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分享不能插入BLOB字段
问题是这样的，我要将一些图片文件存放到数据库的BLOB字段中，当时我发现当图片过小时会插不进数据库，BLOB字段为空，这是什么原因呢？
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dabinzeng 2004-01-04
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兄台，你的回答不对头啊。问题我自己解决了，是写数据库的输出流忘关了。为了奖励的你的参与精神，给你奖励50分，哈哈!
fuzhan820 2003-12-30
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<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*" %>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="java.io.*"%>
<html>
<body>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@10.0.5.36:1521:ycrz2";
Connection con=DriverManager.getConnection(url,"rsgl","rsgl");
//插入数据库
//String sql="insert into test_img values (?,?,?)";
//获取传值ID
String id=request.getParameter("id");
//获取image的路径
String kk=request.getParameter("image");
//转换成file格式
File filename=new File(kk);
//其中mysql为你数据库的名字，user为你连接数据库的用户，password为你连接数据库用户的密码，可自己改
FileInputStream str=new FileInputStream(filename);
String sql="insert into img(id,name,pic) values('"+id+"',?,?)";
PreparedStatement pstmt=con.prepareStatement(sql);
pstmt.setString(1,id);
pstmt.setBinaryStream(2,str,str.available());
pstmt.execute();
out.println("Success,You Have Insert an Image Successfully");
%>
<%@ page import="java.sql.*" %>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="java.io.*"%>
<html>
<body>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@10.0.5.36:1521:ycrz2";
Connection con=DriverManager.getConnection(url,"rsgl","rsgl");
//插入数据库
//String sql="insert into test_img values (?,?,?)";
//获取传值ID
String id=request.getParameter("id");
//获取image的路径
String kk=request.getParameter("image");
//转换成file格式
File filename=new File(kk);
//其中mysql为你数据库的名字，user为你连接数据库的用户，password为你连接数据库用户的密码，可自己改
FileInputStream str=new FileInputStream(filename);
String sql="insert into img(id,name,pic) values('"+id+"',?,?)";
PreparedStatement pstmt=con.prepareStatement(sql);
pstmt.setString(1,id);
pstmt.setBinaryStream(2,str,str.available());
pstmt.execute();
out.println("Success,You Have Insert an Image Successfully");
%>
dabinzeng 2003-12-30
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程序如下：
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@192.168.100.13:1521:develop", "gzedu", "gzedu8756");
conn.setAutoCommit(false);
/* 插入一个空的CLOB对象 */
stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO movie1 (MovieID, MovieName, MoviePicture) VALUES ('1', '1', EMPTY_BLOB())");
/* 查询此CLOB对象并锁定 */
rs = stmt.executeQuery(
"SELECT MoviePicture FROM movie1 WHERE MovieID='1' FOR UPDATE");
if (rs.next()) {
/* 取出此CLOB对象 */
BLOB blob = (BLOB) rs.getBlob("MoviePicture");
/* 向BLOB对象中写入数据 */
BufferedOutputStream out = new BufferedOutputStream(blob.
getBinaryOutputStream());
BufferedInputStream in = new BufferedInputStream(new FileInputStream("screen.bmp"));
int c;
while ( (c = in.read()) != -1) {
out.write(c);
}
in.close();
out.close();
}
/* 正式提交 */
conn.commit();
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@192.168.100.13:1521:develop", "gzedu", "gzedu8756");
conn.setAutoCommit(false);
/* 插入一个空的CLOB对象 */
stmt = conn.createStatement();
stmt.executeUpdate("INSERT INTO movie1 (MovieID, MovieName, MoviePicture) VALUES ('1', '1', EMPTY_BLOB())");
/* 查询此CLOB对象并锁定 */
rs = stmt.executeQuery(
"SELECT MoviePicture FROM movie1 WHERE MovieID='1' FOR UPDATE");
if (rs.next()) {
/* 取出此CLOB对象 */
BLOB blob = (BLOB) rs.getBlob("MoviePicture");
/* 向BLOB对象中写入数据 */
BufferedOutputStream out = new BufferedOutputStream(blob.
getBinaryOutputStream());
BufferedInputStream in = new BufferedInputStream(new FileInputStream("screen.bmp"));
int c;
while ( (c = in.read()) != -1) {
out.write(c);
}
in.close();
out.close();
}
/* 正式提交 */
conn.commit();
