bboss持久层操作Clob和Blob字段示例
bboss持久层操作Clob和Blob非常方便，基于bboss我们可以非常方便插入、修改和读取clob和blob字段，我们直接看示例：
示例中包含了大数据的增加、删除和修改操作，补充说明一下修改操作：
修改大字段一般在一个事务上下文中先锁定需要修改的记录（采用nowait非阻塞方式锁定），修改完毕后commit事务的同时释放记录的锁，如果有异常，通过finally块中的release方法回滚事务并释放记录锁。
package com.frameworkset.common;
import java.io.File;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.RollbackException;
import org.junit.Test;
import com.frameworkset.common.poolman.CallableDBUtil;
import com.frameworkset.common.poolman.DBUtil;
import com.frameworkset.common.poolman.PreparedDBUtil;
import com.frameworkset.common.poolman.Record;
import com.frameworkset.common.poolman.SQLExecutor;
import com.frameworkset.common.poolman.SQLParams;
import com.frameworkset.common.poolman.handle.FieldRowHandler;
import com.frameworkset.common.poolman.handle.NullRowHandler;
import com.frameworkset.orm.annotation.Column;
import com.frameworkset.orm.transaction.TransactionManager;
import com.frameworkset.util.StringUtil;
/**
*
* <p>Title: TestLob.java</p>
*
* <p>Description:
* CREATE
TABLE TEST
(
BLOBNAME BLOB,
CLOBNAME CLOB,
ID VARCHAR(100)
)
* </p>
*
* <p>Copyright: Copyright (c) 2007</p>
* @Date 2011-12-27 下午2:56:03
* @author biaoping.yin
* @version 1.0
*/
public class TestLob {
public static class LobBean
{
private String id;
@Column(type="blob")//指示属性的值按blob类型写入或者读取
private String blobname;
@Column(type="clob")//指示属性的值按clob类型写入或者读取
private String clobname;
@Column(name="name_")//指示属性名称与表字段名称映射关系，name属性对应于表中的name_字段
private String name;
@Column(dataformat="yyyy-mm-dd")//指示日期类型属性值的存储和读取转换日期格式
private String regdate;
// 。。。。。。
}
@Test
public void testNewSQLParamInsert() throws Exception
{
SQLParams params = new SQLParams();
params.addSQLParam("id", "1", SQLParams.STRING);
// ID,HOST_ID,PLUGIN_ID,CATEGORY_ID,NAME,DESCRIPTION,DATASOURCE_NAME,DRIVER,JDBC_URL,USERNAME,PASSWORD,VALIDATION_QUERY
params.addSQLParam("blobname", "abcdblob",
SQLParams.BLOB);
params.addSQLParam("clobname", "abcdclob",
SQLParams.CLOB);
SQLExecutor.insertBean("insert into test(id,blobname,clobname) values(#[id],#[blobname],#[clobname])", params);
}
@Test
public void testNewBeanInsert() throws Exception
{
LobBean bean = new LobBean();
bean.id = "2";
bean.blobname = "abcdblob";
bean.clobname = "abcdclob";
SQLExecutor.insertBean("insert into test(id,blobname,clobname) values(#[id],#[blobname],#[clobname])", bean);
}
@Test
public void testNewOrMappingQuery() throws Exception
{
// SQLParams params = new SQLParams();
// params.addSQLParam("id", "1", SQLParams.STRING);
// // ID,HOST_ID,PLUGIN_ID,CATEGORY_ID,NAME,DESCRIPTION,DATASOURCE_NAME,DRIVER,JDBC_URL,USERNAME,PASSWORD,VALIDATION_QUERY
// params.addSQLParam("blobname", "abcdblob",
// SQLParams.BLOB);
// params.addSQLParam("clobname", "abcdclob",
// SQLParams.CLOB);
LobBean bean = SQLExecutor.queryObject(LobBean.class,"select * from test");
System.out.println();
}
@Test
public void testNewOrMappingsQuery() throws Exception
{
// SQLParams params = new SQLParams();
// params.addSQLParam("id", "1", SQLParams.STRING);
