1.如何在
java中创建BLOB对象?
2.如何从db设置BLOB值?
3.如何在DB中设置BLOB值?
2.如何从db设置BLOB值?
3.如何在DB中设置BLOB值?
我已经创建了BLOB对象
byte [] fileId=b.toByteArray(); Blob blob=new SerialBlob(fileId);
但它给了我错误.所以请任何人帮助我.
提前致谢.
解决方法
1)创建BLOB使用Connection.createBlob
2)使用PreparedStatement.setBlob将BLOB写入DB
3)使用ResultSet.getBlob从DB读取BLOB
假设您的表t1具有BLOB列b1:
Connection conn = DriverManager.getConnection("jdbc:MysqL://localhost:3306/test","root","root"); Blob b1 = conn.createBlob(); b1.setBytes(1,new byte[10]); // first position is 1. Otherwise you get: Value of offset/position/start should be in the range [1,len] where len is length of Large Object[LOB] PreparedStatement ps = conn.prepareStatement("update t1 set c1 = ?"); ps.setBlob(1,b1); ps.executeUpdate(); Statement st = conn.createStatement(); ResultSet rs = st.executeQuery("select c1 from t1"); Blob b2 = rs.getBlob(1);