使用 preparedstatement 和 sqlite 在 java 中将 byte [] 转换为 blob
byte [] to blob conversion in java using preparedstatement and sqllite
我正在尝试将 byte [] 转换为 blob。我的代码如下
byte [] hashValue = HashClass.hash256Bytes(messageValue);
//query = "insert into message values (?)";
connection = ConnectionFactory.getConnection();
//Blob blob = new javax.sql.rowset.serial.SerialBlob(hashValue);
Blob blob = new SerialBlob(hashValue);
//blob.setBytes(1, hashValue);
preStatement = (PreparedStatement)
connection.prepareStatement(query);
preStatement. setBlob(1, blob);
rs = preStatement.executeQuery();
但是它在 preStatement 处中断了。 setBlob(4,斑点)。我做了位 google 并尝试了下面的代码,但它在 connection.createBlob().
处给出了 null
Blob blob = connection.createBlob();
blob.setBytes(1, bytes);
尝试使用setBytes();
方法
byte [] hashValue = HashClass.hash256Bytes(messageValue);
//query = "insert into message values (?)";
connection = ConnectionFactory.getConnection();
//Blob blob = new javax.sql.rowset.serial.SerialBlob(hashValue);
//Blob blob = new SerialBlob(hashValue);
preStatement = (PreparedStatement) connection.prepareStatement(query);
preStatement. setBytes(1, hashValue);
rs = preStatement.executeQuery();
我正在尝试将 byte [] 转换为 blob。我的代码如下
byte [] hashValue = HashClass.hash256Bytes(messageValue);
//query = "insert into message values (?)";
connection = ConnectionFactory.getConnection();
//Blob blob = new javax.sql.rowset.serial.SerialBlob(hashValue);
Blob blob = new SerialBlob(hashValue);
//blob.setBytes(1, hashValue);
preStatement = (PreparedStatement)
connection.prepareStatement(query);
preStatement. setBlob(1, blob);
rs = preStatement.executeQuery();
但是它在 preStatement 处中断了。 setBlob(4,斑点)。我做了位 google 并尝试了下面的代码,但它在 connection.createBlob().
处给出了 null Blob blob = connection.createBlob();
blob.setBytes(1, bytes);
尝试使用setBytes();
方法
byte [] hashValue = HashClass.hash256Bytes(messageValue);
//query = "insert into message values (?)";
connection = ConnectionFactory.getConnection();
//Blob blob = new javax.sql.rowset.serial.SerialBlob(hashValue);
//Blob blob = new SerialBlob(hashValue);
preStatement = (PreparedStatement) connection.prepareStatement(query);
preStatement. setBytes(1, hashValue);
rs = preStatement.executeQuery();