Execute a SELECT statement and process the result set. In this tutorial, you have learned how to control the execution flow of the statements. To query data in SQLite database from a Node.js application, you use these steps: Open a database connection. Notice that the statements execute in parallel, therefore, each time you run the program, the order of execution may be different. I would like to simply return these values. ![]() for instance I would like to get column names in one function and the row count in another. The sum of 2 and 2 is 4 Code language: JavaScript ( javascript )Īs you see in the output, the order of execution is not the same as it was called in the program. I have written some basic functions that I would like to be performed synchronously rather then with async. It’s safe to nest the serialize() method as follows: db.serialize( () => `) Other statements will wait in a queue until all the previous statements are executed.Īfter the serialize() method returns, the execution mode is set to the original mode again. It means that only one statement can execute at a time. The serialize() method puts the execution mode into serialized mode. Portions of this page are modifications based on work. Node.js can be used very well with relational databases and SQLite is no exception. ![]() Executing statement in serialized mode with rialize Returns true if the current thread has a transaction pending. Let’s look into each method in detail to understand how it works. In this section, you will learn how to interact with SQLite databases from a Node.js application using the sqlite3 module. The serialize() method allows you to execute statements in serialized mode, while the parallelize() method executes the statements in parallel. The sqlite3 module provides you with two methods for controlling the execution flow of statements. Summary: in this tutorial, you will learn how to control the execution flow of statements.
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