114 lines
2.6 KiB
Plaintext
114 lines
2.6 KiB
Plaintext
# 2018-09-09
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix bestindex6
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ifcapable !vtab {
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finish_test
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return
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}
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register_tcl_module db
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proc vtab_command {src method args} {
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switch -- $method {
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xConnect {
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return [db one {SELECT sql FROM sqlite_master where name = $src}]
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}
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xBestIndex {
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set hdl [lindex $args 0]
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set clist [$hdl constraints]
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set orderby [$hdl orderby]
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set mask [$hdl mask]
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set wlist 1
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set iCons 0
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set ret [list]
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foreach cons $clist {
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catch { array unset C }
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array set C $cons
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if {$C(usable)} {
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set col [db one {
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SELECT name FROM pragma_table_info($src) WHERE cid=$C(column)
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}]
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switch $C(op) {
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isnull {
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lappend wlist "$col IS NULL"
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lappend ret omit $iCons
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}
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eq {
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lappend wlist "$col = %$iCons%"
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lappend ret omit $iCons
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}
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}
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}
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incr iCons
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}
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#puts "xBestIndex: $ret"
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lappend ret idxStr [join $wlist " AND "]
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return $ret
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}
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xFilter {
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foreach {idxnum idxstr aa} $args {}
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set map [list]
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for {set iCons 0} {$iCons < [llength $aa]} {incr iCons} {
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lappend map %$iCons% [lindex $aa $iCons]
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}
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set ret [list sql \
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"SELECT rowid, * FROM $src WHERE [string map $map $idxstr]"
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]
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# puts "xFilter: $ret"
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return $ret
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}
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}
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return {}
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}
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do_execsql_test 1.0 {
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CREATE TABLE t1(id int, value text);
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CREATE TABLE t2(ctx int, id int, value text);
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INSERT INTO t1 VALUES(1,'try');
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INSERT INTO t2 VALUES(1,1,'good');
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INSERT INTO t2 VALUES(2,2,'evil');
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CREATE VIRTUAL TABLE vt1 USING tcl(vtab_command t1);
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CREATE VIRTUAL TABLE vt2 USING tcl(vtab_command t2);
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}
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do_execsql_test 1.1 {
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select * from t2 left join t1 on t1.id=t2.ctx where t1.value is null;
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} {2 2 evil {} {}}
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do_execsql_test 1.2 {
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select * from vt2 left join vt1 on vt1.id=vt2.ctx where vt1.value is null;
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} {2 2 evil {} {}}
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unset -nocomplain xxx
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do_execsql_test 1.3 {
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select * from vt2 left join vt1 on vt1.id=vt2.ctx where vt1.value is $xxx;
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} {2 2 evil {} {}}
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do_execsql_test 1.4 {
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select * from t2 left join vt1 on vt1.id=t2.ctx where vt1.value = 3
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} {}
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finish_test
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