Question

我有一个team_members表，它具有以下结构，其中只有project_request_id被更新。我创建了具有相同数据结构的log_team_members，所以每当更新team_members时，我都会丢失旧数据（我需要读取这些数据），这就是为什么我想创建一个trigger的{{1}}，它将整个before updating team_members project_request_id保存到此表中。

您能帮我从Latavel迁移中构建触发器吗？

old row

team_members更新发生的位置：

public function up()
{
    Schema::create('team_members', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        $table->string('title');
        $table->string('picture');
        $table->string('email')->unique();
        $table->string('phone_number');
        $table->text('background_information')->nullable();
        $table->timestamps();
        $table->integer('project_request_id')->unsigned();
        $table->foreign('project_request_id')->references('id')->on('project_requests')->onDelete('cascade');
    });
}

public function up()
{
    Schema::create('team_members', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name');
        $table->string('title');
        $table->string('picture');
        $table->string('email')->unique();
        $table->string('phone_number');
        $table->text('background_information')->nullable();
        $table->timestamps();
        $table->integer('project_request_id')->unsigned();
        $table->foreign('project_request_id')->references('id')->on('project_requests')->onDelete('cascade');
    });
}

Answer 1

// use DB; 
$data = UpdateModelName::find(1);
$copy = $data->replicate()->toArray();
// store data in new table
$newTable = new NewTableModel;
$newTable->insert($copy);

如何创建触发器，以便在更新表中的列之前将整个旧行保存到新表中？

1 个答案: