以前用command方法执行存储过程增加参数时,总是先用cmd.Parameters.Add方法来设置参数和参数类型,再用Parameters[0].Value来给参数赋值。以前的一个动作代码示例:
string strConn = "Data Source=.;Initial Catalog=HISDB;Integrated Security=True";
using( SqlConnection conn = new SqlConnection(strConn))
{
conn.Open();
SqlCommand cmd = new SqlCommand("AuditMessageInsert", conn);
//设置命令类型为存储过程,没有设置的话会执行失败
cmd.CommandType = CommandType.StoredProcedure;
//设置参数名和类型
cmd.Parameters.Add("@Target", SqlDbType.NChar);
cmd.Parameters.Add("@Description", SqlDbType.NChar);
cmd.Parameters.Add("@Actor", SqlDbType.NChar);
cmd.Parameters.Add("@Time", SqlDbType.DateTime);
cmd.Parameters.Add("@Computer", SqlDbType.NChar);
//给参数赋值
cmd.Parameters[0].Value = "ATarget";
cmd.Parameters[1].Value = "Description";
cmd.Parameters[2].Value = "Actor";
cmd.Parameters[3].Value = DateTime.Now;
cmd.Parameters[4].Value = "PC-Computer";
cmd.ExecuteNonQuery();
}
如果用Parameters.AddWithValue方法就不用这么麻烦了,可以直接加参数名和其值,不用再设置参数的类型,示例代码:
string strConn = "Data Source=.;Initial Catalog=HISDB;Integrated Security=True";
using( SqlConnection conn = new SqlConnection(strConn))
{
conn.Open();
SqlCommand cmd = new SqlCommand("AuditMessageInsert", conn);
cmd.CommandType = CommandType.StoredProcedure;
//增加参数:名称与类型 且与表中参数的顺序没关系
cmd.Parameters.AddWithValue("@Actor", "Actor");
cmd.Parameters.AddWithValue("@Target", "Target");
cmd.Parameters.AddWithValue("@Description", "Description");
cmd.Parameters.AddWithValue("@Computer", "Computer");
cmd.Parameters.AddWithValue("@Time", DateTime.Now);
cmd.ExecuteNonQuery();
}