mirror of https://github.com/sqlite/sqlite
Further simplifications of the code for the LIMIT clause on an UPDATE or DELETE. Added a few test cases to wherelimit.test. (CVS 5797)
FossilOrigin-Name: 282c6a46b25f4e4278fd4c8b0b1cde1de28d8f51
This commit is contained in:
shane
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20
manifest
20
manifest
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@ -1,5 +1,5 @@
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C Add\sthe\sgenfkey\sprogram\sto\sthe\stool/\sdirectory.\s(CVS\s5796)
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D 2008-10-10T17:58:27
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C Further\ssimplifications\sof\sthe\scode\sfor\sthe\sLIMIT\sclause\son\san\sUPDATE\sor\sDELETE.\s\sAdded\sa\sfew\stest\scases\sto\swherelimit.test.\s(CVS\s5797)
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D 2008-10-10T18:25:46
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F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
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F Makefile.in 7fc26e087207e7a4a7723583dbd7997477af3b13
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F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
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@ -106,7 +106,7 @@ F src/build.c 8714bd809583bbe07bf22d0e1808a3fc31abe330
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F src/callback.c e970e5beddbdb23f89a6d05cb1a6419d9f755624
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F src/complete.c cb14e06dbe79dee031031f0d9e686ff306afe07c
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F src/date.c 1b1fc801df40aae891bff8b03f65313df192d677
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F src/delete.c f72c98c5770c94f1a8b7bbdf7aeb49503a4927a4
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F src/delete.c c7aaf47f274494f9ae1f89cf095ca890b1d9d2bf
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F src/expr.c 0ceafeff3a4e0f460d6a7695a675ae12391e313d
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F src/fault.c dc88c821842157460750d2d61a8a8b4197d047ff
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F src/func.c 8431b40a7843d1024145684d303c55b4ee087bbe
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@ -140,7 +140,7 @@ F src/os_unix.c f33b69d8a85372b270fe37ee664a4c2140a5217d
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F src/os_win.c 04033a86a39f49cb8e348f515eb0116aa9d36678
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F src/pager.c d98f56128e849083f2f612196efebd982c491fea
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F src/pager.h 9c1917be28fff58118e1fe0ddbc7adfb8dd4f44d
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F src/parse.y 8862ab3391c9546f25d0e929906f100d0a9e7d2b
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F src/parse.y e8620c7efd46659fd7a9cbad13b51225af7f600c
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F src/pcache.c f8d7beceba164a34441ac37e88abb3a404f968a7
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F src/pcache.h 28d9ce2d66909db1f01652586450b62b64793093
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F src/pragma.c f0f48d0d50e9d8fa785178fc2410244c06f6a287
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@ -152,7 +152,7 @@ F src/select.c d910d7350df0d918e22286c5bfd39d4ea68ec813
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F src/shell.c d83b578a8ccdd3e0e7fef4388a0887ce9f810967
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F src/sqlite.h.in 28e6466da6b90e56bfbc6c50a1a281931a8c733c
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F src/sqlite3ext.h 1e3887c9bd3ae66cb599e922824b04cd0d0f2c3e
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F src/sqliteInt.h 0da9c664d89995d28587548048837e3063fa0be3
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F src/sqliteInt.h f60fac64c8970ca366080daa3aa65b9a54a2334a
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F src/sqliteLimit.h f435e728c6b620ef7312814d660a81f9356eb5c8
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F src/status.c 237b193efae0cf6ac3f0817a208de6c6c6ef6d76
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F src/table.c 22744786199c9195720c15a7a42cb97b2e2728d8
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@ -618,7 +618,7 @@ F test/where3.test 97d3936e6a443b968f1a61cdcc0f673252000e94
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F test/where4.test e9b9e2f2f98f00379e6031db6a6fca29bae782a2
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F test/where5.test fdf66f96d29a064b63eb543e28da4dfdccd81ad2
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F test/where6.test 42c4373595f4409d9c6a9987b4a60000ad664faf
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F test/wherelimit.test 3464395714151cdce9f7f28a19d2cf344bd934c8
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F test/wherelimit.test 5e9fd41e79bb2b2d588ed999d641d9c965619b31
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F test/zeroblob.test 792124852ec61458a2eb527b5091791215e0be95
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F tool/diffdb.c 7524b1b5df217c20cd0431f6789851a4e0cb191b
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F tool/fragck.tcl 5265a95126abcf6ab357f7efa544787e5963f439
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@ -648,7 +648,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
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F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
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F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
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F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
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P 3bb33cf59da49f13201c0226e964cda067a4e780
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R aef0f958c65788fc079e6ee823734d14
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U danielk1977
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Z 3eb8c7cc05cdf3fbc1c3afcf6ba604ca
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P 84e73fe8a6f538c4b1bb4f641a661d6fafb60c76
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R eb4c22bf5cef8091ed9bce14d73bbe63
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U shane
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Z 9ca81fedb812b2854e888eab6c64b7ec
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@ -1 +1 @@
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84e73fe8a6f538c4b1bb4f641a661d6fafb60c76
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282c6a46b25f4e4278fd4c8b0b1cde1de28d8f51
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61
src/delete.c
61
src/delete.c
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@ -12,7 +12,7 @@
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** This file contains C code routines that are called by the parser
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** in order to generate code for DELETE FROM statements.
