public static void MaterializeView(Parse parse, Table view, Expr where_, int curId) { Context ctx = parse.Ctx; int db = Prepare.SchemaToIndex(ctx, view.Schema); where_ = Expr.Dup(ctx, where_, 0); SrcList from = Parse.SrcListAppend(ctx, null, null, null); if (from != null) { Debug.Assert(from.Srcs == 1); from.Ids[0].Name = view.Name; from.Ids[0].Database = ctx.DBs[db].Name; Debug.Assert(from.Ids[0].On == null); Debug.Assert(from.Ids[0].Using == null); } Select select = Select.New(parse, 0, from, where_, 0, 0, 0, 0, 0, 0); if (select != null) select.SelFlags |= SF.Materialize; SelectDest dest = new SelectDest(); Select.DestInit(dest, SRT.EphemTab, curId); Select.Select(parse, select, dest); Select.Delete(ctx, select); }
static void ReloadTableSchema(Parse parse, Table table, string name) { Context ctx = parse.Ctx; string where_; #if !SQLITE_OMIT_TRIGGER Trigger trig; #endif Vdbe v = parse.GetVdbe(); if (C._NEVER(v == null)) { return; } Debug.Assert(Btree.HoldsAllMutexes(ctx)); int db = Prepare.SchemaToIndex(ctx, table.Schema); // Index of database containing pTab Debug.Assert(db >= 0); #if !OMIT_TRIGGER // Drop any table triggers from the internal schema. for (trig = Trigger.List(parse, table); trig != null; trig = trig.Next) { int trigDb = Prepare.SchemaToIndex(ctx, trig.Schema); Debug.Assert(trigDb == db || trigDb == 1); v.AddOp4(OP.DropTrigger, trigDb, 0, 0, trig.Name, 0); } #endif // Drop the table and index from the internal schema. v.AddOp4(OP.DropTable, db, 0, 0, table.Name, 0); // Reload the table, index and permanent trigger schemas. where_ = C._mtagprintf(ctx, "tbl_name=%Q", name); if (where_ == null) { return; } v.AddParseSchemaOp(db, where_); #if !OMIT_TRIGGER // Now, if the table is not stored in the temp database, reload any temp triggers. Don't use IN(...) in case SQLITE_OMIT_SUBQUERY is defined. if ((where_ = WhereTempTriggers(parse, table)) != "") { v.AddParseSchemaOp(1, where_); } #endif }
public static void BeginAddColumn(Parse parse, SrcList src) { Context ctx = parse.Ctx; // Look up the table being altered. Debug.Assert(parse.NewTable == null); Debug.Assert(Btree.HoldsAllMutexes(ctx)); //if (ctx.MallocFailed) goto exit_begin_add_column; Table table = parse.LocateTableItem(false, src.Ids[0]); if (table == null) { goto exit_begin_add_column; } #if !OMIT_VIRTUALTABLE if (IsVirtual(table)) { parse.ErrorMsg("virtual tables may not be altered"); goto exit_begin_add_column; } #endif // Make sure this is not an attempt to ALTER a view. if (table.Select != null) { parse.ErrorMsg("Cannot add a column to a view"); goto exit_begin_add_column; } if (IsSystemTable(parse, table.Name)) { goto exit_begin_add_column; } Debug.Assert(table.AddColOffset > 0); int db = Prepare.SchemaToIndex(ctx, table.Schema); // Put a copy of the Table struct in Parse.pNewTable for the sqlite3AddColumn() function and friends to modify. But modify // the name by adding an "sqlite_altertab_" prefix. By adding this prefix, we insure that the name will not collide with an existing // table because user table are not allowed to have the "sqlite_" prefix on their name. Table newTable = new Table(); if (newTable == null) { goto exit_begin_add_column; } parse.NewTable = newTable; newTable.Refs = 1; newTable.Cols.length = table.Cols.length; Debug.Assert(newTable.Cols.length > 0); int allocs = (((newTable.Cols.length - 1) / 8) * 8) + 8; Debug.Assert(allocs >= newTable.Cols.length && allocs % 8 == 0 && allocs - newTable.Cols.length < 8); newTable.Cols.data = new Column[allocs]; newTable.Name = C._mtagprintf(ctx, "sqlite_altertab_%s", table.Name); if (newTable.Cols.data == null || newTable.Name == null) { ctx.MallocFailed = true; goto exit_begin_add_column; } for (int i = 0; i < newTable.Cols.length; i++) { Column col = table.Cols[i].memcpy(); col.Coll = null; col.Type = null; col.Dflt = null; col.Dflt = null; newTable.Cols[i] = col; } newTable.Schema = ctx.DBs[db].Schema; newTable.AddColOffset = table.AddColOffset; newTable.Refs = 1; // Begin a transaction and increment the schema cookie. parse.BeginWriteOperation(0, db); Vdbe v = parse.V; if (v == null) { goto exit_begin_add_column; } parse.ChangeCookie(db); exit_begin_add_column: sqlite3SrcListDelete(ctx, ref src); return; }
