BLOB data type BLOB data type

A BLOB (binary large object) is a varying-length binary string that can be up to 2,147,483,647 characters 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.
Syntax { BLOB | BINARY LARGE OBJECT } [ ( length [{K |M |G }] ) ]
Default

A BLOB without a specified length is defaulted to two gigabytes (2,147,483,647).

Corresponding compile-time Java type

java.sql.Blob

JDBC metadata type (java.sql.Types)

BLOB

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

Related information

see

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;