apache > db
Apache DB Project
Font size:      



A BLOB (binary large object) is a varying-length binary string that can be up to two gigabytes long. Like other binary types, BLOB strings are not associated with a code page. In addition, BLOB strings do not hold character data.

The length is given in bytes for BLOB unless one of the suffixes K, M, or G is given, relating to the multiples of 1024, 1024*1024, 1024*1024*1024 respectively.

Length is specified in bytes for BLOB.


{ BLOB | BINARY LARGE OBJECT } ( length [{K |M |G }]))

Corresponding Compile-Time Java Type


JDBC Metadata Type (java.sql.Types)


Use the getBlob method on the java.sql.ResultSet to retrieve a BLOB handle to the underlying data.

Related Information

see java.sql.Blob and java.sql.Clob


create table pictures(name varchar(32) not null primary key, pic blob(16M));
--find all logotype pictures
select length(pic), name from pictures where name like '%logo%';
--find all image doubles (blob comparsions)
select a.name as double_one, b.name as double_two
from pictures as a, pictures as b
where a.name < b.name
and a.pic = b.pic
order by 1,2;

Previous Page
Next Page
Table of Contents