ExecuteSqlCommand(DatabaseFacade, RawSqlString, IEnumerable<Object>) 已淘汰. 針對資料庫執行指定的 SQL,並傳回受影響的資料列數目。 請注意,這個方法不會啟動交易。 若要搭配交易使用這個方法,請先呼叫 BeginTransaction(DatabaseFacade, IsolationLevel) 或UseTransaction(DatabaseFacade, Db...
使用ExecuteSqlCommand()执行存储过程 ExecuteSqlCommand()方法用于以字符串形式执行数据库命令。对于受指定命令影响的行数,它返回一个整数。 var context = new SchoolContext(); var rowsAffected = context.Database.ExecuteSqlCommand("Update Students set FirstName = 'Bill' where StudentId = 1;"); 在上面的...
Database.ExecuteSqlInterpolated($"UPDATE dbo.MyTable SET SomeColumn = {newValue} WHERE Id = {id}"); } 这两个方法用于执行非查询操作,如 DML(数据操纵语言)语句或 DDL(数据定义语言)语句。它们不会返回实体,而是执行SQL语句并返回受影响的行数。 DbContext.Database.ExecuteSqlCommand 方法(返回受影响...
person.UserName="555-555-5555";//直接通过访问数据库来修改同一条数据 (这里是为了模拟并发) context.Database.ExecuteSqlCommand("UPDATEdbo.UserTableSETUserName='Jane'WHEREID=1"); try {//尝试保存修改inta=context.SaveChanges(); }//获取并发异常 catch (DbUpdateConcurrencyException ex) { foreach (var...
publicstaticclassFunctionDemoClass{publicstaticvoidDemoAverage(this EFCDbContext db){using(var transaction = db.Database.BeginTransaction()){try { db.Database.ExecuteSqlCommand("IF OBJECT ID ('dbo.DemoAverage',N'FN') IS NOT NULL DROP FUNCTION db0.DemoAverage"); db.Database.ExecuteSql...
{categoryID}");var result = query.ToList();} 注意：这⾥不是直接使⽤拼接的⽅式处理SQL，⽽是转化为参数化的SQL语句，这有助于防⽌SQL注⼊攻击。我们可以使⽤SQL Server Profiler帮我们验证：exec sp_executesql N'select * from Category where CategoryID=@p0 ',N'@p0 int',@p0=1 ...
Value = dt, SqlDbType = SqlDbType.Structured, TypeName = "dbo.HDS2_PrescriptionType" }; string sql = string.Format("dbo.HDS2_spInsertPrescriptionsFromExcel @{0}, @{1}", p1.ParameterName, p2.ParameterName); var db = new Db(); db.Database.ExecuteSqlCommand(sql, p1, p2); r...
命令: DbContext.Database.ExecuteSqlCommand(); 查询: DbSet.FromSql()https://docs.microsoft.com/en-us/ef/core/querying/raw-sql; 这个方法目前还有一些限制, 它只能返回实体的类型, 并且得返回domain model所有的属性, 而且属性的名字必须也得一一对应. SQL语句不可以包含关联的导航属性, 但是可以配合Include...
Database.ExecuteSqlCommand( "UPDATE user SET name={0}, age={1}, hobby={2} WHERE id={3}", user.Name, user.Age, user.Hobby, user.Id); } } //查询 public UserEntity QueryById(int id) { using (DbContext) { return DbContext.Users.FromSql("SELECT id,name,age,hobby FROM user ...
object[] paramItems = new object[] { new SqlParameter("@paramName", "Ben") }; int items = Db.Database.ExecuteSqlRaw("DELETE FROM Users WHERE [Name] = @paramName", paramItems); Before 3.1, there was ExecuteSqlCommand. FromSqlRaw<T> Selects data and maps to existing DbSet<TSource>...