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Each value represents +an operator that is part of a constraint term in the WHERE clause of +a query that uses a <a href="../vtab.html">virtual table</a>.</p> + +<p>The left-hand operand of the operator is given by the corresponding +aConstraint[].iColumn field. An iColumn of -1 indicates the left-hand +operand is the rowid. +The SQLITE_INDEX_CONSTRAINT_LIMIT and SQLITE_INDEX_CONSTRAINT_OFFSET +operators have no left-hand operand, and so for those operators the +corresponding aConstraint[].iColumn is meaningless and should not be +used.</p> + +<p>All operator values from SQLITE_INDEX_CONSTRAINT_FUNCTION through +value 255 are reserved to represent functions that are overloaded +by the <a href="../vtab.html#xfindfunction">xFindFunction method</a> of the virtual table +implementation.</p> + +<p>The right-hand operands for each constraint might be accessible using +the <a href="../c3ref/vtab_rhs_value.html">sqlite3_vtab_rhs_value()</a> interface. Usually the right-hand +operand is only available if it appears as a single constant literal +in the input SQL. If the right-hand operand is another column or an +expression (even a constant expression) or a parameter, then the +sqlite3_vtab_rhs_value() probably will not be able to extract it. +The SQLITE_INDEX_CONSTRAINT_ISNULL and +SQLITE_INDEX_CONSTRAINT_ISNOTNULL operators have no right-hand operand +and hence calls to sqlite3_vtab_rhs_value() for those operators will +always return SQLITE_NOTFOUND.</p> + +<p>The collating sequence to be used for comparison can be found using +the <a href="../c3ref/vtab_collation.html">sqlite3_vtab_collation()</a> interface. For most real-world virtual +tables, the collating sequence of constraints does not matter (for example +because the constraints are numeric) and so the sqlite3_vtab_collation() +interface is no commonly needed. +</p><p>See also lists of + <a href="objlist.html">Objects</a>, + <a href="constlist.html">Constants</a>, and + <a href="funclist.html">Functions</a>.</p> + |