您需要按照以下步骤使用laravel迁移在现有表中添加列.

You need to follow the following steps for adding a column in existing table using laravel migrations.

Laravel 3 +，4 +

1. 使用CLI进行迁移(使用特定名称以避免与现有模型冲突)

1. Make a migration using CLI as (Use a specific name to avoid ***ing with existing models)

php artisan migrate:make add_dob_users_table --table=users

Laravel 5 +

1. 使用CLI进行迁移(使用特定名称以避免与现有模型冲突)

1. Make a migration using CLI as (Use a specific name to avoid ***ing with existing models)

php artisan make:migration add_dob_to_users

Laravel 3 +

1. 使用Schema::table()方法(在访问现有表时，不创建新表)，并添加如下列:

1. Use the Schema::table() method (As you're accessing an existing table, not creating a new one) and add a column like this:

public function up()
{
    Schema::table('users', function($table) {
        $table->string('dob')->nullable()->change();
    });
}

public function down()
{
    Schema::table('users', function($table) {
        $table->dropColumn('dob');
    });
}

Laravel 4 +，5 +

1. 使用Schema::table()方法(在访问现有表时，不创建新表)，并添加如下列:

1. Use the Schema::table() method (As you're accessing an existing table, not creating a new one) and add a column like this:

public function up()
{
    Schema::table('users', function(Blueprint $table) {
        $table->string('dob')->nullable()->change();
    });
}

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

Laravel 3 +，4 +，5 +

1. 最终运行迁移为

1. Finally run your migrations as

php artisan migrate

用于创建和运行迁移的文档是

Docs for creating and running migrations are

Laravel 3 +

Laravel 3 Schema Builder

Laravel 3迁移

Laravel 4、5

Laravel模式生成器

Laravel迁移