我创建了一个Derby数据库，创建了一个包含BLOB列'pic'作为其中一列的表。
现在我正在尝试将.jpg文件从本地存储到此BLOB字段。 我已经编写了下面的代码，我试图用本地Image更新每一行的BLOB列，然后再次读取该表并获取BLOB并将其存储在本地文件夹中。
public static void main(String[] args) {
try {
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
String dbURL = "jdbc:derby:D:/software/derby/derby/bin/MyDbTest";
Connection conn1 = DriverManager.getConnection(dbURL);
if (conn1 != null) {
System.out.println("Connected to database #1");
}
PreparedStatement stmt = conn1
.prepareStatement("update PRACTICEEMPLOYEEDB set pic = ?");
File f1 =new File(
"D:\\Users\\abkale\\Downloads\\asd.jpg");
InputStream in = new FileInputStream(f1);
stmt.setBinaryStream(1, in,f1.length());
stmt.execute(); //LINE 1 :Place where exception in being thrown
conn1.commit();
Statement s = conn1.createStatement();
ResultSet rs1=s.executeQuery("select * from practiceemployeedb");
int i=0;
while(rs1.next()){
//Some code to read columns and print/store
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
但是在上面的代码中，我在//LINE 1 ::
Connected to database #1
java.sql.SQLException: An unexpected exception was thrown
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(Unknown Source)
at derby.ConnectionProvider.main(ConnectionProvider.java:33)
Caused by: ERROR XSDA4: An unexpected exception was thrown
at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
at org.apache.derby.impl.jdbc.SQLExceptionFactory.wrapArgsForTransportAcrossDRDA(Unknown Source)
... 11 more
Caused by: java.io.EOFException: Stream has already been read and end-of-file reached and cannot be re-used.
at org.apache.derby.iapi.types.RawToBinaryFormatStream.read(Unknown Source)
at org.apache.derby.impl.store.raw.data.MemByteHolder.write(Unknown Source)
at org.apache.derby.impl.store.raw.data.RememberBytesInputStream.fillBuf(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.logColumn(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.logRow(Unknown Source)
at org.apache.derby.impl.store.raw.data.UpdateOperation.writeOptionalDataToBuffer(Unknown Source)
at org.apache.derby.impl.store.raw.data.UpdateOperation.<init>(Unknown Source)
at org.apache.derby.impl.store.raw.data.LoggableActions.actionUpdate(Unknown Source)
at org.apache.derby.impl.store.raw.data.StoredPage.doUpdateAtSlot(Unknown Source)
at org.apache.derby.impl.store.raw.data.BasePage.updateAtSlot(Unknown Source)
at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.replace(Unknown Source)
at org.apache.derby.impl.sql.execute.RowChangerImpl.updateRow(Unknown Source)
at org.apache.derby.impl.sql.execute.UpdateResultSet.collectAffectedRows(Unknown Source)
at org.apache.derby.impl.sql.execute.UpdateResultSet.open(Unknown Source)
at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
... 4 more
我不明白我做错了什么可以帮助谁？