更新表 SQL 查询：SqlConnection

Posted 2023-04-12

【中文标题】更新表 SQL 查询：SqlConnection

【英文标题】：Update Table SQL Query: SqlConnection

【发布时间】：2020-08-04 11:30:36

【问题描述】：

我想根据 Id 参数更新记录，我尝试了以下步骤，但这似乎不正确，因为它会产生编译错误：

public async Task CustomerUpdateAsync(string customerId)

  await using var sqlConnection = new SqlConnection(_connectionString);
            
                var sqlQuery = "UPDATE Customer(CustomerId,Name,Address,PostalCode,City)" +
                          "SET (@CustomerId,@Name,@Address,@PostalCode,@City)" +
                          $"WHERE CustomerId=@CustomerId", new CustomerId = customerId;

                await sqlConnection.ExecuteAsync(sqlQuery, customerId);
            

错误：

只有赋值调用递增递减等待和新对象表达式可以作为语句使用

【问题讨论】：

请用您正在使用的数据库标记您的问题：mysql、sql-server、oracle...？

【参考方案1】：

你追求的是这样的：

await sqlConnection.ExecuteAsync(@"
UPDATE Customer
SET    Name = @name, Address = @address,
       PostalCode = @postalCode, City = @city
WHERE  CustomerId=@customerId",
     new  customerId, name, address, postalCode, city );

但是，我不知道您打算从哪里获得 name、address 等 - 它们没有显示在问题中。

【参考方案2】：

谢谢大家，我稍微调整一下就解决了：-

 public async Task CustomerUpdateAsync(Customer customer)
            
                await using var sqlConnection = new SqlConnection(_connectionString);
                
                    var sql = "UPDATE Customer SET Name=@Name,Address=@Address, PostalCode=@PostalCode," +
                              "City=@City WHERE CustomerId=@CustomerId";
                    await sqlConnection.ExecuteAsync(sql, new
                    
                       CustomerId = customer.CustomerId,
                       Name = customer.Name,
                       Address = customer.Address,
                       PostalCode = customer.PostalCode,
                       City = customer.City
                    );