Double-quoted strings resolve to column names if possible. Single-quoted

strings continue to be interpreted as string literals. (CVS 576)

FossilOrigin-Name: 55e7d65496624c8e48673d8747f3123786bfedbc

manifest

@@ -1,5 +1,5 @@
-C Clean\sup\ssome\scompiler\swarnings.\s(CVS\s575)
-D 2002-05-21T13:18:26
+C Double-quoted\sstrings\sresolve\sto\scolumn\snames\sif\spossible.\s\sSingle-quoted\nstrings\scontinue\sto\sbe\sinterpreted\sas\sstring\sliterals.\s(CVS\s576)
+D 2002-05-21T13:43:04
 F Makefile.in 6291a33b87d2a395aafd7646ee1ed562c6f2c28c
 F Makefile.template 4e11752e0b5c7a043ca50af4296ec562857ba495
 F README a4c0ba11354ef6ba0776b400d057c59da47a4cc0
@@ -23,7 +23,7 @@ F src/btree.h 8abeabfe6e0b1a990b64fa457592a6482f6674f3
 F src/build.c f5aa02e4553ca2db941d6e7f025a180ddc4cea49
 F src/delete.c c2eae01b76d5418d4ff1768659dfb199c38f0641
 F src/encode.c 346b12b46148506c32038524b95c4631ab46d760
-F src/expr.c 2c7535ba013b731ed73f12b6cc1cd5b466efb3e2
+F src/expr.c 01e1e395392284a3a480c90bd60b3a0fa99aab38
 F src/func.c a31dcba85bc2ecb9b752980289cf7e6cd0cafbce
 F src/hash.c cc259475e358baaf299b00a2c7370f2b03dda892
 F src/hash.h dca065dda89d4575f3176e75e9a3dc0f4b4fb8b9
@@ -83,7 +83,7 @@ F test/pager.test b0c0d00cd5dce0ce21f16926956b195c0ab5044c
 F test/pragma.test 0b9675ef1f5ba5b43abfa337744445fc5b01a34a
 F test/printf.test 3cb415073754cb8ff076f26173143c3cd293a9da
 F test/quick.test 6f023c7a73fc413e6d65b7a1879c79764038dc05
-F test/quote.test 286db944717afa9a9bf829dd85e59185c65d5435
+F test/quote.test 08f23385c685d3dc7914ec760d492cacea7f6e3d
 F test/rowid.test 4c55943300cddf73dd0f88d40a268cab14c83274
 F test/select1.test c19617be69fb1322c71e100b5882c469729c4bf1
 F test/select2.test aceea74fd895b9d007512f72499db589735bd8e4
@@ -134,7 +134,7 @@ F www/speed.tcl da8afcc1d3ccc5696cfb388a68982bc3d9f7f00f
 F www/sqlite.tcl 8b5884354cb615049aed83039f8dfe1552a44279
 F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331
 F www/vdbe.tcl 2013852c27a02a091d39a766bc87cff329f21218
-P f795afd63f19ab61c2b3b96621cb6dda31ce0379
-R f30d941f16e46cee9269d14d467bbb83
+P 3399b01219b9e75b93587b5634d199d9e6fb6e42
+R 11e5246ab7bc31d3891976630a69eee3
 U drh
-Z deb3155eb826aa47da17dfd5a82d0d75
+Z 5b4da1c5d40f9084cbbd43db1688a090

manifest.uuid

@@ -1 +1 @@
-3399b01219b9e75b93587b5634d199d9e6fb6e42
+55e7d65496624c8e48673d8747f3123786bfedbc

src/expr.c

@@ -12,7 +12,7 @@
 ** This file contains routines used for analyzing expressions and
 ** for generating VDBE code that evaluates expressions in SQLite.
 **
-** $Id: expr.c,v 1.60 2002/05/19 23:43:14 danielk1977 Exp $
+** $Id: expr.c,v 1.61 2002/05/21 13:43:04 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -285,6 +285,10 @@ void sqliteExprListDelete(ExprList *pList){
 /*
 ** Walk an expression tree.  Return 1 if the expression is constant
 ** and 0 if it involves variables.
+**
+** For the purposes of this function, a double-quoted string (ex: "abc")
+** is considered a variable but a single-quoted string (ex: 'abc') is
+** a constant.
 */
 int sqliteExprIsConstant(Expr *p){
   switch( p->op ){
@@ -292,9 +296,10 @@ int sqliteExprIsConstant(Expr *p){
     case TK_COLUMN:
     case TK_DOT:
       return 0;
+    case TK_STRING:
+      return p->token.z[0]=='\'';
     case TK_INTEGER:
     case TK_FLOAT:
-    case TK_STRING:
       return 1;
     default: {
       if( p->pLeft && !sqliteExprIsConstant(p->pLeft) ) return 0;
@@ -362,6 +367,14 @@ int sqliteExprResolveIds(
   if( pExpr==0 || pTabList==0 ) return 0;
   assert( base+pTabList->nId<=pParse->nTab );
   switch( pExpr->op ){
+    /* Double-quoted strings (ex: "abc") are used as identifiers if
+    ** possible.  Otherwise they remain as strings.  Single-quoted
+    ** strings (ex: 'abc') are always string literals.
+    */
+    case TK_STRING: {
+      if( pExpr->token.z[0]=='\'' ) break;
+      /* Fall thru into the TK_ID case if this is a double-quoted string */
+    }
     /* A lone identifier.  Try and match it as follows:
     **
     **     1.  To the name of a column of one of the tables in pTabList
@@ -419,7 +432,7 @@ int sqliteExprResolveIds(
         pExpr->op = TK_COLUMN;
       }
       sqliteFree(z);
-      if( cnt==0 ){
+      if( cnt==0 && pExpr->token.z[0]!='"' ){
         sqliteSetNString(&pParse->zErrMsg, "no such column: ", -1,  
           pExpr->token.z, pExpr->token.n, 0);
         pParse->nErr++;

test/quote.test

@@ -12,7 +12,7 @@
 # focus of this file is the ability to specify table and column names
 # as quoted strings.
 #
-# $Id: quote.test,v 1.2 2001/09/16 00:13:28 drh Exp $
+# $Id: quote.test,v 1.3 2002/05/21 13:43:04 drh Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -46,6 +46,22 @@ do_test quote-1.3 {
   } msg ]
   lappend r $msg
 } {0 {hello 10}}
+do_test quote-1.3.1 {
+  catchsql {
+    SELECT '!pqr', '#xyz'+5 FROM '@abc'
+  }
+} {0 {!pqr 5}}
+do_test quote-1.3.2 {
+  catchsql {
+    SELECT "!pqr", "#xyz"+5 FROM '@abc'
+  }
+} {0 {hello 10}}
+do_test quote-1.3 {
+  set r [catch {
+    execsql {SELECT '@abc'.'!pqr', '@abc'.'#xyz'+5 FROM '@abc'}
+  } msg ]
+  lappend r $msg
+} {0 {hello 10}}
 do_test quote-1.4 {
   set r [catch {
     execsql {UPDATE '@abc' SET '#xyz'=11}