680 lines
No EOL
18 KiB
C#
680 lines
No EOL
18 KiB
C#
using System;
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using System.Diagnostics;
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using System.Text;
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using u8 = System.Byte;
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namespace Community.CsharpSqlite
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{
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using sqlite3_value = Sqlite3.Mem;
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public partial class Sqlite3
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{
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/*
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** 2003 April 6
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains code used to implement the ATTACH and DETACH commands.
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*************************************************************************
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** Included in SQLite3 port to C#-SQLite; 2008 Noah B Hart
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** C#-SQLite is an independent reimplementation of the SQLite software library
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**
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** SQLITE_SOURCE_ID: 2011-06-23 19:49:22 4374b7e83ea0a3fbc3691f9c0c936272862f32f2
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**
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*************************************************************************
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*/
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//#include "sqliteInt.h"
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#if !SQLITE_OMIT_ATTACH
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/*
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** Resolve an expression that was part of an ATTACH or DETACH statement. This
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** is slightly different from resolving a normal SQL expression, because simple
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** identifiers are treated as strings, not possible column names or aliases.
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**
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** i.e. if the parser sees:
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**
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** ATTACH DATABASE abc AS def
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**
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** it treats the two expressions as literal strings 'abc' and 'def' instead of
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** looking for columns of the same name.
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**
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** This only applies to the root node of pExpr, so the statement:
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**
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** ATTACH DATABASE abc||def AS 'db2'
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**
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** will fail because neither abc or def can be resolved.
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*/
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private static int resolveAttachExpr(NameContext pName, Expr pExpr)
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{
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int rc = SQLITE_OK;
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if (pExpr != null)
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{
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if (pExpr.op != TK_ID)
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{
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rc = sqlite3ResolveExprNames(pName, ref pExpr);
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if (rc == SQLITE_OK && sqlite3ExprIsConstant(pExpr) == 0)
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{
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sqlite3ErrorMsg(pName.pParse, "invalid name: \"%s\"", pExpr.u.zToken);
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return SQLITE_ERROR;
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}
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}
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else
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{
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pExpr.op = TK_STRING;
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}
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}
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return rc;
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}
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/*
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** An SQL user-function registered to do the work of an ATTACH statement. The
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** three arguments to the function come directly from an attach statement:
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**
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** ATTACH DATABASE x AS y KEY z
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**
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** SELECT sqlite_attach(x, y, z)
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**
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** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the
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** third argument.
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*/
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private static void attachFunc(
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sqlite3_context context,
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int NotUsed,
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sqlite3_value[] argv
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)
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{
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int i;
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int rc = 0;
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sqlite3 db = sqlite3_context_db_handle(context);
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string zName;
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string zFile;
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string zPath = "";
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string zErr = "";
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int flags;
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Db aNew = null;
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string zErrDyn = "";
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sqlite3_vfs pVfs = null;
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UNUSED_PARAMETER(NotUsed);
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zFile = argv[0].z != null && (argv[0].z.Length > 0) && argv[0].flags != MEM_Null ? sqlite3_value_text(argv[0]) : "";
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zName = argv[1].z != null && (argv[1].z.Length > 0) && argv[1].flags != MEM_Null ? sqlite3_value_text(argv[1]) : "";
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//if( zFile==null ) zFile = "";
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//if ( zName == null ) zName = "";
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/* Check for the following errors:
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**
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** * Too many attached databases,
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** * Transaction currently open
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** * Specified database name already being used.
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*/
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if (db.nDb >= db.aLimit[SQLITE_LIMIT_ATTACHED] + 2)
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{
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zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d",
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db.aLimit[SQLITE_LIMIT_ATTACHED]
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);
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goto attach_error;
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}
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if (0 == db.autoCommit)
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{
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zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");
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goto attach_error;
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}
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for (i = 0; i < db.nDb; i++)
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{
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string z = db.aDb[i].zName;
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Debug.Assert(z != null && zName != null);
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if (z.Equals(zName, StringComparison.OrdinalIgnoreCase))
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{
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zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
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goto attach_error;
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}
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}
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/* Allocate the new entry in the db.aDb[] array and initialise the schema
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** hash tables.
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*/
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/* Allocate the new entry in the db.aDb[] array and initialise the schema
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** hash tables.