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**
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** $Id: delete.c,v 1.180 2008/10/10 13:35:58 shane Exp $
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** $Id: delete.c,v 1.181 2008/10/10 18:25:46 shane Exp $
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*/
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#include "sqliteInt.h"
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@ -126,24 +126,37 @@ void sqlite3MaterializeView(
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** pLimitWhere (pInClause)
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*/
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Expr *sqlite3LimitWhere(
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Parse *pParse, /* The parser context */
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SrcList *pSrc, /* the FROM clause -- which tables to scan */
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Expr *pWhere, /* The WHERE clause. May be null */
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ExprList *pOrderBy, /* The ORDER BY clause. May be null */
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Expr *pLimit, /* The LIMIT clause. May be null */
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Expr *pOffset /* The OFFSET clause. May be null */
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Parse *pParse, /* The parser context */
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SrcList *pSrc, /* the FROM clause -- which tables to scan */
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Expr *pWhere, /* The WHERE clause. May be null */
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ExprList *pOrderBy, /* The ORDER BY clause. May be null */
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Expr *pLimit, /* The LIMIT clause. May be null */
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Expr *pOffset, /* The OFFSET clause. May be null */
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char *zStmtType /* Either DELETE or UPDATE. For error messages. */
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){
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Expr *pWhereRowid = NULL;
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Expr *pInClause = NULL;
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Expr *pSelectRowid = NULL;
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ExprList *pEList = NULL;
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SrcList *pSelectSrc = NULL;
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Select *pSelect = NULL;
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Expr *pWhereRowid = NULL; /* WHERE rowid .. */
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Expr *pInClause = NULL; /* WHERE rowid IN ( select ) */
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Expr *pSelectRowid = NULL; /* SELECT rowid ... */
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ExprList *pEList = NULL; /* Expression list contaning only pSelectRowid */
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SrcList *pSelectSrc = NULL; /* SELECT rowid FROM x ... (dup of pSrc) */
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Select *pSelect = NULL; /* Complete SELECT tree */
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/* Check that there isn't an ORDER BY without a LIMIT clause.
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*/
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if( pOrderBy && (pLimit == 0) ) {
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sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on %s", zStmtType);
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pParse->parseError = 1;
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goto limit_where_cleanup_2;
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}
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/* We only need to generate a select expression if there
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** is a limit/offset term to enforce.
