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数据库中遇到的操作

• 查询字段是json的某个值

 $map['json_extract(goods, "$.brand_id")'] = (int)$params['brand_id']; //获取数据库中某个字段是json中得某个值，进行查询，goods是表中字段，brand_id是json中要查詢的字段。数据类型一定要对应要不然查询不出来。

• 查询结果进行遍历操作：

db('product_plant')->where($map)->order('id', 'desc')->paginate($limit)->each(function ($item, $key) use ($store_id) {//代码逻辑
｝

• 多级下拉

if (isset($params['cat']) && !empty($params['cat'])) {if (count($params['cat']) == 1) {$shop_cat_array = model('store_category')->where(['pid'=>$params['cat'][0], 'store_id'=>$this->auth->id])->column('id');$cat = model('store_category')->where('pid', 'in', $shop_cat_array)->where('store_id', $this->auth->id)->column('id');$map['shop_cat'] = ['in', $cat];}else if (count($params['cat']) == 2) {$cat = model('store_category')->where(['pid'=>$params['cat'][1], 'store_id'=>$this->auth->id])->column('id');$map['shop_cat'] = ['in', $cat];}else {$map['shop_cat'] = $params['cat'][2];}}

$field = ‘p.id’;
$sql=db{(}^{\prime }produc{t}^{\prime })->alias{(}^{\prime }{p}^{\prime })->field($field)->where($where)->union(function($query) use ($where,$field) {
$query->name{(}^{\prime }stor{e}_{p}roduc{t}^{\prime })->alias{(}^{\prime }{p}^{\prime })->field($field)->where($where);
}, true)->buildSql();
$model=Db::table($sql . ’ as a’);
$productIds = $model->column(‘id’);
$map[‘product_id’] = [‘in’, $productIds];

$this->request->domain()

 $bill_money = db('store_bill')->where(array_merge(['comein'=>1],$w))->sum('price')-db('store_bill')->where(array_merge(['comein'=>0],$w))->sum('price');

• 查看数据库中json字段不符合json结构的：

  SELECT *
  FROM hzqc_product_plant
  WHERE JSON_VALID(goods) = 0;

• 不符合json结构不能使用json_container()

• mysql相关函数：json_valid()

• php密码设置
  $params[‘salt’] = Random::alnum();
  $params{[}^{\prime }passwor{d}^{\prime }]=md5(md5($params[‘password’]) . $params[‘salt’]);

SELECT * FROM hzqc_product_plant WHERE store_id = 91000003 AND json_extract(goods, "$.bran{d}_{i}d")=6074SELECT\ast FROM‘hzq{c}_{p}roduc{t}_{p}lant‘WHERE‘stor{e}_{i}d‘=91000003ANDgoods-{>}^{\prime }$.“brand_id”’ = 6074;