1RDF::Query::Compiler::SUQsLe(r3)Contributed Perl DocumenRtDaFt:i:oQnuery::Compiler::SQL(3)
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NAME

6       RDF::Query::Compiler::SQL - Compile a SPARQL query directly to SQL.
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VERSION

9       This document describes RDF::Query::Compiler::SQL version 2.918.
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STATUS

12       This module's API and functionality should be considered deprecated.
13       If you need functionality that this module provides, please get in
14       touch <http://www.perlrdf.org/>.
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METHODS

17       "new ( $parse_tree )"
18           Returns a new compiler object.
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20       "compile ()"
21           Returns a SQL query string for the specified parse tree.
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23       "emit_select"
24           Returns a SQL query string representing the query.
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26       "limit_clause"
27           Returns a SQL LIMIT clause, or an empty string if the query does
28           not need limiting.
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30       "order_by_clause"
31           Returns a SQL ORDER BY clause, or an empty string if the query does
32           not use ordering.
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34       "variable_columns ( $var )"
35           Given a variable name, returns the set of column aliases that store
36           the values for the column (values for Literals, URIs, and Blank
37           Nodes).
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39       "add_variable_values_joins"
40           Modifies the query by adding LEFT JOINs to the tables in the
41           database that contain the node values (for literals, resources, and
42           blank nodes).
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44       "patterns2sql ( \@triples, \$level, %args )"
45           Builds the SQL query in instance data from the supplied @triples.
46           $level is used as a unique identifier for recursive calls.
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48           %args may contain callback closures for the following keys:
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50             'where_hook'
51             'from_hook'
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53           When present, these closures are used to add SQL FROM and WHERE
54           clauses to the query instead of adding them directly to the
55           object's instance data.
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57       "expr2sql ( $expression, \$level, %args )"
58           Returns a SQL expression for the supplied query $expression.
59           $level is used as a unique identifier for recursive calls.
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61           %args may contain callback closures for the following keys:
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63             'where_hook'
64             'from_hook'
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66           When present, these closures are used to add necessary SQL FROM and
67           WHERE clauses to the query.
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69       "_mysql_hash ( $data )"
70           Returns a hash value for the supplied $data string. This value is
71           computed using the same algorithm that Redland's mysql storage
72           backend uses.
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74       "_mysql_node_hash ( $node )"
75           Returns a hash value (computed by "_mysql_hash" for the supplied
76           $node.  The hash value is based on the string value of the node and
77           the node type.
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79       "qualify_uri ( $uri )"
80           Returns a fully qualified URI from the supplied $uri. $uri may
81           already be a qualified URI, or a parse tree for a qualified URI or
82           QName. If $uri is a QName, the namespaces defined in the query
83           parse tree are used to fully qualify.
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85       "add_function ( $uri, $function )"
86           Associates the custom function $function (a CODE reference) with
87           the specified URI, allowing the function to be called by query
88           FILTERs.
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90       "get_function ( $uri )"
91           If $uri is associated with a query function, returns a CODE
92           reference to the function. Otherwise returns "undef".
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AUTHOR

95        Gregory Williams <gwilliams@cpan.org>
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99perl v5.38.0                      2023-07-21      RDF::Query::Compiler::SQL(3)
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