• Detailed explanation of DB first mode of Entity Framework


    EF (abbreviation of Entity Framework, the same below) has three ways: database first, model first and code first. Here’s how DB first works: 1. There are two tables in the database, one is the specialty table and the other is the student table. A student can only belong to one specialty Where t_ Major is […]

  • [regular expression series] zero width assertion


    preface In regular expressions, there is a barrier that cannot be bypassed, that isZero width assertion Zero width assertionIt is a zero width match, and its matching content will not be saved in the matching results, and will not occupyindexWidth, the final match results in only one position In short, it is used to find […]