Topic: Applet下通过 prepareStatement 读SQL Server的Image字段内容时,为什么读不出来?

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1.Applet下通过 prepareStatement 读SQL Server的Image字段内容时,为什么读不出来? Copy to clipboard
Posted by: wgz_jz
Posted on: 2004-11-29 14:05

在 Applet下 通过 prepareStatement 来读取SQL Server 中的Image字段内容时,为什么读不出来?InputStream.read总是返回 0,如果出错的话应该返回 -1;InputStream.available()为什么为0?
而同样的代码在 Application下却运行正常,这是为什么?
开发环境为: JBuilder X、JDBC for SQL Server(SP3)

部分具体代码如下:
queryOnePicture = conn.prepareStatement("select 图 from 图表 where 图ID=?");

try {
queryOnePicture.setInt(1,pictureID);
ResultSet result = queryOnePicture.executeQuery();
try {
result.next();
try {
InputStream inputImage = null;
inputImage = result.getBinaryStream(1);
int lengthReaded=-1,positionCurrent=0;
byte[] pictureBuffer = new byte[inputImage.available()+1];
do {
lengthReaded = inputImage.read(pictureBuffer, positionCurrent, inputImage.available());
positionCurrent = positionCurrent + lengthReaded;
} while (lengthReaded != -1);
inputImage.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
finally {
result.close();
}
}
catch(Exception exception) {
exception.printStackTrace();
}


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