// // ID,HOST_ID,PLUGIN_ID,CATEGORY_ID,NAME,DESCRIPTION,DATASOURCE_NAME,DRIVER,JDBC_URL,USERNAME,PASSWORD,VALIDATION_QUERY
// params.addSQLParam("blobname", "abcdblob",
// SQLParams.BLOB);
// params.addSQLParam("clobname", "abcdclob",
// SQLParams.CLOB);
List<LobBean> bean = SQLExecutor.queryList(LobBean.class,"select * from test");
System.out.println();
}
/**
* CREATE
TABLE CLOBFILE
(
FILEID VARCHAR(100),
FILENAME VARCHAR(100),
FILESIZE BIGINT,
FILECONTENT CLOB(2147483647)
)
*/
public @Test void uploadClobFile() throws Exception
{
File file = new File("D:\\bbossgroups-3.5.1\\bboss-taglib\\readme.txt");
String sql = "";
try {
sql = "INSERT INTO CLOBFILE (FILENAME,FILECONTENT,fileid,FILESIZE) VALUES(#[filename],#[FILECONTENT],#[FILEID],#[FILESIZE])";
SQLParams sqlparams = new SQLParams();
sqlparams.addSQLParam("filename", file.getName(), SQLParams.STRING);
sqlparams.addSQLParamWithCharset("FILECONTENT", file,SQLParams.CLOBFILE,"GBK");
sqlparams.addSQLParam("FILEID", UUID.randomUUID().toString(),SQLParams.STRING);
sqlparams.addSQLParam("FILESIZE", file.length(),SQLParams.LONG);
SQLExecutor.insertBean(sql, sqlparams);
} catch (Exception ex) {
throw new Exception("上传附件关联临控指令布控信息附件失败：" + ex);
}
}
/**
* CREATE
TABLE CLOBFILE
(
FILEID VARCHAR(100),
FILENAME VARCHAR(100),
FILESIZE BIGINT,
FILECONTENT CLOB(2147483647)
)
*/
public @Test void updateClobFile() throws Exception
{
File file = new File("D:\\bbossgroups-3.5.1\\bboss-taglib\\readme.txt");
String sql = "";
TransactionManager tm = new TransactionManager();
try {
tm.begin();
SQLExecutor.queryField("select 1 as ss from CLOBFILE where fieldid=? for update nowait","11");//锁定记录
sql = "update CLOBFILE set FILECONTENT=#[FILECONTENT]) where fileid = #[FILEID])";
SQLParams sqlparams = new SQLParams();
sqlparams.addSQLParamWithCharset("FILECONTENT", file,SQLParams.CLOBFILE,"GBK");
sqlparams.addSQLParam("FILEID", "11",SQLParams.STRING);
SQLExecutor.updateBean(sql, sqlparams);
tm.commit();
} catch (Exception ex) {
throw new Exception("上传附件关联临控指令布控信息附件失败：" + ex);
}
finally
{
tm.release();
}
}
/**
* 上传附件
* @param inputStream
* @param filename
* @return
* @throws Exception
*/
public boolean uploadFile(InputStream inputStream,long size, String filename) throws Exception {
boolean result = true;
String sql = "";
try {
sql = "INSERT INTO filetable (FILENAME,FILECONTENT,fileid,FILESIZE) VALUES(#[filename],#[FILECONTENT],#[FILEID],#[FILESIZE])";
SQLParams sqlparams = new SQLParams();
sqlparams.addSQLParam("filename", filename, SQLParams.STRING);
sqlparams.addSQLParam("FILECONTENT", inputStream, size,SQLParams.BLOBFILE);
sqlparams.addSQLParam("FILEID", UUID.randomUUID().toString(),SQLParams.STRING);
sqlparams.addSQLParam("FILESIZE", size,SQLParams.LONG);
SQLExecutor.insertBean(sql, sqlparams);
} catch (Exception ex) {
ex.printStackTrace();
result = false;
throw new Exception("上传附件关联临控指令布控信息附件失败：" + ex);
} finally {
if(inputStream != null){
inputStream.close();
}
}
return result;
}
public File getDownloadFile(String fileid) throws Exception