public static void FinishAddColumn(Parse parse, Token colDef) { Context ctx = parse.Ctx; // The database connection if (parse.Errs != 0 || ctx.MallocFailed) { return; } Table newTable = parse.NewTable; // Copy of pParse.pNewTable Debug.Assert(newTable != null); Debug.Assert(Btree.HoldsAllMutexes(ctx)); int db = Prepare.SchemaToIndex(ctx, newTable.Schema); // Database number string dbName = ctx.DBs[db].Name; // Database name string tableName = newTable.Name.Substring(16); // Table name: Skip the "sqlite_altertab_" prefix on the name Column col = newTable.Cols[newTable.Cols.length - 1]; // The new column Expr dflt = col.Dflt; // Default value for the new column Table table = Parse.FindTable(ctx, tableName, dbName); // Table being altered Debug.Assert(table != null); #if !OMIT_AUTHORIZATION // Invoke the authorization callback. if (Auth.Check(parse, AUTH.ALTER_TABLE, dbName, table.Name, null)) { return; } #endif // If the default value for the new column was specified with a literal NULL, then set pDflt to 0. This simplifies checking // for an SQL NULL default below. if (dflt != null && dflt.OP == TK.NULL) { dflt = null; } // Check that the new column is not specified as PRIMARY KEY or UNIQUE. If there is a NOT NULL constraint, then the default value for the // column must not be NULL. if ((col.ColFlags & COLFLAG.PRIMKEY) != 0) { parse.ErrorMsg("Cannot add a PRIMARY KEY column"); return; } if (newTable.Index != null) { parse.ErrorMsg("Cannot add a UNIQUE column"); return; } if ((ctx.Flags & Context.FLAG.ForeignKeys) != 0 && newTable.FKeys != null && dflt != null) { parse.ErrorMsg("Cannot add a REFERENCES column with non-NULL default value"); return; } if (col.NotNull != 0 && dflt == null) { parse.ErrorMsg("Cannot add a NOT NULL column with default value NULL"); return; } // Ensure the default expression is something that sqlite3ValueFromExpr() can handle (i.e. not CURRENT_TIME etc.) if (dflt != null) { Mem val = null; if (Mem_FromExpr(ctx, dflt, TEXTENCODE.UTF8, AFF.NONE, ref val) != 0) { ctx.MallocFailed = true; return; } if (val == null) { parse.ErrorMsg("Cannot add a column with non-constant default"); return; } Mem_Free(ref val); } // Modify the CREATE TABLE statement. string colDefAsString = colDef.data.Substring(0, (int)colDef.length).Replace(";", " ").Trim(); // Null-terminated column definition if (colDefAsString != null) { Context.FLAG savedDbFlags = ctx.Flags; ctx.Flags |= Context.FLAG.PreferBuiltin; parse.NestedParse( "UPDATE \"%w\".%s SET " + "sql = substr(sql,1,%d) || ', ' || %Q || substr(sql,%d) " + "WHERE type = 'table' AND name = %Q", dbName, E.SCHEMA_TABLE(db), newTable.AddColOffset, colDefAsString, newTable.AddColOffset + 1, tableName); C._tagfree(ctx, ref colDefAsString); ctx.Flags = savedDbFlags; } // If the default value of the new column is NULL, then set the file format to 2. If the default value of the new column is not NULL, // the file format becomes 3. MinimumFileFormat(parse, db, (dflt != null ? 3 : 2)); // Reload the schema of the modified table. ReloadTableSchema(parse, table, table.Name); }
public static void RenameTable(Parse parse, SrcList src, Token name) { Context ctx = parse.Ctx; // Database connection Context.FLAG savedDbFlags = ctx.Flags; // Saved value of db->flags //if (C._NEVER(ctx.MallocFailed)) goto exit_rename_table; Debug.Assert(src.Srcs == 1); Debug.Assert(Btree.HoldsAllMutexes(ctx)); Table table = parse.LocateTableItem(false, src.Ids[0]); // Table being renamed if (table == null) { goto exit_rename_table; } int db = Prepare.SchemaToIndex(ctx, table.Schema); // Database that contains the table string dbName = ctx.DBs[db].Name; // Name of database iDb ctx.Flags |= Context.FLAG.PreferBuiltin; // Get a NULL terminated version of the new table name. string nameAsString = Parse.NameFromToken(ctx, name); // NULL-terminated version of pName if (nameAsString == null) { goto exit_rename_table; } // Check that a table or index named 'zName' does not already exist in database iDb. If so, this is an error. if (Parse.FindTable(ctx, nameAsString, dbName) != null || Parse.FindIndex(ctx, nameAsString, dbName) != null) { parse.ErrorMsg("there is already another table or index with this name: %s", nameAsString); goto exit_rename_table; } // Make sure it is not a system table being altered, or a reserved name that the table is being renamed to. if (IsSystemTable(parse, table.Name) || parse->CheckObjectName(nameAsString) != RC.OK) { goto exit_rename_table; } #if !OMIT_VIEW if (table.Select != null) { parse.ErrorMsg("view %s may not be altered", table.Name); goto exit_rename_table; } #endif #if !OMIT_AUTHORIZATION // Invoke the authorization callback. if (Auth.Check(parse, AUTH.ALTER_TABLE, dbName, table.Name, null)) { goto exit_rename_table; } #endif VTable vtable = null; // Non-zero if this is a v-tab with an xRename() #if !OMIT_VIRTUALTABLE if (parse->ViewGetColumnNames(table) != 0) { goto exit_rename_table; } if (E.IsVirtual(table)) { vtable = VTable.GetVTable(ctx, table); if (vtable.IVTable.IModule.Rename == null) { vtable = null; } } #endif // Begin a transaction and code the VerifyCookie for database iDb. Then modify the schema cookie (since the ALTER TABLE modifies the // schema). Open a statement transaction if the table is a virtual table. Vdbe v = parse.GetVdbe(); if (v == null) { goto exit_rename_table; } parse.BeginWriteOperation((vtable != null ? 1 : 0), db); parse.ChangeCookie(db); // If this is a virtual table, invoke the xRename() function if one is defined. The xRename() callback will modify the names // of any resources used by the v-table implementation (including other SQLite tables) that are identified by the name of the virtual table. #if !OMIT_VIRTUALTABLE if (vtable != null) { int i = ++parse.Mems; v.AddOp4(OP.String8, 0, i, 0, nameAsString, 0); v.AddOp4(OP.VRename, i, 0, 0, vtable, Vdbe.P4T.VTAB); parse.MayAbort(); } #endif // figure out how many UTF-8 characters are in zName string tableName = table.Name; // Original name of the table int tableNameLength = C._utf8charlength(tableName, -1); // Number of UTF-8 characters in zTabName #if !OMIT_TRIGGER string where_ = string.Empty; // Where clause to locate temp triggers #endif #if !OMIT_FOREIGN_KEY && !OMIT_TRIGGER if ((ctx.Flags & Context.FLAG.ForeignKeys) != 0) { // If foreign-key support is enabled, rewrite the CREATE TABLE statements corresponding to all child tables of foreign key constraints // for which the renamed table is the parent table. if ((where_ = WhereForeignKeys(parse, table)) != null) { parse.NestedParse( "UPDATE \"%w\".%s SET " + "sql = sqlite_rename_parent(sql, %Q, %Q) " + "WHERE %s;", dbName, E.SCHEMA_TABLE(db), tableName, nameAsString, where_); C._tagfree(ctx, ref where_); } } #endif // Modify the sqlite_master table to use the new table name. parse.NestedParse( "UPDATE %Q.%s SET " + #if OMIT_TRIGGER "sql = sqlite_rename_table(sql, %Q), " + #else "sql = CASE " + "WHEN type = 'trigger' THEN sqlite_rename_trigger(sql, %Q)" + "ELSE sqlite_rename_table(sql, %Q) END, " + #endif "tbl_name = %Q, " + "name = CASE " + "WHEN type='table' THEN %Q " + "WHEN name LIKE 'sqlite_autoindex%%' AND type='index' THEN " + "'sqlite_autoindex_' || %Q || substr(name,%d+18) " + "ELSE name END " + "WHERE tbl_name=%Q AND " + "(type='table' OR type='index' OR type='trigger');", dbName, SCHEMA_TABLE(db), nameAsString, nameAsString, nameAsString, #if !OMIT_TRIGGER nameAsString, #endif nameAsString, tableNameLength, tableName); #if !OMIT_AUTOINCREMENT // If the sqlite_sequence table exists in this database, then update it with the new table name. if (Parse.FindTable(ctx, "sqlite_sequence", dbName) != null) { parse.NestedParse( "UPDATE \"%w\".sqlite_sequence set name = %Q WHERE name = %Q", dbName, nameAsString, table.Name); } #endif #if !OMIT_TRIGGER // If there are TEMP triggers on this table, modify the sqlite_temp_master table. Don't do this if the table being ALTERed is itself located in the temp database. if ((where_ = WhereTempTriggers(parse, table)) != "") { parse.NestedParse( "UPDATE sqlite_temp_master SET " + "sql = sqlite_rename_trigger(sql, %Q), " + "tbl_name = %Q " + "WHERE %s;", nameAsString, nameAsString, where_); C._tagfree(ctx, ref where_); } #endif #if !(OMIT_FOREIGN_KEY) && !(OMIT_TRIGGER) if ((ctx.Flags & Context.FLAG.ForeignKeys) != 0) { for (FKey p = Parse.FkReferences(table); p != null; p = p.NextTo) { Table from = p.From; if (from != table) { ReloadTableSchema(parse, p.From, from.Name); } } } #endif // Drop and reload the internal table schema. ReloadTableSchema(parse, table, nameAsString); exit_rename_table: Expr.SrcListDelete(ctx, ref src); C._tagfree(ctx, ref nameAsString); ctx.Flags = savedDbFlags; }