EntityFramework 学习 一 Execute Native SQL Query

SQL query for entity types:

using (var ctx = new SchoolDBEntities())
{
    var studentList = ctx.Students.SqlQuery("Select * from Student").ToList<Student>();
  
}
     

注意：查询的字段必须和实体中的属性名对应

SQL query for non-entity types:

using (var ctx = new SchoolDBEntities())
{
    //Get student name of string type
    string studentName = ctx.Database.SqlQuery<string>("Select studentname 
        from Student where studentid=1").FirstOrDefault<string>();
}

Raw SQL commands to the database:

using (var ctx = new SchoolDBEntities())
{

    //Update command
    int noOfRowUpdated = ctx.Database.ExecuteSqlCommand("Update student 
            set studentname ='changed student by command' where studentid=1");
    //Insert command
    int noOfRowInserted = ctx.Database.ExecuteSqlCommand("insert into student(studentname) 
            values('New Student')");
    //Delete command
    int noOfRowDeleted = ctx.Database.ExecuteSqlCommand("delete from student 
            where studentid=1");

}