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*/
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//if( db.aDb==db.aDbStatic ){
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// aNew = sqlite3DbMallocRaw(db, sizeof(db.aDb[0])*3 );
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// if( aNew==0 ) return;
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// memcpy(aNew, db.aDb, sizeof(db.aDb[0])*2);
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//}else {
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if (db.aDb.Length <= db.nDb)
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Array.Resize(ref db.aDb, db.nDb + 1);//aNew = sqlite3DbRealloc(db, db.aDb, sizeof(db.aDb[0])*(db.nDb+1) );
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if (db.aDb == null)
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return; // if( aNew==0 ) return;
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//}
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db.aDb[db.nDb] = new Db();//db.aDb = aNew;
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aNew = db.aDb[db.nDb];//memset(aNew, 0, sizeof(*aNew));
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// memset(aNew, 0, sizeof(*aNew));
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/* Open the database file. If the btree is successfully opened, use
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** it to obtain the database schema. At this point the schema may
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** or may not be initialised.
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*/
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flags = (int)db.openFlags;
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rc = sqlite3ParseUri(vfsList.zName, zFile, ref flags, ref pVfs, ref zPath, ref zErr);
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if (rc != SQLITE_OK)
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{
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//if ( rc == SQLITE_NOMEM )
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//db.mallocFailed = 1;
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sqlite3_result_error(context, zErr, -1);
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//sqlite3_free( zErr );
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return;
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}
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Debug.Assert(pVfs != null);
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flags |= SQLITE_OPEN_MAIN_DB;
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rc = sqlite3BtreeOpen(pVfs, zPath, db, ref aNew.pBt, 0, (int)flags);
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//sqlite3_free( zPath );
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db.nDb++;
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if (rc == SQLITE_CONSTRAINT)
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{
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rc = SQLITE_ERROR;
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zErrDyn = sqlite3MPrintf(db, "database is already attached");
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}
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else if (rc == SQLITE_OK)
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{
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Pager pPager;
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aNew.pSchema = sqlite3SchemaGet(db, aNew.pBt);
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//if ( aNew.pSchema == null )
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//{
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// rc = SQLITE_NOMEM;
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//}
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//else
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if (aNew.pSchema.file_format != 0 && aNew.pSchema.enc != ENC(db))
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{
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zErrDyn = sqlite3MPrintf(db,
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"attached databases must use the same text encoding as main database");
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rc = SQLITE_ERROR;
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}
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pPager = sqlite3BtreePager(aNew.pBt);
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sqlite3PagerLockingMode(pPager, db.dfltLockMode);
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sqlite3BtreeSecureDelete(aNew.pBt,
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sqlite3BtreeSecureDelete(db.aDb[0].pBt, -1));
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}
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aNew.safety_level = 3;
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aNew.zName = zName;//sqlite3DbStrDup(db, zName);
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//if( rc==SQLITE_OK && aNew.zName==0 ){
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// rc = SQLITE_NOMEM;
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//}
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#if SQLITE_HAS_CODEC
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if (rc == SQLITE_OK)
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{
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//extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
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//extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
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int nKey;
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string zKey;
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int t = sqlite3_value_type(argv[2]);
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switch (t)
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{
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case SQLITE_INTEGER:
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case SQLITE_FLOAT:
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zErrDyn = "Invalid key value"; //sqlite3DbStrDup( db, "Invalid key value" );
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rc = SQLITE_ERROR;
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break;
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case SQLITE_TEXT:
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case SQLITE_BLOB:
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nKey = sqlite3_value_bytes(argv[2]);
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zKey = sqlite3_value_blob(argv[2]).ToString(); // (char *)sqlite3_value_blob(argv[2]);
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rc = sqlite3CodecAttach(db, db.nDb - 1, zKey, nKey);
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break;
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case SQLITE_NULL:
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/* No key specified. Use the key from the main database */
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sqlite3CodecGetKey(db, 0, out zKey, out nKey); //sqlite3CodecGetKey(db, 0, (void**)&zKey, nKey);
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if (nKey > 0 || sqlite3BtreeGetReserve(db.aDb[0].pBt) > 0)
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{
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rc = sqlite3CodecAttach(db, db.nDb - 1, zKey, nKey);
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}
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break;
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}
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}
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#endif
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/* If the file was opened successfully, read the schema for the new database.
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** If this fails, or if opening the file failed, then close the file and
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** remove the entry from the db.aDb[] array. i.e. put everything back the way
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** we found it.
