C#同步SQL Server数据库Schema

1. 先写个sql处理类：

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Text;

namespace PinkDatabaseSync
{
    class DBUtility : IDisposable
    {
        private string Server;
        private string Database;
        private string Uid;
        private string Password;
        private string connectionStr;
        private SqlConnection sqlConn;

        public void EnsureConnectionIsOpen()
        {
            if (sqlConn == null)
            {
                sqlConn = new SqlConnection(this.connectionStr);
                sqlConn.Open();
            }
            else if (sqlConn.State == ConnectionState.Closed)
            {
                sqlConn.Open();
            }
        }

        public DBUtility(string server, string database, string uid, string password)
        {
            this.Server = server;
            this.Database = database;
            this.Uid = uid;
            this.Password = password;
            this.connectionStr = "Server=" + this.Server + ";Database=" + this.Database + ";User Id=" + this.Uid + ";Password=" + this.Password;
        }

        public int ExecuteNonQueryForMultipleScripts(string sqlStr)
        {
            EnsureConnectionIsOpen();
            SqlCommand cmd = sqlConn.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = sqlStr;
            return cmd.ExecuteNonQuery();
        }
        public int ExecuteNonQuery(string sqlStr)
        {
            EnsureConnectionIsOpen();
            SqlCommand cmd = new SqlCommand(sqlStr, sqlConn);
            cmd.CommandType = CommandType.Text;
            return cmd.ExecuteNonQuery();
        }


        public object ExecuteScalar(string sqlStr)
        {
            EnsureConnectionIsOpen();
            SqlCommand cmd = new SqlCommand(sqlStr, sqlConn);
            cmd.CommandType = CommandType.Text;
            return cmd.ExecuteScalar();
        }

        public DataSet ExecuteDS(string sqlStr)
        {
            DataSet ds = new DataSet();
            EnsureConnectionIsOpen();
            SqlDataAdapter sda= new SqlDataAdapter(sqlStr,sqlConn);
            sda.Fill(ds);
            return ds;
        }

        public void Dispose()
        {
            if (sqlConn != null)
                sqlConn.Close();
        }
    }
}

2. 再写个数据库类型类：

using System;
using System.Collections.Generic;
using System.Text;

namespace PinkDatabaseSync
{
    public class SQLDBSystemType
    {
        public static Dictionary<string, string> systemTypeDict
        {
            get{
            var systemTypeDict = new Dictionary<string, string>();
            systemTypeDict.Add("34", "image");
            systemTypeDict.Add("35", "text");
            systemTypeDict.Add("36", "uniqueidentifier");
            systemTypeDict.Add("40", "date");
            systemTypeDict.Add("41", "time");
            systemTypeDict.Add("42", "datetime2");
            systemTypeDict.Add("43", "datetimeoffset");
            systemTypeDict.Add("48", "tinyint");
            systemTypeDict.Add("52", "smallint");
            systemTypeDict.Add("56", "int");
            systemTypeDict.Add("58", "smalldatetime");
            systemTypeDict.Add("59", "real");
            systemTypeDict.Add("60", "money");
            systemTypeDict.Add("61", "datetime");
            systemTypeDict.Add("62", "float");
            systemTypeDict.Add("98", "sql_variant");
            systemTypeDict.Add("99", "ntext");
            systemTypeDict.Add("104", "bit");
            systemTypeDict.Add("106", "decimal");
            systemTypeDict.Add("108", "numeric");
            systemTypeDict.Add("122", "smallmoney");
            systemTypeDict.Add("127", "bigint");
            systemTypeDict.Add("240-128", "hierarchyid");
            systemTypeDict.Add("240-129", "geometry");
            systemTypeDict.Add("240-130", "geography");
            systemTypeDict.Add("165", "varbinary");
            systemTypeDict.Add("167", "varchar");
            systemTypeDict.Add("173", "binary");
            systemTypeDict.Add("175", "char");
            systemTypeDict.Add("189", "timestamp");
            systemTypeDict.Add("231", "nvarchar");
            systemTypeDict.Add("239", "nchar");
            systemTypeDict.Add("241", "xml");
            systemTypeDict.Add("231-256", "sysname");
            return systemTypeDict;
            }
        }
    }
}

3. 写个同步数据库表结构schema：

public void SyncDBSchema(string server, string dbname, string uid, string password,
            string server2, string dbname2, string uid2, string password2)
        {
            DBUtility db = new DBUtility(server, dbname, uid, password);
            DataSet ds = db.ExecuteDS("SELECT sobjects.name FROM sysobjects sobjects WHERE sobjects.xtype = 'U'");
            DataRowCollection drc = ds.Tables[0].Rows;
            string test = string.Empty;
            string newLine = " ";
            foreach (DataRow dr in drc)
            {
                string tableName = dr[0].ToString();
                test += "if NOT exists (select * from sys.objects where name = '" + tableName + "' and type = 'u')";
                test += "CREATE TABLE [dbo].[" + tableName + "](" + newLine;
                DataSet ds2 = db.ExecuteDS("SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('dbo." + tableName + "')");
                DataRowCollection drc2 = ds2.Tables[0].Rows;
                foreach (DataRow dr2 in drc2)
                {
                    test += "[" + dr2["name"].ToString() + "] ";
                    string typeName = SQLDBSystemType.systemTypeDict[dr2["system_type_id"].ToString()];
                    test += "[" + typeName + "]";
                    string charLength = string.Empty;
                    if (typeName.Contains("char"))
                    {
                        charLength = (Convert.ToInt32(dr2["max_length"].ToString()) / 2).ToString();
                        test += "(" + charLength + ")" + newLine;
                    }
                    bool isIdentity = bool.Parse(dr2["is_identity"].ToString());
                    test += isIdentity ? " IDENTITY(1,1)" : string.Empty;
                    bool isNullAble = bool.Parse(dr2["is_nullable"].ToString());
                    test += (isNullAble ? " NULL," : " NOT NULL,") + newLine;
                }
                test += "CONSTRAINT [PK_" + tableName + "] PRIMARY KEY CLUSTERED ";
                string primaryKeyName = drc2[0]["name"].ToString();
                test += @"(
                    	[" + primaryKeyName + @"] ASC
                        )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
                        ) ON [PRIMARY]" + newLine;
            }

            test = "use [" + dbname2 + "]" + newLine + test;
            DBUtility db2 = new DBUtility(server2, dbname2, uid2, password2);
            db2.ExecuteNonQueryForMultipleScripts(test);
        }

4. 最后执行同步函数：

private void SyncDB_Click(object sender, EventArgs e)
        {
            string server = "localhost";
            string dbname = "testdb1";
            string uid = "sa";
            string password = "password1";
            string server2 = "servername2";
            string dbname2 = "testdb2";
            string uid2 = "sa";
            string password2 = "password2";
            try
            {
                SyncDBSchema(server, dbname, uid, password, server2, dbname2, uid2, password2);
                MessageBox.Show("Done sync db schema successfully!");
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }
        }

注： 这只是做个简单的DB schema同步，还可以很多地方可以继续完善，比如约束，双主键，外键等等。