LIKE predicate

The LIKE predicate searches a string value for a certain pattern

string-expression   [NOT]  LIKE  pattern    [ ESCAPE escape-character ]

The pattern value is a string literal or parameter marker of type string in which the underscore ( _ ) stands for any single character and percent ( % ) stands for any sequence of characters ( including empty sequence ). Any other character stands for itself. The escape character can be used to search for character _ and %. The escape character can be specified as a string literal or an input parameter.

If the string-expression is null, then the result is unknown.

If both string-expression and pattern are empty, then the result is true.

 

Example: LIKE predicate

• '' LIKE '' is true

• '' LIKE '%' is true

• e.name LIKE '12%3' is true for '123' '12993' and false for '1234'

• e.name LIKE 's_me' is true for 'some' and 'same', false for 'soome'

• e.name LIKE '/_foo' escape '/' is true for '_foo', false for 'afoo'

• e.name LIKE '//_foo' escape '/' is true for '/afoo' and for '/bfoo'

• e.name LIKE '///_foo' escape '/' is true for '/_foo' but false for '/afoo'

 

See Also

EJB query language
WHERE clause
Using EJB query

 

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