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Changes to the "sqlite" structure that allow simultaneous operations on

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multiple database files.  Many regession tests pass - but not all of them.
Do not use this version except for debugging SQLite itself. (CVS 883)

FossilOrigin-Name: d2fb2bb50cf1e13feb90995079f291384abd6ba9
This commit is contained in:
drh
2003-03-27 12:51:24 +00:00
parent 84e6335c0c
commit d24cc427b7
14 changed files with 478 additions and 338 deletions
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59
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.164 2003/03/20 01:16:59 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.165 2003/03/27 12:51:25 drh Exp $
*/
#include "config.h"
#include "sqlite.h"
@@ -200,7 +200,12 @@ 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 */
Hash tblHash; /* All tables indexed by name */
Hash idxHash; /* All (named) indices indexed by name */
Hash trigHash; /* All triggers indexed by name */
Hash aFKey; /* Foreign keys indexed by to-table */
u8 inTrans; /* True if a transaction is underway for this backend */
u16 flags; /* Flags associated with this database */
};
/*
@@ -231,11 +236,7 @@ struct sqlite {
int nTable; /* Number of tables in the database */
void *pBusyArg; /* 1st Argument to the busy callback */
int (*xBusyCallback)(void *,const char*,int); /* The busy callback */
Hash tblHash; /* All tables indexed by name */
Hash idxHash; /* All (named) indices indexed by name */
Hash trigHash; /* All triggers indexed by name */
Hash aFunc; /* All functions that can be in SQL exprs */
Hash aFKey; /* Foreign keys indexed by to-table */
int lastRowid; /* ROWID of most recent insert */
int priorNewRowid; /* Last randomly generated ROWID */
int onError; /* Default conflict algorithm */
@@ -329,26 +330,27 @@ struct Column {
** Each SQL table is represented in memory by an instance of the
** following structure.
**
** Expr.zName is the name of the table. The case of the original
** Table.zName is the name of the table. The case of the original
** CREATE TABLE statement is stored, but case is not significant for
** comparisons.
**
** Expr.nCol is the number of columns in this table. Expr.aCol is a
** Table.nCol is the number of columns in this table. Table.aCol is a
** pointer to an array of Column structures, one for each column.
**
** If the table has an INTEGER PRIMARY KEY, then Expr.iPKey is the index of
** the column that is that key. Otherwise Expr.iPKey is negative. Note
** If the table has an INTEGER PRIMARY KEY, then Table.iPKey is the index of
** the column that is that key. Otherwise Table.iPKey is negative. Note
** that the datatype of the PRIMARY KEY must be INTEGER for this field to
** be set. An INTEGER PRIMARY KEY is used as the rowid for each row of
** the table. If a table has no INTEGER PRIMARY KEY, then a random rowid
** is generated for each row of the table. Expr.hasPrimKey is true if
** is generated for each row of the table. Table.hasPrimKey is true if
** the table has any PRIMARY KEY, INTEGER or otherwise.
**
** Expr.tnum is the page number for the root BTree page of the table in the
** database file. If Expr.isTemp is true, then this page occurs in the
** auxiliary database file, not the main database file. If Expr.isTransient
** Table.tnum is the page number for the root BTree page of the table in the
** database file. If Table.iDb is the index of the database table backend
** in sqlite.aDb[]. 0 is for the main database and 1 is for the file that
** holds temporary tables and indices. If Table.isTransient
** is true, then the table is stored in a file that is automatically deleted
** when the VDBE cursor to the table is closed. In this case Expr.tnum
** when the VDBE cursor to the table is closed. In this case Table.tnum
** refers VDBE cursor number that holds the table open, not to the root
** page number. Transient tables are used to hold the results of a
** sub-query that appears instead of a real table name in the FROM clause
@@ -363,7 +365,7 @@ 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; /* Index into sqlite.aDb[] of the backend for this table */
u8 iDb; /* 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 */
@@ -479,6 +481,7 @@ struct Index {
u8 isUnique; /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
u8 onError; /* OE_Abort, OE_Ignore, OE_Replace, or OE_None */
u8 autoIndex; /* True if is automatically created (ex: by UNIQUE) */
u8 iDb; /* Index in sqlite.aDb[] of where this index is stored */
Index *pNext; /* The next index associated with the same table */
};
