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Modifications to the VDBE to support more than one database file. (CVS 878)

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FossilOrigin-Name: 875da9eed981bfa27b98e95025f9fdbed74b4098
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drh
2003-03-19 03:14:00 +00:00
parent 9468c7f489
commit 001bbcbb8f
19 changed files with 451 additions and 266 deletions
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30
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.162 2003/02/16 22:21:32 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.163 2003/03/19 03:14:02 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
@@ -187,6 +187,21 @@ typedef struct Trigger Trigger;
typedef struct TriggerStep TriggerStep;
typedef struct TriggerStack TriggerStack;
typedef struct FKey FKey;
typedef struct Db Db;
/*
** Each database file to be accessed by the system is an instance
** of the following structure. There are normally two of these structures
** in the sqlite.aDb[] array. aDb[0] is the main database file and
** aDb[1] is the database file used to hold temporary tables. But
** additional databases may be attached to the engine.
*/
struct Db {
char *zName; /* Name of this database */
Btree *pBt; /* The B*Tree structure for this database file */
int schema_cookie; /* Database schema version number for this file */
u8 inTrans; /* True if a transaction is underway for this backend */
};
/*
** Each database is an instance of the following structure.
@@ -204,14 +219,14 @@ typedef struct FKey FKey;
** text datatypes.
*/
struct sqlite {
Btree *pBe; /* The B*Tree backend */
Btree *pBeTemp; /* Backend for session temporary tables */
int nDb; /* Number of backends currently in use */
Db *aDb; /* All backends */
Db aDbStatic[2]; /* Static space for the 2 default backends */
int flags; /* Miscellanous flags. See below */
u8 file_format; /* What file format version is this database? */
u8 safety_level; /* How aggressive at synching data to disk */
u8 want_to_close; /* Close after all VDBEs are deallocated */
int schema_cookie; /* Magic number that changes with the schema */
int next_cookie; /* Value of schema_cookie after commit */
int next_cookie; /* Next value of aDb[0].schema_cookie */
int cache_size; /* Number of pages to use in the cache */
int nTable; /* Number of tables in the database */
void *pBusyArg; /* 1st Argument to the busy callback */
@@ -348,7 +363,7 @@ struct Table {
int tnum; /* Root BTree node for this table (see note above) */
Select *pSelect; /* NULL for tables. Points to definition if a view. */
u8 readOnly; /* True if this table should not be written by the user */
u8 isTemp; /* True if stored in db->pBeTemp instead of db->pBe */
u8 isTemp; /* Index into sqlite.aDb[] of the backend for this table */
u8 isTransient; /* True if automatically deleted when VDBE finishes */
u8 hasPrimKey; /* True if there exists a primary key */
u8 keyConf; /* What to do in case of uniqueness conflict on iPKey */
@@ -731,7 +746,6 @@ struct AggExpr {
*/
struct Parse {
sqlite *db; /* The main database structure */
Btree *pBe; /* The database backend */
int rc; /* Return code from execution */
sqlite_callback xCallback; /* The callback function */
void *pArg; /* First argument to the callback function */
@@ -1003,6 +1017,8 @@ int sqliteExprAnalyzeAggregates(Parse*, Expr*);
Vdbe *sqliteGetVdbe(Parse*);
int sqliteRandomByte(void);
int sqliteRandomInteger(void);
void sqliteRollbackAll(sqlite*);
void sqliteCodeVerifySchema(Parse*);
void sqliteBeginTransaction(Parse*, int);
void sqliteCommitTransaction(Parse*);
void sqliteRollbackTransaction(Parse*);