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Initial code to make shadow tables read-only to ordinary SQL. The now

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xShadowName method is added to the sqlite3_module object and is used
to identify potential shadow tables.  The SQLITE_PREPARE_SHADOW argument
to sqlite3_prepare_v3() is defined.  It is designed to permit writing to
shadow tables, but is currently an unused placeholder.

FossilOrigin-Name: 31942b3dd3f66eb0d9977bf1cadc2f2d7be7967cce2b55784be0b939dfef1985
This commit is contained in:
drh
2018-11-05 23:01:45 +00:00
parent 2d13f6016b
commit 84c501bac1
33 changed files with 187 additions and 63 deletions
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22
ext/rtree/rtree.c
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@ -3325,8 +3325,24 @@ static int rtreeQueryStat1(sqlite3 *db, Rtree *pRtree){
return rc;
}
/*
** Return true if zName is the extension on one of the shadow tables used
** by this module.
*/
static int rtreeShadowName(const char *zName){
static const char *azName[] = {
"node", "parent", "rowid"
};
unsigned int i;
for(i=0; i<sizeof(azName)/sizeof(azName[0]); i++){
if( sqlite3_stricmp(zName, azName[i])==0 ) return 1;
}
return 0;
}
static sqlite3_module rtreeModule = {
2, /* iVersion */
3, /* iVersion */
rtreeCreate, /* xCreate - create a table */
rtreeConnect, /* xConnect - connect to an existing table */
rtreeBestIndex, /* xBestIndex - Determine search strategy */
@ -3349,6 +3365,7 @@ static sqlite3_module rtreeModule = {
rtreeSavepoint, /* xSavepoint */
0, /* xRelease */
0, /* xRollbackTo */
rtreeShadowName /* xShadowName */
};
static int rtreeSqlInit(
@ -3434,7 +3451,8 @@ static int rtreeSqlInit(
}
zSql = sqlite3_mprintf(zFormat, zDb, zPrefix);
if( zSql ){
rc = sqlite3_prepare_v3(db, zSql, -1, SQLITE_PREPARE_PERSISTENT,
rc = sqlite3_prepare_v3(db, zSql, -1,
SQLITE_PREPARE_PERSISTENT | SQLITE_PREPARE_SHADOW,
appStmt[i], 0);
}else{
rc = SQLITE_NOMEM;