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*/
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if (rc == SQLITE_OK)
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{
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sqlite3BtreeEnterAll(db);
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rc = sqlite3Init(db, ref zErrDyn);
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sqlite3BtreeLeaveAll(db);
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}
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if (rc != 0)
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{
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int iDb = db.nDb - 1;
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Debug.Assert(iDb >= 2);
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if (db.aDb[iDb].pBt != null)
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{
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sqlite3BtreeClose(ref db.aDb[iDb].pBt);
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db.aDb[iDb].pBt = null;
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db.aDb[iDb].pSchema = null;
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}
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sqlite3ResetInternalSchema(db, -1);
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db.nDb = iDb;
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if (rc == SQLITE_NOMEM || rc == SQLITE_IOERR_NOMEM)
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{
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//// db.mallocFailed = 1;
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sqlite3DbFree(db, ref zErrDyn);
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zErrDyn = sqlite3MPrintf(db, "out of memory");
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}
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else if (zErrDyn == "")
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{
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zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
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}
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goto attach_error;
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}
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return;
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attach_error:
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/* Return an error if we get here */
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if (zErrDyn != "")
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{
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sqlite3_result_error(context, zErrDyn, -1);
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sqlite3DbFree(db, ref zErrDyn);
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}
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if (rc != 0)
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sqlite3_result_error_code(context, rc);
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}
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/*
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** An SQL user-function registered to do the work of an DETACH statement. The
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** three arguments to the function come directly from a detach statement:
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**
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** DETACH DATABASE x
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**
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** SELECT sqlite_detach(x)
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*/
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private static void detachFunc(
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sqlite3_context context,
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int NotUsed,
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sqlite3_value[] argv
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)
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{
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string zName = zName = argv[0].z != null && (argv[0].z.Length > 0) ? sqlite3_value_text(argv[0]) : "";//(sqlite3_value_text(argv[0]);
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sqlite3 db = sqlite3_context_db_handle(context);
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int i;
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Db pDb = null;
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StringBuilder zErr = new StringBuilder(200);
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UNUSED_PARAMETER(NotUsed);
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if (zName == null)
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zName = "";
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for (i = 0; i < db.nDb; i++)
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{
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pDb = db.aDb[i];
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if (pDb.pBt == null)
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continue;
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if (pDb.zName.Equals(zName, StringComparison.OrdinalIgnoreCase))
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break;
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}
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if (i >= db.nDb)
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{
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sqlite3_snprintf(200, zErr, "no such database: %s", zName);
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goto detach_error;
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}
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if (i < 2)
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{
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sqlite3_snprintf(200, zErr, "cannot detach database %s", zName);
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goto detach_error;
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}
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if (0 == db.autoCommit)
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{
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sqlite3_snprintf(200, zErr,
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"cannot DETACH database within transaction");
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goto detach_error;
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}
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if (sqlite3BtreeIsInReadTrans(pDb.pBt) || sqlite3BtreeIsInBackup(pDb.pBt))
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{
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sqlite3_snprintf(200, zErr, "database %s is locked", zName);
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goto detach_error;
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}
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sqlite3BtreeClose(ref pDb.pBt);
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pDb.pBt = null;
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pDb.pSchema = null;
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sqlite3ResetInternalSchema(db, -1);
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return;
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detach_error:
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sqlite3_result_error(context, zErr.ToString(), -1);
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}
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/*
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** This procedure generates VDBE code for a single invocation of either the
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** sqlite_detach() or sqlite_attach() SQL user functions.
