Question

我有一个返回Blob的pl / sql过程。这就是我所说的：

CallableStatement cstmt = null;
Blob blob = null;
cstmt = con.prepareCall("{? = call billing.PREQUEST.GetAttachment(?)}");
                                cstmt.registerOutParameter(1,
                                        OracleTypes.BLOB);
cstmt.setInt(2, id);
cstmt.execute();
blob = cstmt.getBlob(1);

现在我想从blob获取文件名。我怎么能这样做？

Answer 1

BLOB列不存储文件名。您需要添加一个类型为VARCHAR2的单独列，用于存储原始文件名。

如果您处理已经包含大量数据的现有数据库，那么您运气不好。文件名未存储，无法恢复。

Answer 2

您需要将Blob更改为File。试试这段代码：

Blob blob = cstmt.getBlob(column);
InputStream in = blob.getBinaryStream();
OutputStream out = new FileOutputStream("OutputFile");
byte[] buff = new byte[4096]; 
int length = 0;

while ((length = in.read(buff)) != -1) {
    out.write(buff, 0, length );
}

// From here, read in the File and just call "getName()"
// Also, make sure to call to close out and in

如何获取blob文件名？

2 个答案: