为大家介绍sql server存储过程中if esle的用法,供大家学习参考。数据库中有两张表,A表主键为自动增长的并且是B表的外键且允许为空 现在要通过编程向B表中插入数据,可是在程序中是不允许给Int类型赋空值的如果不赋值就默认为0。 为了解决这个问题,用到了
为大家介绍sql server存储过程中if esle的用法,供大家学习参考。数据库中有两张表,A表主键为自动增长的并且是B表的外键且允许为空
现在要通过编程向B表中插入数据,,可是在程序中是不允许给Int类型赋空值的如果不赋值就默认为0。
为了解决这个问题,用到了存储过程的If Else,下面是完整的存储过程。
代码示例:
复制代码 代码如下:
create PROCEDURE [dbo].[P_Form_Control_Info_Add]
@TypeName varchar(20),
@Description varchar(50),
@CtlColSpan int,
@Sort int,
@SourceID int,
@FieldID int,
@TableID int
AS
if @SourceID = 0
begin
INSERT INTO T_Form_Control_Info (
[TypeName],
[Description],
[CtlColSpan],
[Sort],
[FieldID],
[TableID]
) VALUES (
@TypeName,
@Description,
@CtlColSpan,
@Sort,
@FieldID,
@TableID
)
end
else
begin
INSERT INTO T_Form_Control_Info (
[TypeName],
[Description],
[CtlColSpan],
[Sort],
[SourceID],
[FieldID],
[TableID]
) VALUES (
@TypeName,
@Description,
@CtlColSpan,
@Sort,
@SourceID,
@FieldID,
@TableID
)
end
return SCOPE_IDENTITY()

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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