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PreparedStatement allows the dynamic query to vary depending on the query parameter. [11] CallableStatement – CallableStatement is a subinterface of the Statement interface. [11] It is used for executing stored procedures on the database. [11] [12] Both input and output parameters must be passed into the database for stored procedures. [13]
All parameters are separated with the pipe character "|". The first "parameter" is always the name of the template that you wish to use and as such is not formally a parameter at all. In this case, it is Querylink. The first formal parameter passed to the template should be the name of the internal page that you wish to link.
This template uses Module:Check for unknown parameters. All allowed parameters must be listed at {{#invoke:Check for unknown parameters|...}} in the template's own code. A call with an unlisted parameter may cause a warning in previews and may add a tracking category. There are two optional parameters preview and category.
Certain templates have the parameter "on" by default; see the main table for all alternate options. If a row renders identically to a previous row, it means the current template does not support that option and {{ tlg }} needs to be used instead.
The consequence of this is that a different query plan is compiled and stored for each different length. In general, the maximum number of "duplicate" plans is the product of the lengths of the variable length columns as specified in the database. For this reason, it is important to use the standard Add method for variable length columns: command.
A custom value for a parameter may be supplied by using |[parameter name]=[value] in place of |[parameter name]. Any formatting for such a value – including, for instance, italics – must be supplied as part of the value (e.g. |parameter=''value''<br/>). Custom values cannot be used for parameters whose names begin with an underscore ("_").
Template names are added to pages inside double curly brackets. In addition, user-typed parameters are allowed, so that the template has some input to work with. The parameters allow the templates to be tailored to the specific needs of different articles and pages.
Unlike the later ODBC, Blueprint was a purely code-based system, lacking anything approximating a command language like SQL. Instead, programmers used data structures to store the query information, constructing a query by linking many of these structures together. Lotus referred to these compound structures as query trees. [2]