@ [16] laravel database migration

Copyright: Kaka from https://blog.csdn.net/fangkang7 https://blog.csdn.net/fangkang7/article/details/90693499

author: Kaka

wechat: fangkangfk

The so-called migration like version control database, this mechanism allows the team to easily edit and share simple database table structure applications. Laravel migration usually junctions of the schema constructs can be readily applied to build the database table structure. If you've ever told team members frequently need to manually add columns to the local database table structure to maintain local development environment, then this is the database migration is committed to solve the problem.

 

In this written document it is not very clear, because only said how to create a data structure, only to modify the method of the column, but did not mention how to modify, then these processes take a look at the following, more still need to study the documents

 

Create a migration file: php artisan make: migration create_user_table.php

Use the command: php artisan migtate for database migration 

The wrong solution:

 

And then execute on ok

 

 

Open the database:

 

 

 

This is the first unified database structure, but in our normal project development project structure will change frequently, this time we can not directly change the direct line, but we also need to maintain a unified database, we can use the data laravel migration to operate

 

Before you modify a column, make sure that has to  doctrine/dbal depend added to the  composer.json current state of the file, Doctrine DBAL library used to determine the columns and columns to create the required adjustments specified SQL statement:

 composer require doctrine/dbal

 

For example, we have this database users to add a field myIsAdd this field

We need to create a migration file

 

 

Then use php artisan migrate command

 

 Database, has been added successfully

 

Here on the method of operation of the column I briefly listed, just know that this is to modify the structure of the table, the other can see document solutions (such as adding the index of the column, type)

 

This is to rename the field

Schema::table('users', function (Blueprint $table) {
    $table->renameColumn('from', 'to');
});

This is to remove the field

Schema::table('users', function (Blueprint $table) {
    $table->dropColumn('votes');
});

 

There are other special needs can check documents to solve their own, not to list here come