SQL相关增删改查语句

Sql Server中

1,增加数据:

insert into MessageList (Name,Emails,Contents) values ('王海鹏','tcnf2008@hotmail.com','dd')

                表名(列)   values (数据项);

  

代码
// 在数据表里创建一个新行,并把当前属性的值插入对应的列中
public int Create()
{
//建立数据库连接
SqlConnection connection = new SqlConnection(_Connectionstring);
connection.open();
//打开数据库连接
//建立数据库连接对象
SqlCommand command = new SqlCommand("insert into Customers "
+"(LastName,FirstName,Address,City,State,Zip,Phone,"
+"SignUpDate) values (@LastName,@FirstName,@Address,"
+"@City,@Zip,@Phone,@SignUpDate)",connection);

//将要插入的数据加入数据库中
command.Parameters.AddWithValue("@LastName",_LastName);
command.Parameters.AddWithValue(
"@FirstName",_FirstName);
command.Parameters.AddWithValue(
"@Address",_Address);
command.Parameters.AddWithValue(
"@City",_City);
command.Parameters.AddWithValue(
"@Zip",_Zip);
command.Parameters.AddWithValue(
"@Phone",_Phone);
command.Parameters.AddWithValue(
"@SingUpDate",_SingUpDate);

command.ExecuteNonQuery();
//执行连接语句
command.Parameters.Clear();
command.CommandText
= "select @@IDENTITY"; //查找主键
int newCustomerID = Convert.ToInt32(command.ExecuteScalar());
connection.Close();
//关闭连接
_CustomerID = newCustomerID;
return newCustomerID;
}

2,删除数据:

3,修改数据:

4,查询语句:

  select * from user where ulname like '%ad%'

  SECLET * FROM 图书表 WHERE 作者 LIKE '%

5,执行SQL语句:

sqlcmd.connection.open();

sqlcmd.ExecuteNonQuery();

原文地址:https://www.cnblogs.com/netact/p/1773403.html