182 lines
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HTML
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7 KiB
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<!-- keywords: SQLITE_INDEX_CONSTRAINT_EQ SQLITE_INDEX_CONSTRAINT_FUNCTION SQLITE_INDEX_CONSTRAINT_GE SQLITE_INDEX_CONSTRAINT_GLOB SQLITE_INDEX_CONSTRAINT_GT SQLITE_INDEX_CONSTRAINT_IS SQLITE_INDEX_CONSTRAINT_ISNOT SQLITE_INDEX_CONSTRAINT_ISNOTNULL SQLITE_INDEX_CONSTRAINT_ISNULL SQLITE_INDEX_CONSTRAINT_LE SQLITE_INDEX_CONSTRAINT_LIKE SQLITE_INDEX_CONSTRAINT_LIMIT SQLITE_INDEX_CONSTRAINT_LT SQLITE_INDEX_CONSTRAINT_MATCH SQLITE_INDEX_CONSTRAINT_NE SQLITE_INDEX_CONSTRAINT_OFFSET SQLITE_INDEX_CONSTRAINT_REGEXP -->
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<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Virtual Table Constraint Operator Codes</h2>
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</div>
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<blockquote><pre>
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#define SQLITE_INDEX_CONSTRAINT_EQ 2
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#define SQLITE_INDEX_CONSTRAINT_GT 4
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#define SQLITE_INDEX_CONSTRAINT_LE 8
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#define SQLITE_INDEX_CONSTRAINT_LT 16
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#define SQLITE_INDEX_CONSTRAINT_GE 32
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#define SQLITE_INDEX_CONSTRAINT_MATCH 64
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#define SQLITE_INDEX_CONSTRAINT_LIKE 65
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#define SQLITE_INDEX_CONSTRAINT_GLOB 66
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#define SQLITE_INDEX_CONSTRAINT_REGEXP 67
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#define SQLITE_INDEX_CONSTRAINT_NE 68
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#define SQLITE_INDEX_CONSTRAINT_ISNOT 69
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#define SQLITE_INDEX_CONSTRAINT_ISNOTNULL 70
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#define SQLITE_INDEX_CONSTRAINT_ISNULL 71
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#define SQLITE_INDEX_CONSTRAINT_IS 72
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#define SQLITE_INDEX_CONSTRAINT_LIMIT 73
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#define SQLITE_INDEX_CONSTRAINT_OFFSET 74
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#define SQLITE_INDEX_CONSTRAINT_FUNCTION 150
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</pre></blockquote>
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<p>
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These macros define the allowed values for the
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<a href="../c3ref/index_info.html">sqlite3_index_info</a>.aConstraint[].op field. Each value represents
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an operator that is part of a constraint term in the WHERE clause of
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a query that uses a <a href="../vtab.html">virtual table</a>.</p>
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<p>The left-hand operand of the operator is given by the corresponding
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aConstraint[].iColumn field. An iColumn of -1 indicates the left-hand
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operand is the rowid.
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The SQLITE_INDEX_CONSTRAINT_LIMIT and SQLITE_INDEX_CONSTRAINT_OFFSET
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operators have no left-hand operand, and so for those operators the
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corresponding aConstraint[].iColumn is meaningless and should not be
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used.</p>
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<p>All operator values from SQLITE_INDEX_CONSTRAINT_FUNCTION through
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value 255 are reserved to represent functions that are overloaded
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by the <a href="../vtab.html#xfindfunction">xFindFunction method</a> of the virtual table
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implementation.</p>
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<p>The right-hand operands for each constraint might be accessible using
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the <a href="../c3ref/vtab_rhs_value.html">sqlite3_vtab_rhs_value()</a> interface. Usually the right-hand
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operand is only available if it appears as a single constant literal
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in the input SQL. If the right-hand operand is another column or an
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expression (even a constant expression) or a parameter, then the
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sqlite3_vtab_rhs_value() probably will not be able to extract it.
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The SQLITE_INDEX_CONSTRAINT_ISNULL and
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SQLITE_INDEX_CONSTRAINT_ISNOTNULL operators have no right-hand operand
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and hence calls to sqlite3_vtab_rhs_value() for those operators will
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always return SQLITE_NOTFOUND.</p>
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<p>The collating sequence to be used for comparison can be found using
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the <a href="../c3ref/vtab_collation.html">sqlite3_vtab_collation()</a> interface. For most real-world virtual
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tables, the collating sequence of constraints does not matter (for example
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because the constraints are numeric) and so the sqlite3_vtab_collation()
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interface is not commonly needed.
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</p><p>See also lists of
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<a href="../c3ref/objlist.html">Objects</a>,
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<a href="../c3ref/constlist.html">Constants</a>, and
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<a href="../c3ref/funclist.html">Functions</a>.</p>
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