C# 更新SQL Server数据库备注信息从另一数据库

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Diagnostics;

namespace SyncDatabaseColumnDescription
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var ssb = new SqlConnectionStringBuilder();
            ssb.DataSource = @".\SQL2008";
            ssb.UserID = "sa";
            ssb.Password = "firstelite";
            ssb.InitialCatalog = "OMSDB";
            using (var connection = new SqlConnection(ssb.ConnectionString))
            {
                connection.Open();
                var tableList = GetTableList(connection);


                    foreach (var table in tableList)
                    {

                        var fieldList = GetFieldList(connection, table);
                        foreach (var field in fieldList)
                        {
                            var desc = GetFieldDescription(connection, table, field);
                            if (desc != null)
                                Debug.Print(table + " -> " + field + ":" + desc);
                        }
                    }
            }
        }

        private void UpdateFieldDescription()
        {
            var ssb = new SqlConnectionStringBuilder();
            ssb.DataSource = @".\SQL2008";
            ssb.UserID = "**";
            ssb.Password = "****";
            ssb.InitialCatalog = "OMSDB_WITH_MEMO";
            using (var connection = new SqlConnection(ssb.ConnectionString))
            {
                connection.Open();
                var tableList = GetTableList(connection);

                ssb.InitialCatalog = "OMSDB";
                using (var connection2 = new SqlConnection(ssb.ConnectionString))
                {
                    connection2.Open();

                    var tableList2 = GetTableList(connection2);

                    foreach (var table in tableList)
                    {
                        if (!tableList2.Any(t => t == table))
                            continue;

                        var fieldList = GetFieldList(connection, table);
                        var fieldList2 = GetFieldList(connection2, table);

                        foreach (var field in fieldList)
                        {
                            if (!fieldList2.Any(f => f == field))
                                continue;

                            var desc = GetFieldDescription(connection, table, field);
                            if (string.IsNullOrWhiteSpace(desc))
                                continue;

                            var desc2 = GetFieldDescription(connection2, table, field);
                            if (desc2 != null)
                                UpdateFieldDescription(connection2, table, field, desc);
                            else
                                AddFieldDescription(connection2, table, field, desc);
                        }
                    }

                }
            }
        }

        private List<string> GetTableList(SqlConnection connection)
        {
            var tableList = new List<string>();
            using (var cmd = new SqlCommand(@"
                        SELECT TABLE_NAME 
                        FROM INFORMATION_SCHEMA.TABLES 
                        WHERE TABLE_TYPE = 'BASE TABLE' 
                        ORDER BY TABLE_NAME", connection))
            {
                using (var reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        tableList.Add(reader[0].ToString());
                    }
                }
            }
            return tableList;
        }

        private List<string> GetFieldList(SqlConnection connection, string tableName)
        {
            var fieldList = new List<string>();
            using (var cmd = new SqlCommand("SELECT * FROM [" + tableName + "] WHERE 1=2", connection))
            {
                using (var reader = cmd.ExecuteReader())
                {
                    for (var i = 0; i < reader.FieldCount; i++)
                        fieldList.Add(reader.GetName(i));
                }
            }
            return fieldList;
        }

        private string GetFieldDescription(SqlConnection connection, string tableName, string fieldName)
        {
            using (var cmd = new SqlCommand(@"SELECT g.[value]
                                            FROM    dbo.syscolumns A
                                                    INNER JOIN dbo.sysobjects D 
                                                        ON A.id = D.id
                                                            AND D.xtype = 'U'
                                                            AND D.name <> 'dtproperties'
                                                    INNER JOIN sys.extended_properties G 
                                                        ON A.id = G.major_id
                                                           AND A.colid = G.minor_id
                                            WHERE   D.name = '" + tableName + @"'
                                                AND A.name='" + fieldName + @"'", connection))
            {
                var ret = cmd.ExecuteScalar();
                if (ret == null)
                    return null;
                return ret.ToString();
            }
        }

        private bool AddFieldDescription(SqlConnection connection, string tableName, string filedName, string description)
        {
            using (var cmd = new SqlCommand(@"EXECUTE   sp_addextendedproperty   N'MS_Description',   '" + description.Replace("'","''")
                + "',   N'user',   N'dbo',   N'table',   N'" + tableName + "',   N'column',   N'" + filedName + "' ", connection))
            {
                return cmd.ExecuteNonQuery() > 0;
            }
        }

        private bool UpdateFieldDescription(SqlConnection connection, string tableName, string filedName, string description)
        {
            using (var cmd = new SqlCommand(@"EXECUTE   sp_updateextendedproperty   N'MS_Description',   '" + description.Replace("'", "''")
                + "',   N'user',   N'dbo',   N'table',   N'" + tableName + "',   N'column',   N'" + filedName + "' ", connection))
            {
                return cmd.ExecuteNonQuery() > 0;
            }
        }
    }
}