@@ -604,6 +607,12 @@ struct IdList {
** The following structure describes the FROM clause of a SELECT statement.
** Each table or subquery in the FROM clause is a separate element of
** the SrcList.a[] array.
**
** With the addition of multiple database support, the following structure
** can also be used to describe a particular table such as the table that
** is modified by an INSERT, DELETE, or UPDATE statement. In standard SQL,
** such a table must be a simple name: ID. But in SQLite, the table can
** now be identified by a database name, a dot, then the table name: ID.ID.
*/
struct SrcList {
int nSrc; /* Number of tables or subqueries in the FROM clause */
@@ -765,7 +774,7 @@ struct Parse {
** while generating expressions. Normally false */
u8 schemaVerified; /* True if an OP_VerifySchema has been coded someplace
** other than after an OP_Transaction */
u8 isTemp; /* True if parsing temporary tables */
u8 iDb; /* Index of database whose schema is being parsed */
u8 useCallback; /* True if callbacks should be used to report results */
int newTnum; /* Table number to use when reparsing CREATE TABLEs */
int nErr; /* Number of errors seen */
@@ -807,6 +816,7 @@ struct Parse {
struct Trigger {
char *name; /* The name of the trigger */
char *table; /* The table or view to which the trigger applies */
int iDb; /* Database containing this trigger */
int op; /* One of TK_DELETE, TK_UPDATE, TK_INSERT */
int tr_tm; /* One of TK_BEFORE, TK_AFTER */
Expr *pWhen; /* The WHEN clause of the expresion (may be NULL) */
@@ -973,7 +983,6 @@ void sqliteAddCollateType(Parse*, int);
void sqliteEndTable(Parse*,Token*,Select*);
void sqliteCreateView(Parse*,Token*,Token*,Select*,int);
int sqliteViewGetColumnNames(Parse*,Table*);
void sqliteViewResetAll(sqlite*);
void sqliteDropTable(Parse*, Token*, int);
void sqliteDeleteTable(sqlite*, Table*);
void sqliteInsert(Parse*, SrcList*, ExprList*, Select*, IdList*, int);
@@ -983,8 +992,8 @@ SrcList *sqliteSrcListAppend(SrcList*, Token*, Token*);
void sqliteSrcListAddAlias(SrcList*, Token*);
void sqliteIdListDelete(IdList*);
void sqliteSrcListDelete(SrcList*);
void sqliteCreateIndex(Parse*, Token*, Token*, IdList*, int, Token*, Token*);
void sqliteDropIndex(Parse*, Token*);
void sqliteCreateIndex(Parse*,Token*,SrcList*,IdList*,int,int,Token*,Token*);
void sqliteDropIndex(Parse*, SrcList*);
void sqliteAddKeyType(Vdbe*, ExprList*);
void sqliteAddIdxKeyType(Vdbe*, Index*);
int sqliteSelect(Parse*, Select*, int, int, Select*, int, int*);
@@ -992,7 +1001,7 @@ Select *sqliteSelectNew(ExprList*,SrcList*,Expr*,ExprList*,Expr*,ExprList*,
int,int,int);
void sqliteSelectDelete(Select*);
void sqliteSelectUnbind(Select*);
Table *sqliteTableNameToTable(Parse*, const char*);
Table *sqliteTableNameToTable(Parse*, const char*, const char*);
void sqliteDeleteFrom(Parse*, SrcList*, Expr*);
void sqliteUpdate(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqliteWhereBegin(Parse*, int, SrcList*, Expr*, int, ExprList**);
@@ -1000,10 +1009,10 @@ void sqliteWhereEnd(WhereInfo*);
void sqliteExprCode(Parse*, Expr*);
void sqliteExprIfTrue(Parse*, Expr*, int, int);
void sqliteExprIfFalse(Parse*, Expr*, int, int);
Table *sqliteFindTable(sqlite*,const char*);
Index *sqliteFindIndex(sqlite*,const char*);
Table *sqliteFindTable(sqlite*,const char*, const char*);
Index *sqliteFindIndex(sqlite*,const char*, const char*);
void sqliteUnlinkAndDeleteIndex(sqlite*,Index*);
void sqliteCopy(Parse*, Token*, Token*, Token*, int);
void sqliteCopy(Parse*, SrcList*, Token*, Token*, int);
void sqliteVacuum(Parse*, Token*);
int sqliteGlobCompare(const unsigned char*,const unsigned char*);
int sqliteLikeCompare(const unsigned char*,const unsigned char*);
@@ -1043,9 +1052,9 @@ int sqliteSafetyOn(sqlite*);
int sqliteSafetyOff(sqlite*);
int sqliteSafetyCheck(sqlite*);
void sqliteChangeCookie(sqlite*, Vdbe*);
void sqliteCreateTrigger(Parse*, Token*, int, int, IdList*, Token*,
void sqliteCreateTrigger(Parse*, Token*, int, int, IdList*, SrcList*,
int, Expr*, TriggerStep*, Token*);
void sqliteDropTrigger(Parse*, Token*, int);
void sqliteDropTrigger(Parse*, SrcList*, int);
int sqliteTriggersExist(Parse* , Trigger* , int , int , int, ExprList*);
int sqliteCodeRowTrigger(Parse*, int, ExprList*, int, Table *, int, int,
int, int);