id n

Determine if the database exists if exists (SELECT * from dbo.sysobjects WHERE name = ' database name ')--drop database [DB name]Determine if the table exists if exists (SELECT * from dbo.sysobjects WHERE id = object_id (n ' [table name] ') and

First, use statement instead of PreparedStatement objectThe optimization of the JDBC driver is based on what features are used. Choosing PreparedStatement or statement depends on how you want to use them. It is best to select statement for SQL

The following objects are judged for existence: Database, table, proc, trigger, temp table, index.1. Judge the database:if exists (SELECT * from sys.databases WHERE name = ' database name ')drop database [DB name]2. Judgment table:SQL codeif exists (

1 determine if the database exists if exists (SELECT * from sys.databases WHERE name = ' database name ') drop database [DB name]2 Determine if the table exists if exists (SELECT * from sysobjects where id = object_id (n ' [table name] ') and

The process created:#include #include#include#includeintMain () {intPid=fork ();//Create Child process if(pid==0) {printf ("d:%d\t%d\n", Getppid (), Getpid ());return 0;//Child process End } intPid2=fork ();//Create Child process

1 determining whether a database existsif exists (SELECT * from sys.databases WHERE name = ' database name ')drop database [DB name]2 Determining whether a table existsif exists (select * from sysobjects where id = object_id (n ' [table name] ') and

The following 4 main commands are found under Linux: Which, Whereis, locate, and find.(1) which [-a] cmdname1 cmdname2 ...Command parameters:-n Specifies the length of the file name, which must be greater than or equal to the longest file name in

In a distributed system, if a business can be processed by multiple identical nodes, it is easy to think of hashing the business request to these nodes, and if there are N nodes, the calculation method is: HASH (ID)% N.This is a simple and effective

Recently, I used Mybatis to add oracle databases in batches. The methods I found online at the beginning were to update mySQL. I tried it and found it was not suitable for Oracle, later, we found that the correct SQL statement added in batch in

Mysqld Program-directory and file Basedir = path uses the given directory as the root directory (installation directory ). Character-sets-dir = path indicates the directory where the character set is stored. Datadir = path reads database files from

Package entity;Persistence classImport javax.persistence.Entity;Import Javax.persistence.GeneratedValue;Import Javax.persistence.GenerationType;Import Javax.persistence.Id;Import javax.persistence.Table; //hql query book information @Entity @Table

In fact, this part, in general, mainly write Dbopenhelper class and Persondao class can ....The dbopenhelper mainly encapsulates the creation of the database, the creation and modification of the table. While Persondao mainly encapsulates DAO

Database query name: SelectName from Master. DBO. sysdatabasesWhere status<> 512 Query table (tables) Name: SelectName from DBO. sysobjectsWhere objectproperty (ID, n'isusertable ')= 1 andName <> 'dtproperties' Query the name of a data table with

  1. Use statement instead of preparedstatement objectThe JDBC driver is optimized based on what features are used. choosing preparedstatement or statement depends on how you use them. it is best to select statement for SQL statements that only run

Address: http://www.cnblogs.com/qq731109249/archive/2012/10/23/2736278.html In the actual development process, if the number of records is very large, it would be terrible to query and fill the data table with SQL statements directly. In addition,

  1. Determine whether the database existsIf exists (select * From SYS. databases where name = 'database name ')Drop database [database name] 2. Check whether the table exists.If exists (select * From sysobjects where id = object_id (n '[Table

SQL Server Stored Procedure/function encryption/Decryption Encryption of stored procedures and stored functions: With Encryption Create procedure DBO. sp_xml_main @ Table_name nvarchar (260) = '', @ Dirname nvarchar (20) ='' With Encryption As Begin

It is very easy to import data from the DBASE file to the SQL database. Use the following statement directly: /* ===================================================== ===================================== */-- If the table to be imported already

There are some methods for passing functions in various languages: function pointers can be used in C language, and function references, imitation functions, and Lambda are available in C ++, and Selector is also available in objective-C) and

Add a batch clearing method [* SQL2000 only]; For the usage and structure of sp_msforeach_worker, see http://blog.csdn.net/abandonship/archive/2008/06/06/2515884.aspx. Declare @ fieldtype sysnameSet @ fieldtype = 'varchar' -- DeleteDeclare hcforeach