的{化，用Hibernate-Extension工具包中?hbm2java 来实?.hbm.xml ?.java 文g的{化！
查找关键字?FONT color=#ff0000>!ENTITY”，得到Q?BR>
| Q?DOCTYPE project [ Q?ENTITY database SYSTEM "file:./config/database/hsqldb.xml"Q?BR>]Q?/TD> |
b) Application name
| Qproperty name="name" value="airline"/Q? |
c) 输出目录
查找关键字“name="build.gen-src.dir"”，得到Q?BR>
| Qproperty name="build.gen-src.dir" value="${build.dir}/gen-src"/Q? |
d) 对应代码的Package name
| Qhibernate destination="${build.gen-src.dir}" package="${name}.hibernate" genXDocletTags="false" genIntergratedCompositeKeys="false" javaTypeMapper="middlegen.plugins.hibernate.HibernateJavaTypeMapper" /Q? |
配置完成后，在MiddleGen 根目录下q行antQ就出现MiddleGen的界面：(x)
选择需要的表，单击H口剙的Generate 按钮QMiddleGen 即ؓ(f)我们生成q些数据库表所对应的Hibernate映射文g?
接下来的工作通过Hibernate Extension 来完成，Hibernate Extension 的tools\bin目录下包含三个工P(x)
1Q?hbm2java.bat
Ҏ(gu)映射文g生成对应的POJO。通过MiddleGen 我们已经得到了映文Ӟ下一步就是通过hbm2java.bat工具生成对应的POJO?BR>
2Q?class2hbm.bat
Ҏ(gu)POJO class 生成映射文gQ这个工具很用刎ͼq里也就不再详细介绍?BR>
3Q?ddl2hbm.bat
由数据库导出库表l构Qƈ生成映射文g以及(qing)POJO。这个功能与MiddleGen的功能重叠，但由于目前还不够成熟Q实际上已经被废弃，不再l护Q，提供的功能也有限Q所以我们还是采用MiddleGen生成映射文gQ之后由hbm2javaҎ(gu)映射文g生成POJO 的方式?
q里我们使用W一个hbm2java.batQ利用刚才生成的.hbm.xml文g自动生成 java 文g?
Z使用q个工具Q首先我们需要配|一些参敎ͼ打开tools\bin\setenv.bat 文gQ修改其中的JDBC_DRIVER和HIBERNATE_HOME环境变量Q其指向我们的实际JDBC Driver文g和Hibernate所在目录。同时检查一下环境变量CP中的各个目中是否实际存在，特别?CORELIB%下的jar文gQ某些版本的发行包中Q默认配|中的文件名与实际的文g名有所出入Q如%CORELIB%\commons-logging.jar, 在Hibernate 发行包中Q可能实际的文g名是commons-logging-1.0.3.jarQ诸如此c）?
使用hbm2javaQ根据MiddleGen生成的映文件生成Java 代码Q?BR>
打开Command WindowQ在tools\bin目录下执行：(x)
hbm2java c:\sample\org\hibernate\sample\*.xml --output=c:\sample\
通过以上步骤我们q成了所需要的所有基本配|文件。接下来可以来初始化这些配|啦?
|
|
]]>