where()方法进行比较查询。，``php，$data = Db::name('table_name')>where('column_name', '=', 'value')>select();，`，这将生成一个SQL查询，用于从名为table_name的表中选择所有满足column_name等于value`的记录。$model>relation('关联字段', '关联模型')>select();where 方法链式调用即可实现。M 方法来查询数据条数。，，``php，$count = M('table_name')>count();，``Powered By Z-BlogPHP 1.7.3
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