Host variables

最新推荐文章于 2022-03-13 16:46:17 发布

转载最新推荐文章于 2022-03-13 16:46:17 发布 · 268 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/ECNB/p/4611292.html

文章标签：

#数据库

本文介绍在C语言程序中如何使用宿主变量来实现SQL语句与程序之间的数据传递。宿主变量作为连接SQL与C语言的桥梁，在进行数据库操作时扮演着重要角色。输入型宿主变量用于从C程序向数据库发送数据，而输出型宿主变量则负责从数据库接收数据并传回给C程序。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Host variables are data items declared in a host application program and used in both host language statements and embedded SQL statements. They provide communication between SQL statements and the host language statements . An input host variable transfers data from a host language program to an SQL/MX database, and an output host variable transfers data from a database to the program. A host variable is a C variable with a data type that corresponds to an SQL data type.

You use host variables to provide communication between C and SQL statements and to receive data from a database or to insert data into a database. When you specify a host variable in an SQL statement, precede the host variable name with a colon (:). In C statements, you do not need the colon, as shown:
EXEC SQL SELECT column1 INTO :host_variable1 FROM =table
WHERE column1 > :host_variable2;
strcpy(new_name, host_variable1);

来自为知笔记(Wiz)

转载于:https://www.cnblogs.com/ECNB/p/4611292.html