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Detect and handles the case where a row is modified or deleted while it

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is being read during SELECT processing. (CVS 5399)

FossilOrigin-Name: c80a5d09935c60a2a50bc262c172a94073355f0d
This commit is contained in:
drh
2008-07-11 21:02:53 +00:00
parent f460809030
commit a34605859d
11 changed files with 189 additions and 59 deletions
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35
src/test_func.c
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@@ -12,7 +12,7 @@
** Code for testing all sorts of SQLite interfaces. This code
** implements new SQL functions used by the test scripts.
**
** $Id: test_func.c,v 1.7 2008/07/08 14:17:35 danielk1977 Exp $
** $Id: test_func.c,v 1.8 2008/07/11 21:02:54 drh Exp $
*/
#include "sqlite3.h"
#include "tcl.h"
@@ -230,6 +230,38 @@ static void test_isolation(
sqlite3_result_value(pCtx, argv[1]);
}
/*
** Invoke an SQL statement recursively. The function result is the
** first column of the first row of the result set.
*/
static void test_eval(
sqlite3_context *pCtx,
int nArg,
sqlite3_value **argv
){
sqlite3_stmt *pStmt;
int rc;
sqlite3 *db = sqlite3_context_db_handle(pCtx);
const char *zSql;
zSql = (char*)sqlite3_value_text(argv[0]);
rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
if( rc==SQLITE_OK ){
rc = sqlite3_step(pStmt);
if( rc==SQLITE_ROW ){
sqlite3_result_value(pCtx, sqlite3_column_value(pStmt, 0));
}
rc = sqlite3_finalize(pStmt);
}
if( rc ){
char *zErr;
assert( pStmt==0 );
zErr = sqlite3_mprintf("sqlite3_prepare_v2() error: %s",sqlite3_errmsg(db));
sqlite3_result_text(pCtx, zErr, -1, sqlite3_free);
sqlite3_result_error_code(pCtx, rc);
}
}
static int registerTestFunctions(sqlite3 *db){
static const struct {
@@ -245,6 +277,7 @@ static int registerTestFunctions(sqlite3 *db){
{ "test_auxdata", -1, SQLITE_UTF8, test_auxdata},
{ "test_error", 1, SQLITE_UTF8, test_error},
{ "test_error", 2, SQLITE_UTF8, test_error},
{ "test_eval", 1, SQLITE_UTF8, test_eval},
{ "test_isolation", 2, SQLITE_UTF8, test_isolation},
};
int i;