本文整理汇总了C#中Parse.MayAbort方法的典型用法代码示例。如果您正苦于以下问题:C# Parse.MayAbort方法的具体用法?C# Parse.MayAbort怎么用?C# Parse.MayAbort使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Parse
的用法示例。
在下文中一共展示了Parse.MayAbort方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: RenameTable
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.
//.........这里部分代码省略.........