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In the nextchar.c extension, allow the second argument to the next_char()

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function to be a subquery.

FossilOrigin-Name: 59b9fa223681a7329533b350be7bf5a0a3609255
This commit is contained in:
drh
2013-09-28 13:28:40 +00:00
parent 2f312ee65f
commit f42747246a
4 changed files with 27 additions and 11 deletions
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19
ext/misc/nextchar.c
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@ -38,6 +38,19 @@
** out) run the following query:
**
** SELECT next_char('cha','dictionary','word');
**
** IMPLEMENTATION NOTES:
**
** The next_char function is implemented using recursive SQL that makes
** use of the table name and column name as part of a query. If either
** the table name or column name are keywords or contain special characters,
** then they should be escaped. For example:
**
** SELECT next_char('cha','[dictionary]','[word]');
**
** This also means that the table name can be a subquery:
**
** SELECT next_char('cha','(SELECCT word AS w FROM dictionary)','w');
*/
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1
@ -231,9 +244,9 @@ static void nextCharFunc(
zColl = "";
}
zSql = sqlite3_mprintf(
"SELECT \"%w\" FROM \"%w\""
" WHERE \"%w\">=(?1 || ?2) %s"
" AND \"%w\"<=(?1 || char(1114111)) %s" /* 1114111 == 0x10ffff */
"SELECT %s FROM %s"
" WHERE %s>=(?1 || ?2) %s"
" AND %s<=(?1 || char(1114111)) %s" /* 1114111 == 0x10ffff */
" %s"
" ORDER BY 1 %s ASC LIMIT 1",
zField, zTable, zField, zColl, zField, zColl, zWhereClause, zColl