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*/
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if (!pLimit && !pOffset) return pWhere;
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if( pLimit == 0 ) {
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/* if pLimit is null, pOffset will always be null as well. */
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assert( pOffset == 0 );
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return pWhere;
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}
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/* Generate a select expression tree to enforce the limit/offset
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** term for the DELETE or UPDATE statement. For example:
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@ -155,35 +168,43 @@ Expr *sqlite3LimitWhere(
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*/
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pSelectRowid = sqlite3Expr(pParse->db, TK_ROW, 0, 0, 0);
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if( pSelectRowid == 0 ) return 0;
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if( pSelectRowid == 0 ) goto limit_where_cleanup_2;
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pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid, 0);
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if( pEList == 0 ) return 0;
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if( pEList == 0 ) goto limit_where_cleanup_2;
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/* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
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** and the SELECT subtree. */
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pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc);
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if( pSelectSrc == 0 ) {
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sqlite3ExprListDelete(pParse->db, pEList);
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return 0;
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goto limit_where_cleanup_2;
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}
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/* generate the SELECT expression tree. */
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pSelect = sqlite3SelectNew(pParse,pEList,pSelectSrc,pWhere,0,0,pOrderBy,0,pLimit,pOffset);
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if( pSelect == 0 ) return 0;
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/* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
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pWhereRowid = sqlite3Expr(pParse->db, TK_ROW, 0, 0, 0);
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if( pWhereRowid == 0 ) goto limit_where_cleanup;
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if( pWhereRowid == 0 ) goto limit_where_cleanup_1;
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pInClause = sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0, 0);
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if( pInClause == 0 ) goto limit_where_cleanup;
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if( pInClause == 0 ) goto limit_where_cleanup_1;
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pInClause->pSelect = pSelect;
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sqlite3ExprSetHeight(pParse, pInClause);
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return pInClause;
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/* something went wrong. clean up anything allocated. */
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limit_where_cleanup:
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limit_where_cleanup_1:
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sqlite3SelectDelete(pParse->db, pSelect);
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return 0;
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limit_where_cleanup_2:
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sqlite3ExprDelete(pParse->db, pWhere);
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sqlite3ExprListDelete(pParse->db, pOrderBy);
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sqlite3ExprDelete(pParse->db, pLimit);
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sqlite3ExprDelete(pParse->db, pOffset);
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return 0;
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}
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#endif /* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY) */
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20
src/parse.y
20
src/parse.y
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** the parser. Lemon will also generate a header file containing
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** numeric codes for all of the tokens.
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**
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** @(#) $Id: parse.y,v 1.258 2008/10/10 17:47:21 danielk1977 Exp $
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** @(#) $Id: parse.y,v 1.259 2008/10/10 18:25:46 shane Exp $
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*/
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// All token codes are small integers with #defines that begin with "TK_"
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@ -582,13 +582,8 @@ limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y).
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cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W)
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orderby_opt(O) limit_opt(L). {
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sqlite3SrcListIndexedBy(pParse, X, &I);
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if( O && !L.pLimit ){
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sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on DELETE");
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pParse->parseError = 1;
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}else{
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W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset);
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sqlite3DeleteFrom(pParse,X,W);
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}
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W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset, "DELETE");
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sqlite3DeleteFrom(pParse,X,W);
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}
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%endif
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%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
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cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y) where_opt(W) orderby_opt(O) limit_opt(L). {
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sqlite3SrcListIndexedBy(pParse, X, &I);
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sqlite3ExprListCheckLength(pParse,Y,"set list");
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if( O && !L.pLimit ){
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sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on UPDATE");
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pParse->parseError = 1;
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}else{
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W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit,L.pOffset);
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sqlite3Update(pParse,X,Y,W,R);
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}
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W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset, "UPDATE");
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sqlite3Update(pParse,X,Y,W,R);
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}
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%endif
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%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
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*************************************************************************
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** Internal interface definitions for SQLite.
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**
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** @(#) $Id: sqliteInt.h,v 1.780 2008/10/10 04:34:16 shane Exp $
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** @(#) $Id: sqliteInt.h,v 1.781 2008/10/10 18:25:46 shane Exp $
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*/
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#ifndef _SQLITEINT_H_
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#define _SQLITEINT_H_
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@ -2162,7 +2162,7 @@ Table *sqlite3SrcListLookup(Parse*, SrcList*);
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int sqlite3IsReadOnly(Parse*, Table*, int);
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void sqlite3OpenTable(Parse*, int iCur, int iDb, Table*, int);
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#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) && !defined(SQLITE_OMIT_SUBQUERY)
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Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *);
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Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *, char *);
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#endif
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void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
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void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
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# focus of this file is testing the LIMIT ... OFFSET ... clause
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# of UPDATE and DELETE statements.
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#
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# $Id: wherelimit.test,v 1.1 2008/10/10 06:02:00 shane Exp $
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# $Id: wherelimit.test,v 1.2 2008/10/10 18:25:46 shane Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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@ -57,6 +57,15 @@ ifcapable {update_delete_limit} {
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catchsql {UPDATE t1 AS a SET y=1 WHERE x=1}
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} {1 {near "AS": syntax error}}
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# OFFSET w/o LIMIT
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do_test wherelimit-0.6 {
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catchsql {DELETE FROM t1 WHERE x=1 OFFSET 2}
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} {1 {near "OFFSET": syntax error}}
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do_test wherelimit-0.7 {
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catchsql {UPDATE t1 SET y=1 WHERE x=1 OFFSET 2}
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} {1 {near "OFFSET": syntax error}}
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# check deletes w/o where clauses but with limit/offsets
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create_test_data 5
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do_test wherelimit-1.0 {
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