Node Js Php Serialize Data
A Node.js framework agnostic library for serializing your data to JSON API. Canon Led Indirect Exposure Driver. If your data contains one or multiple objects of. Home / SQLite Node.js / Controlling the Execution Flow of Statements Summary: in this tutorial, you will learn how to control the execution flow of statements. The sqlite3 module provides you with two methods for controlling the execution flow of statements.
Each command inside the serialize() function is guaranteed to finish executing before the next one starts. In your example, the CREATE TABLE will finish before the INSERT gets run. Epson Lq 2500 Windows 7 Driver. If you didn't use serialize() then the CREATE TABLE and INSERT statements would be run in parallel. They would start so quickly one after the other that the INSERT may actually finish before the table has been created, giving you an error about trying to insert data into a table that doesn't exist. This is called a race condition, because every time you run your program you might get a different winner.
If CREATE TABLE wins the race then the program will work fine. But if INSERT wins the race, the program will break with an error. Since you can't control who wins the race, serialize() will stop INSERT from even starting until CREATE TABLE has reached the end, ensuring you get the same outcome every time. In your second example with only one statement then serialize() is still required. This is because run() starts the SQL query but returns immediately, leaving the query to run in the background. Since your very next command is one to close() the database, you'll cut it off while the query is still running. Since serialize() doesn't return until the last of its internal queries has completed, using it will hold off the close() until the query has completed.