php - 检查 Laravel 迁移文件中是否存在列

Question

我已经有了一个表名table_one.现在我想再添加两列。到目前为止一切正常。但是在我的方法中，我想检查表中是否存在列，例如dropIfExists('table').

/**
 * Run the migrations.
 *
 * @return void
 */
public function up()
{
    Schema::table('table_one', function (Blueprint $table) {
        $table->string('column_one')->nullable();
        $table->string('column_two')->nullable();
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::table('table_one', function (Blueprint $table) {
        // in here i want to check column_one and column_two exists or not
        $table->dropColumn('column_one');
        $table->dropColumn('column_two');
    });
}

标签： phpsqllaravel

Answer 1

你需要这样的东西

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