[英]How to add column and description and column type to sql server using c#
我有一個帶有說明和類型的字段列表,需要將它們添加到表中。
例如。 SomeField / SomeDescription /十進制
我將如何使用descrption添加此列並使用c#將其鍵入到sql server 2012數據庫中? 我知道如何通過sql添加列,但是我需要能夠在c#中做到這一點
這是我想出的解決方案。
基本上,我使用sql添加了列(即Alter表等)。
然后,我調用了一個現有的sql存儲過程: sp_addextendedproperty
string[] allLines = File.ReadAllLines(@"C:\Table.csv");
var query = from line in allLines
let data = line.Split(',')
select new
{
FieldName = data[0],
Description = data[1]
};
try
{
string connection = "my connection string";
using (SqlConnection conn = new SqlConnection(connection))///add your connection string
{
SqlCommand command = new SqlCommand();
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
{
command.Connection = conn;
command.Transaction = trans;
foreach (var item in query)
{
String sql = string.Format("ALTER TABLE MyTable ADD {0} Decimal(18,6)", item.FieldName.ToString());
command.CommandText = sql;
command.ExecuteNonQuery();
}
trans.Commit();
}
conn.Close();
conn.Open();
SqlTransaction transaction = conn.BeginTransaction();
using (SqlCommand cmd = new SqlCommand("sp_addextendedproperty", conn, transaction))
{
cmd.CommandType = CommandType.StoredProcedure;
foreach (var item in query)
{
cmd.Parameters.Clear();
cmd.Parameters.Add("@name", SqlDbType.VarChar).Value = "MS_Description";
cmd.Parameters.Add("@value", SqlDbType.VarChar).Value = item.Description.ToString();
cmd.Parameters.Add("@level0type", SqlDbType.VarChar).Value = "SCHEMA";
cmd.Parameters.Add("@level0name", SqlDbType.VarChar).Value = "dbo";
cmd.Parameters.Add("@level1type", SqlDbType.VarChar).Value = "TABLE";
cmd.Parameters.Add("@level1name", SqlDbType.VarChar).Value = MyTable;
cmd.Parameters.Add("@level2type", SqlDbType.VarChar).Value = "COLUMN";
cmd.Parameters.Add("@level2name", SqlDbType.VarChar).Value = item.FieldName.ToString();
cmd.ExecuteNonQuery();
}
transaction.Commit();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
像這樣:
string connection = "your connection string";
try
{
using(SqlConnection conn = new SqlConnection(connection))///add your connection string
{
String sql="ALter Table MyTable add SomeField Decimal(18,3)";
conn.Open();
using( SqlCommand command = new SqlCommand(sql,conn))
{
command.ExecuteNonQuery();
}
}
}
catch (Ecxeption ex)
{
MessageBox.Show(ex.Message);
}
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