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*/
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private static void codeAttach(
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Parse pParse, /* The parser context */
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int type, /* Either SQLITE_ATTACH or SQLITE_DETACH */
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FuncDef pFunc, /* FuncDef wrapper for detachFunc() or attachFunc() */
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Expr pAuthArg, /* Expression to pass to authorization callback */
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Expr pFilename, /* Name of database file */
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Expr pDbname, /* Name of the database to use internally */
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Expr pKey /* Database key for encryption extension */
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)
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{
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NameContext sName;
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Vdbe v;
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sqlite3 db = pParse.db;
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int regArgs;
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sName = new NameContext();// memset( &sName, 0, sizeof(NameContext));
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sName.pParse = pParse;
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if (
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SQLITE_OK != resolveAttachExpr(sName, pFilename) ||
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SQLITE_OK != resolveAttachExpr(sName, pDbname) ||
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SQLITE_OK != resolveAttachExpr(sName, pKey)
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)
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{
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pParse.nErr++;
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goto attach_end;
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}
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#if !SQLITE_OMIT_AUTHORIZATION
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if( pAuthArg ){
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char *zAuthArg;
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if( pAuthArg->op==TK_STRING ){
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zAuthArg = pAuthArg->u.zToken;
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}else{
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zAuthArg = 0;
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}
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int rc = sqlite3AuthCheck(pParse, type, zAuthArg, 0, 0);
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if(rc!=SQLITE_OK ){
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goto attach_end;
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}
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}
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#endif //* SQLITE_OMIT_AUTHORIZATION */
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v = sqlite3GetVdbe(pParse);
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regArgs = sqlite3GetTempRange(pParse, 4);
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sqlite3ExprCode(pParse, pFilename, regArgs);
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sqlite3ExprCode(pParse, pDbname, regArgs + 1);
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sqlite3ExprCode(pParse, pKey, regArgs + 2);
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Debug.Assert(v != null /*|| db.mallocFailed != 0 */ );
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if (v != null)
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{
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sqlite3VdbeAddOp3(v, OP_Function, 0, regArgs + 3 - pFunc.nArg, regArgs + 3);
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Debug.Assert(pFunc.nArg == -1 || (pFunc.nArg & 0xff) == pFunc.nArg);
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sqlite3VdbeChangeP5(v, (u8)(pFunc.nArg));
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sqlite3VdbeChangeP4(v, -1, pFunc, P4_FUNCDEF);
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/* Code an OP_Expire. For an ATTACH statement, set P1 to true (expire this
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** statement only). For DETACH, set it to false (expire all existing
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** statements).
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*/
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sqlite3VdbeAddOp1(v, OP_Expire, (type == SQLITE_ATTACH) ? 1 : 0);
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}
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attach_end:
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sqlite3ExprDelete(db, ref pFilename);
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sqlite3ExprDelete(db, ref pDbname);
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sqlite3ExprDelete(db, ref pKey);
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}
|
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|
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/*
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** Called by the parser to compile a DETACH statement.
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**
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** DETACH pDbname
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*/
|
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private static FuncDef detach_func = new FuncDef(
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1, /* nArg */
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SQLITE_UTF8, /* iPrefEnc */
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0, /* flags */
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null, /* pUserData */
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null, /* pNext */
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detachFunc, /* xFunc */
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null, /* xStep */
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null, /* xFinalize */
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"sqlite_detach", /* zName */
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null, /* pHash */
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null /* pDestructor */
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);
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private static void sqlite3Detach(Parse pParse, Expr pDbname)
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{
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codeAttach(pParse, SQLITE_DETACH, detach_func, pDbname, null, null, pDbname);
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}
|
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/*
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** Called by the parser to compile an ATTACH statement.
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**
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** ATTACH p AS pDbname KEY pKey
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*/
|
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private static FuncDef attach_func = new FuncDef(
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3, /* nArg */
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SQLITE_UTF8, /* iPrefEnc */
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0, /* flags */
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null, /* pUserData */
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null, /* pNext */
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attachFunc, /* xFunc */
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null, /* xStep */
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null, /* xFinalize */
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"sqlite_attach", /* zName */
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null, /* pHash */
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null /* pDestructor */
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);
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private static void sqlite3Attach(Parse pParse, Expr p, Expr pDbname, Expr pKey)
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{
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codeAttach(pParse, SQLITE_ATTACH, attach_func, p, p, pDbname, pKey);
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}
|
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|
|
#endif // * SQLITE_OMIT_ATTACH */
|
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|
|
/*
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|
** Initialize a DbFixer structure. This routine must be called prior
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|
** to passing the structure to one of the sqliteFixAAAA() routines below.
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|
**
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|
** The return value indicates whether or not fixation is required. TRUE
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|
** means we do need to fix the database references, FALSE means we do not.
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|
*/
|
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private static int sqlite3FixInit(
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|
DbFixer pFix, /* The fixer to be initialized */
|
|
Parse pParse, /* Error messages will be written here */
|
|
int iDb, /* This is the database that must be used */
|
|
string zType, /* "view", "trigger", or "index" */
|
|
Token pName /* Name of the view, trigger, or index */
|
|
)
|
|
{
|
|
sqlite3 db;
|
|
|
|
if (NEVER(iDb < 0) || iDb == 1)
|
|
return 0;
|
|
db = pParse.db;
|
|
Debug.Assert(db.nDb > iDb);
|
|
pFix.pParse = pParse;
|
|
pFix.zDb = db.aDb[iDb].zName;
|
|
pFix.zType = zType;
