What is an input parameter in the EJB query language?

An input parameter is used to make a query flexible, so that the parameters may not be hard coded in a bean class. This enables a user to input parameters in a query. An input parameter is designated by a question mark (?) followed by an integer. The following rules apply to the input parameter in the EJB query language:

• An input parameter must be numbered using integer values starting from 1.
• The number of input parameters in the WHERE clause must be less than or equal to the number of parameters in the corresponding finder or select method.
• An input parameter can be used only in the WHERE clause and not in a SELECT or FROM clause.
• An input parameter in the WHERE clause must match the type of the parameter in the finder or select method.

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