Hibernate usesResultSetMetadatato deduce the type of the columns returned by the query, from performance point of view we can useaddScalar()method to define the data type of the column. However we would still ge
Use the Transaction-SQL (T-SQL) editor in the SQL Management Studio to create and test queries to be used for reports. To create a T-SQL query: Log on to Microsoft SQL Server Management Studio and click Connect:In the left pane, expand Databases and expand the database for which you ...
:EXIT(query) Executes the batch that includes the query, and then quits after it returns the results of the query.If RAISERROR is used within a sqlcmd script, and a state of 127 is raised, sqlcmd quits, and returns the message ID back to the client. For example:text...
Advanced Transaction Information Transaction Basics A transaction is a sequence of operations performed as a single logical unit of work. A logical unit of work must exhibit four properties, called the atomicity, consistency, isolation, and durability (ACID) properties, to qualify as a transaction. ...
The following example sets Trace Flag 3205 on for all sessions at the server level by using DBCC TRACEON. SQL Copy DBCC TRACEON (3205, -1); You can enable all plan-affecting hotfixes controlled by trace flags 4199 and 4137 for a particular query. SQL Copy SELECT x FROM correlated ...
The following example creates a SqlConnection and a SqlTransaction. It also demonstrates how to use the BeginTransaction, a Commit, and Rollback methods. C# 复制 private static void ExecuteSqlTransaction(string connectionString) { using (SqlConnection connection = new SqlConnection(connectionString)...
classMigrationName<Gitlab::Database::Migration[2.1]disable_ddl_transaction!end For example: classAddUsersLowerUsernameEmailIndexes<Gitlab::Database::Migration[2.1]disable_ddl_transaction!defupexecute'CREATE INDEX CONCURRENTLY index_on_users_lower_username ON users (LOWER(username));'execute'CREATE INDEX...
database is set to BULK_LOGGED before rows are inserted and reset to FULL after the INSERT INTO…SELECT statement. In addition, the TABLOCK hint is specified for the target table Sales.SalesHistory. This ensures that the statement uses minimal space in the transaction log and performs ...
PLSQL_闪回操作3_Fashback Transaction Query 2014-12-09 Created By BaoXinjian 一、摘要 Flashback Transaction Query也是使用UNDO信息来实现。 利用这个功能可以查看某个事务执行的所有变化,它需要访问flashback_transaction_query 视图,这个视图的XID列代表事务ID,利用这个ID可以区分特定事务发生的所有数据变化。
SqlCommand(String, SqlConnection, SqlTransaction) 使用查詢 SqlConnection、、和 SqlTransaction 的文字, SqlCommand 初始化 類別的新實例。 屬性 展開資料表 CommandText 取得或設定要在資料來源執行的 Transact-SQL 陳述式、資料表名稱或預存程序。 CommandTimeout 取得或設定結束執行命令的嘗試並產生...