Split the implementation of COPY, PRAGMA, and ATTACH into separate

source code files. (CVS 902) FossilOrigin-Name: 73359037ea639abb066c74db9c19e84bf1104006
2025-11-14 00:22:38 +03:00 · 2003-04-06 21:08:24 +00:00
parent e1051c653e
commit c11d4f9360
9 changed files with 793 additions and 680 deletions
--- a/src/attach.c
+++ b/src/attach.c
@@ -0,0 +1,129 @@
+/*
+** 2003 April 6
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file contains code used to implement the ATTACH and DETACH commands.
+**
+** $Id: attach.c,v 1.1 2003/04/06 21:08:24 drh Exp $
+*/
+#include "sqliteInt.h"
+
+/*
+** This routine is called by the parser to process an ATTACH statement:
+**
+**     ATTACH DATABASE filename AS dbname
+**
+** The pFilename and pDbname arguments are the tokens that define the
+** filename and dbname in the ATTACH statement.
+*/
+void sqliteAttach(Parse *pParse, Token *pFilename, Token *pDbname){
+  Db *aNew;
+  int rc, i;
+  char *zFile, *zName;
+  sqlite *db;
+
+  if( pParse->explain ) return;
+  db = pParse->db;
+  if( db->file_format<4 ){
+    sqliteErrorMsg(pParse, "cannot attach auxiliary databases to an "
+       "older format master database", 0);
+    pParse->rc = SQLITE_ERROR;
+    return;
+  }
+  if( db->nDb>=MAX_ATTACHED+2 ){
+    sqliteErrorMsg(pParse, "too many attached databases - max %d", 
+       MAX_ATTACHED);
+    pParse->rc = SQLITE_ERROR;
+    return;
+  }
+  if( db->aDb==db->aDbStatic ){
+    aNew = sqliteMalloc( sizeof(db->aDb[0])*3 );
+    if( aNew==0 ) return;
+    memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
+  }else{
+    aNew = sqliteRealloc(db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
+    if( aNew==0 ) return;
+  }
+  db->aDb = aNew;
+  aNew = &db->aDb[db->nDb++];
+  memset(aNew, 0, sizeof(*aNew));
+  sqliteHashInit(&aNew->tblHash, SQLITE_HASH_STRING, 0);
+  sqliteHashInit(&aNew->idxHash, SQLITE_HASH_STRING, 0);
+  sqliteHashInit(&aNew->trigHash, SQLITE_HASH_STRING, 0);
+  sqliteHashInit(&aNew->aFKey, SQLITE_HASH_STRING, 1);
+  
+  zName = 0;
+  sqliteSetNString(&zName, pDbname->z, pDbname->n, 0);
+  if( zName==0 ) return;
+  sqliteDequote(zName);
+  for(i=0; i<db->nDb; i++){
+    if( db->aDb[i].zName && sqliteStrICmp(db->aDb[i].zName, zName)==0 ){
+      sqliteErrorMsg(pParse, "database %z is already in use", zName);
+      db->nDb--;
+      pParse->rc = SQLITE_ERROR;
+      return;
+    }
+  }
+  aNew->zName = zName;
+  zFile = 0;
+  sqliteSetNString(&zFile, pFilename->z, pFilename->n, 0);
+  if( zFile==0 ) return;
+  sqliteDequote(zFile);
+  rc = sqliteBtreeOpen(zFile, 0, MAX_PAGES, &aNew->pBt);
+  if( rc ){
+    sqliteErrorMsg(pParse, "unable to open database: %s", zFile);
+  }
+  sqliteFree(zFile);
+  db->flags &= ~SQLITE_Initialized;
+  if( pParse->nErr ) return;
+  rc = sqliteInit(pParse->db, &pParse->zErrMsg);
+  if( rc ){
+    sqliteResetInternalSchema(db, 0);
+    pParse->nErr++;
+    pParse->rc = SQLITE_ERROR;
+  }
+}
+
+/*
+** This routine is called by the parser to process a DETACH statement:
+**
+**    DETACH DATABASE dbname
+**
+** The pDbname argument is the name of the database in the DETACH statement.
+*/
+void sqliteDetach(Parse *pParse, Token *pDbname){
+  int i;
+  sqlite *db;
+
+  if( pParse->explain ) return;
+  db = pParse->db;
+  for(i=0; i<db->nDb; i++){
+    if( db->aDb[i].pBt==0 || db->aDb[i].zName==0 ) continue;
+    if( strlen(db->aDb[i].zName)!=pDbname->n ) continue;
+    if( sqliteStrNICmp(db->aDb[i].zName, pDbname->z, pDbname->n)==0 ) break;
+  }
+  if( i>=db->nDb ){
+    sqliteErrorMsg(pParse, "no such database: %T", pDbname);
+    return;
+  }
+  if( i<2 ){
+    sqliteErrorMsg(pParse, "cannot detach database %T", pDbname);
+    return;
+  }
+  sqliteBtreeClose(db->aDb[i].pBt);
+  db->aDb[i].pBt = 0;
+  sqliteResetInternalSchema(db, i);
+  db->nDb--;
+  if( i<db->nDb ){
+    db->aDb[i] = db->aDb[db->nDb];
+    memset(&db->aDb[db->nDb], 0, sizeof(db->aDb[0]));
+    sqliteResetInternalSchema(db, i);
+  }
+}