C#同步SQL Server数据库中的数据

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 mySqlConn;

        public void EnsureConnectionIsOpen()
        {
            if (mySqlConn == null)
            {
                mySqlConn = new SqlConnection(this.connectionStr);
                mySqlConn.Open();
            }
            else if (mySqlConn.State == ConnectionState.Closed)
            {
                mySqlConn.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)
        {
            this.EnsureConnectionIsOpen();
            SqlCommand cmd = mySqlConn.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = sqlStr;
            return cmd.ExecuteNonQuery();
        }
        public int ExecuteNonQuery(string sqlStr)
        {
            this.EnsureConnectionIsOpen();
            SqlCommand cmd = new SqlCommand(sqlStr, mySqlConn);
            cmd.CommandType = CommandType.Text;
            return cmd.ExecuteNonQuery();
        }

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

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

        public void BulkCopyTo(string server, string database, string uid, string password, string tableName, string primaryKeyName)
        {
            string connectionString = "Server=" + server + ";Database=" + database + ";User Id=" + uid + ";Password=" + password;
            // Create destination connection
            SqlConnection destinationConnector = new SqlConnection(connectionString);

            SqlCommand cmd = new SqlCommand("SELECT * FROM " + tableName, destinationConnector);
            // Open source and destination connections.
            this.EnsureConnectionIsOpen();
            destinationConnector.Open();

            SqlDataReader readerSource = cmd.ExecuteReader();
            bool isSourceContainsData = false;
            string whereClause = " where ";
            while (readerSource.Read())
            {
                isSourceContainsData = true;
                whereClause += " " + primaryKeyName + "!=" + readerSource[primaryKeyName].ToString() + " and ";
            }
            whereClause = whereClause.Remove(whereClause.Length - " and ".Length, " and ".Length);
            readerSource.Close();

            whereClause = isSourceContainsData ? whereClause : string.Empty;

            // Select data from Products table
            cmd = new SqlCommand("SELECT * FROM " + tableName + whereClause, mySqlConn);
            // Execute reader
            SqlDataReader reader = cmd.ExecuteReader();
            // Create SqlBulkCopy
            SqlBulkCopy bulkData = new SqlBulkCopy(destinationConnector);
            // Set destination table name
            bulkData.DestinationTableName = tableName;
            // Write data
            bulkData.WriteToServer(reader);
            // Close objects
            bulkData.Close();
            destinationConnector.Close();
            mySqlConn.Close();
        }

        public void Dispose()
        {
            if (mySqlConn != null)
                mySqlConn.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. 写个同步数据库中的数据：

public void BulkCopyTo(string server, string database, string uid, string password, string tableName, string primaryKeyName)
        {
            string connectionString = "Server=" + server + ";Database=" + database + ";User Id=" + uid + ";Password=" + password;
            // Create destination connection
            SqlConnection destinationConnector = new SqlConnection(connectionString);

            SqlCommand cmd = new SqlCommand("SELECT * FROM " + tableName, destinationConnector);
            // Open source and destination connections.
            this.EnsureConnectionIsOpen();
            destinationConnector.Open();

            SqlDataReader readerSource = cmd.ExecuteReader();
            bool isSourceContainsData = false;
            string whereClause = " where ";
            while (readerSource.Read())
            {
                isSourceContainsData = true;
                whereClause += " " + primaryKeyName + "!=" + readerSource[primaryKeyName].ToString() + " and ";
            }
            whereClause = whereClause.Remove(whereClause.Length - " and ".Length, " and ".Length);
            readerSource.Close();

            whereClause = isSourceContainsData ? whereClause : string.Empty;

            // Select data from Products table
            cmd = new SqlCommand("SELECT * FROM " + tableName + whereClause, mySqlConn);
            // Execute reader
            SqlDataReader reader = cmd.ExecuteReader();
            // Create SqlBulkCopy
            SqlBulkCopy bulkData = new SqlBulkCopy(destinationConnector);
            // Set destination table name
            bulkData.DestinationTableName = tableName;
            // Write data
            bulkData.WriteToServer(reader);
            // Close objects
            bulkData.Close();
            destinationConnector.Close();
            mySqlConn.Close();
        }

4. 最后执行同步函数：

private void SyncDB_Click(object sender, EventArgs e)
        {
            string server = "localhost";
            string dbname = "pinkCRM";
            string uid = "sa";
            string password = "password";
            string server2 = "server2";
            string dbname2 = "pinkCRM2";
            string uid2 = "sa";
            string password2 = "password2";
            try
            {
                LogView.Text = "DB data is syncing!";
                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;
                foreach (DataRow dr in drc)
                {
                    string tableName = dr[0].ToString();
                    LogView.Text = LogView.Text + Environment.NewLine + " syncing table:" + tableName + Environment.NewLine;
                    DataSet ds2 = db.ExecuteDS("SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('dbo." + tableName + "')");
                    DataRowCollection drc2 = ds2.Tables[0].Rows;
                    string primaryKeyName = drc2[0]["name"].ToString();
                    db.BulkCopyTo(server2, dbname2, uid2, password2, tableName, primaryKeyName);

                    LogView.Text = LogView.Text +"Done sync data for table:"+ tableName+ Environment.NewLine;
                }
                MessageBox.Show("Done sync db data successfully!");
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }
        }

注： 这里只写了对已有数据的不再插入数据，可以再提高为如果有数据更新，可以进行更新，那么一个数据库同步工具就可以完成了！