{
try
{
return SQLExecutor.queryTField(
File.class,
new FieldRowHandler<File>() {
@Override
public File handleField(
Record record)
throws Exception
{
// 定义文件对象
File f = new File("d:/",record.getString("filename"));
// 如果文件已经存在则直接返回f
if (f.exists())
return f;
// 将blob中的文件内容存储到文件中
record.getFile("filecontent",f);
return f;
}
},
"select * from filetable where fileid=?",
fileid);
}
catch (Exception e)
{
throw e;
}
}
public File getDownloadClobFile(String fileid) throws Exception
{
try
{
return SQLExecutor.queryTField(
File.class,
new FieldRowHandler<File>() {
@Override
public File handleField(
Record record)
throws Exception
{
// 定义文件对象
File f = new File("d:/",record.getString("filename"));
// 如果文件已经存在则直接返回f
if (f.exists())
return f;
// 将blob中的文件内容存储到文件中
record.getFile("filecontent",f);
return f;
}
},
"select * from CLOBFILE where fileid=?",
fileid);
}
catch (Exception e)
{
throw e;
}
}
public void deletefiles() throws Exception
{
SQLExecutor.delete("delete from filetable ");
SQLExecutor.delete("delete from CLOBFILE ");
}
public List<HashMap> queryfiles() throws Exception
{
return SQLExecutor.queryList(HashMap.class, "select FILENAME,fileid,FILESIZE from filetable");
}
public List<HashMap> queryclobfiles()throws Exception
{
return SQLExecutor.queryList(HashMap.class, "select FILENAME,fileid,FILESIZE from CLOBFILE");
}
public void downloadFileFromBlob(String fileid, final HttpServletRequest request,
final HttpServletResponse response) throws Exception
{
try
{
SQLExecutor.queryByNullRowHandler(new NullRowHandler() {
public void handleRow(Record record) throws Exception
{
StringUtil.sendFile(request, response, record
.getString("filename"), record
.getBlob("filecontent"));
}
}, "select * from filetable where fileid=?", fileid);
}
catch (Exception e)
{
throw e;
}
}
//
public void downloadFileFromClob(String fileid, final HttpServletRequest request,
final HttpServletResponse response) throws Exception
{
try
{
SQLExecutor.queryByNullRowHandler(new NullRowHandler() {
@Override
public void handleRow(Record record) throws Exception
{
StringUtil.sendFile(request, response, record
.getString("filename"), record
.getClob("filecontent"));
}
}, "select * from CLOBFILE where fileid=?", fileid);
}
catch (Exception e)
{
throw e;
}
}
示例中包含了大数据的增加、删除和修改操作，补充说明一下修改操作：
TransactionManager tm = new TransactionManager();
try {
tm.begin();
SQLExecutor.queryField("select 1 as ss from CLOBFILE where fieldid=? for update nowait","11");//锁定记录
sql = "update CLOBFILE set FILECONTENT=#[FILECONTENT]) where fileid = #[FILEID])";
SQLParams sqlparams = new SQLParams();
sqlparams.addSQLParamWithCharset("FILECONTENT", file,SQLParams.CLOBFILE,"GBK");
sqlparams.addSQLParam("FILEID", "11",SQLParams.STRING);
SQLExecutor.updateBean(sql, sqlparams);
tm.commit();//提交修改并释放记录锁
} catch (Exception ex) {
throw new Exception("上传附件关联临控指令布控信息附件失败：" + ex);
}
finally
{
tm.release();//如果有异常，回滚事务，同时释放记录锁
}
修改大字段一般在一个事务上下文中先锁定需要修改的记录（采用nowait非阻塞方式锁定），修改完毕后commit事务的同时释放记录的锁，如果有异常，通过finally块中的release方法回滚事务并释放记录锁。