|
|
pFix.pName = pName;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
** The following set of routines walk through the parse tree and assign
|
|
** a specific database to all table references where the database name
|
|
** was left unspecified in the original SQL statement. The pFix structure
|
|
** must have been initialized by a prior call to sqlite3FixInit().
|
|
**
|
|
** These routines are used to make sure that an index, trigger, or
|
|
** view in one database does not refer to objects in a different database.
|
|
** (Exception: indices, triggers, and views in the TEMP database are
|
|
** allowed to refer to anything.) If a reference is explicitly made
|
|
** to an object in a different database, an error message is added to
|
|
** pParse.zErrMsg and these routines return non-zero. If everything
|
|
** checks out, these routines return 0.
|
|
*/
|
|
|
|
private static int sqlite3FixSrcList(
|
|
DbFixer pFix, /* Context of the fixation */
|
|
SrcList pList /* The Source list to check and modify */
|
|
)
|
|
{
|
|
int i;
|
|
string zDb;
|
|
SrcList_item pItem;
|
|
|
|
if (NEVER(pList == null))
|
|
return 0;
|
|
zDb = pFix.zDb;
|
|
for (i = 0; i < pList.nSrc; i++)
|
|
{//, pItem++){
|
|
pItem = pList.a[i];
|
|
if (pItem.zDatabase == null)
|
|
{
|
|
pItem.zDatabase = zDb;// sqlite3DbStrDup( pFix.pParse.db, zDb );
|
|
}
|
|
else if (!pItem.zDatabase.Equals(zDb, StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
sqlite3ErrorMsg(pFix.pParse,
|
|
"%s %T cannot reference objects in database %s",
|
|
pFix.zType, pFix.pName, pItem.zDatabase);
|
|
return 1;
|
|
}
|
|
#if !SQLITE_OMIT_VIEW || !SQLITE_OMIT_TRIGGER
|
|
if (sqlite3FixSelect(pFix, pItem.pSelect) != 0)
|
|
return 1;
|
|
if (sqlite3FixExpr(pFix, pItem.pOn) != 0)
|
|
return 1;
|
|
#endif
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#if !SQLITE_OMIT_VIEW || !SQLITE_OMIT_TRIGGER
|
|
|
|
private static int sqlite3FixSelect(
|
|
DbFixer pFix, /* Context of the fixation */
|
|
Select pSelect /* The SELECT statement to be fixed to one database */
|
|
)
|
|
{
|
|
while (pSelect != null)
|
|
{
|
|
if (sqlite3FixExprList(pFix, pSelect.pEList) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (sqlite3FixSrcList(pFix, pSelect.pSrc) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (sqlite3FixExpr(pFix, pSelect.pWhere) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (sqlite3FixExpr(pFix, pSelect.pHaving) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
pSelect = pSelect.pPrior;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
private static int sqlite3FixExpr(
|
|
DbFixer pFix, /* Context of the fixation */
|
|
Expr pExpr /* The expression to be fixed to one database */
|
|
)
|
|
{
|
|
while (pExpr != null)
|
|
{
|
|
if (ExprHasAnyProperty(pExpr, EP_TokenOnly))
|
|
break;
|
|
if (ExprHasProperty(pExpr, EP_xIsSelect))
|
|
{
|
|
if (sqlite3FixSelect(pFix, pExpr.x.pSelect) != 0)
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
if (sqlite3FixExprList(pFix, pExpr.x.pList) != 0)
|
|
return 1;
|
|
}
|
|
if (sqlite3FixExpr(pFix, pExpr.pRight) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
pExpr = pExpr.pLeft;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
private static int sqlite3FixExprList(
|
|
DbFixer pFix, /* Context of the fixation */
|
|
ExprList pList /* The expression to be fixed to one database */
|
|
)
|
|
{
|
|
int i;
|
|
ExprList_item pItem;
|
|
if (pList == null)
|
|
return 0;
|
|
for (i = 0; i < pList.nExpr; i++)//, pItem++ )
|
|
{
|
|
pItem = pList.a[i];
|
|
if (sqlite3FixExpr(pFix, pItem.pExpr) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if !SQLITE_OMIT_TRIGGER
|
|
|
|
private static int sqlite3FixTriggerStep(
|
|
DbFixer pFix, /* Context of the fixation */
|
|
TriggerStep pStep /* The trigger step be fixed to one database */
|
|
)
|
|
{
|
|
while (pStep != null)
|
|
{
|
|
if (sqlite3FixSelect(pFix, pStep.pSelect) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (sqlite3FixExpr(pFix, pStep.pWhere) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
if (sqlite3FixExprList(pFix, pStep.pExprList) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
pStep = pStep.pNext;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
}
|
|
} |