完成大部分标的数据库迁移的安装工具；

database/migrations/20220419031527_system_config.php

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+<?php
+
+use think\migration\Migrator;
+use think\migration\db\Column;
+
+class SystemConfig extends Migrator
+{
+    /**
+     * Change Method.
+     *
+     * Write your reversible migrations using this method.
+     *
+     * More information on writing migrations is available here:
+     * http://docs.phinx.org/en/latest/migrations.html#the-abstractmigration-class
+     *
+     * The following commands can be used in this method and Phinx will
+     * automatically reverse them when rolling back:
+     *
+     *    createTable
+     *    renameTable
+     *    addColumn
+     *    renameColumn
+     *    addIndex
+     *    addForeignKey
+     *
+     * Remember to call "create()" or "update()" and NOT "save()" when working
+     * with the Table class.
+     */
+    public function change()
+    {
+        $table = $this->table('system_config')
+            ->setComment('系统配置表')
+            ->addColumn(Column::char('name', 30)->setDefault('')->setComment('变量名'))
+            ->addColumn(Column::char('group', 30)->setDefault('')->setComment('分组'))
+            ->addColumn(Column::text('value')->setComment('变量值'))
+            ->addColumn(Column::char('remark', 100)->setDefault('')->setComment('备注信息'))
+            ->addColumn(Column::integer('sort')->setDefault(0)->setComment('排序'))
+            ->addColumn(Column::integer('create_time')->setLimit(11)->setDefault(0))
+            ->addColumn(Column::integer('update_time')->setLimit(11)->setDefault(0))
+            ->addIndex('name')
+            ->addIndex('group')
+            ->create();
+    }
+}