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oracle+jsp中blob类型存储大文本问题解决方法

2009-12-15 15:03 721 查看

oracle+jsp中blob类型存储大文本问题解决方法
oracle 存储大文本一直是一个棘手的问题。
一、存数据库：
<%@page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%
//定义变量
java.sql.Connection conn; //数据库连接对象
String sql;
long id;
ResultSet rs;
Statement stmt,stmt1;

java.sql.DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); //装载JDBC驱动程序
conn = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@192.168.1.2:1521:lqxm","lqxm","lqxm"); //连接数据库

request.setCharacterEncoding("GBK");
String title = request.getParameter("title");
String content = request.getParameter("content");
String sort = request.getParameter("sort");
String type = request.getParameter("type");
String rq = request.getParameter("rq");
String qy = request.getParameter("qy");
//插入数据,此时blob字段中插入的是空值
sql="insert into t_flfg (xlh,title,content,rq,sort,type,qy) ";
sql=sql+"Values(FLFG_SEQ.NEXTVAL,'" + title + "',empty_clob(),'" + rq + "','" + sort + "','" + type + "','" + qy + "')";
stmt=conn.createStatement();
stmt.executeUpdate(sql);
conn.commit();

conn.setAutoCommit(false);
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
//取得刚才插入的ID
sql="select max(xlh) as xlh from t_flfg ";
rs=stmt.executeQuery(sql);
if(rs.next()) {
id=rs.getInt("xlh");
}
rs.close();

sql = "select content from t_flfg where xlh="+id+" for update";
rs = stmt.executeQuery(sql);
if (rs.next()) {
oracle.sql.CLOB clob = (oracle.sql.CLOB)rs.getClob(1);
clob.putString(1, content);
sql = "update t_flfg set content=? where xlh=" + id + ""; //将大文本更新进去，呵呵
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setClob(1, clob);
pstmt.executeUpdate();
}

conn.commit();
stmt.close();
conn.close();
%>

二、检索显示数据：
<%
ResultSet rs = flfgSave.searchOneInfo(request.getParameter("xlh")); //查询数据库获取记录集
rs.next();

int y;
String content = "";
oracle.sql.CLOB clob1;
char ac[] = new char[299];

String title = rs.getString("title");

clob1 = (oracle.sql.CLOB)rs.getObject("content");
Reader reader = clob1.getCharacterStream();
while((y = reader.read(ac, 0, 299)) != -1)
content += new String(ac, 0, y); //这就是取出来的大文本
%>

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