What is the principle of dynamic SQL execution?

2 years ago
Liam
1 minute

Dynamic SQL works by dynamically generating SQL statements based on conditions at runtime, and then sending the generated SQL statements to the database for execution.

The execution process of dynamic SQL generally includes the following steps:

  1. Receive parameters: Accept parameters based on user input or system conditions and process them.
  2. Build SQL statements: Generate SQL statements dynamically based on the received parameters. Different SQL statements can be constructed using conditional statements, loop statements, etc.
  3. Execute SQL statement: Sending the generated SQL statement to the database for execution. The database will parse the SQL statement and perform the corresponding operations, such as querying, inserting, updating, etc.
  4. Outcome: Obtain the results of the database execution and handle them accordingly. The results can be sent back to the user or further operations can be carried out.

The execution principle of dynamic SQL mainly relies on the characteristics of the programming language and the database driver. Programming languages typically provide APIs or frameworks to support the construction and execution of dynamic SQL. The database driver is responsible for sending the generated SQL statement to the database for execution and returning the results.

bannerAds