标签：des c class blog tar a
原文:http://blog.csdn.net/tjvictor/article/details/4360030
在SQL Server
中插入一条数据使用Insert语句，但是如果想要批量插入一堆数据的话，循环使用Insert不仅效率低，而且会导致SQL一系统性能问题。下面介绍SQL
Server支持的两种批量数据插入方法：Bulk和表值参数(Table-Valued Parameters)。
运行下面的脚本，建立测试数据库和表值参数。
- --Create DataBase
- create database BulkTestDB;
- go
- use BulkTestDB;
- go
- --Create Table
- Create table BulkTestTable(
- Id int primary key,
- UserName nvarchar(32),
- Pwd varchar(16))
- go
- --Create Table Valued
- CREATE TYPE BulkUdt AS TABLE
- (Id int,
- UserName nvarchar(32),
- Pwd varchar(16))
下面我们使用最简单的Insert语句来插入100万条数据，代码如下：
- Stopwatch sw = new Stopwatch();
-
- SqlConnection sqlConn = new SqlConnection(
- ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString);
-
- SqlCommand sqlComm = new SqlCommand();
- sqlComm.CommandText = string.Format("insert into BulkTestTable(Id,UserName,Pwd)values(@p0,@p1,@p2)");
- sqlComm.Parameters.Add("@p0", SqlDbType.Int);
- sqlComm.Parameters.Add("@p1", SqlDbType.NVarChar);
- sqlComm.Parameters.Add("@p2", SqlDbType.VarChar);
- sqlComm.CommandType = CommandType.Text;
- sqlComm.Connection = sqlConn;
- sqlConn.Open();
- try
- {
-
- for (int multiply = 0; multiply < 10; multiply++)
- {
- for (int count = multiply * 100000; count < (multiply + 1) * 100000; count++)
- {
-
- sqlComm.Parameters["@p0"].Value = count;
- sqlComm.Parameters["@p1"].Value = string.Format("User-{0}", count * multiply);
- sqlComm.Parameters["@p2"].Value = string.Format("Pwd-{0}", count * multiply);
- sw.Start();
- sqlComm.ExecuteNonQuery();
- sw.Stop();
- }
-
- Console.WriteLine(string.Format("Elapsed Time is {0} Milliseconds", sw.ElapsedMilliseconds));
- }
- }
- catch (Exception ex)
- {
- throw ex;
- }
- finally
- {
- sqlConn.Close();
- }
-
- Console.ReadLine();
耗时图如下：
由于运行过慢，才插入10万条就耗时72390 milliseconds，所以我就手动强行停止了。
下面看一下使用Bulk插入的情况：
bulk方法主要思想是通过在客户端把数据都缓存在Table中，然后利用SqlBulkCopy一次性把Table中的数据插入到数据库
代码如下：
- public static void BulkToDB(DataTable dt)
- {
- SqlConnection sqlConn = new SqlConnection(
- ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString);
- SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConn);
- bulkCopy.DestinationTableName = "BulkTestTable";
- bulkCopy.BatchSize = dt.Rows.Count;
-
- try
- {
- sqlConn.Open();
- if (dt != null && dt.Rows.Count != 0)
- bulkCopy.WriteToServer(dt);
- }
- catch (Exception ex)
- {
- throw ex;
- }
- finally
- {
- sqlConn.Close();
- if (bulkCopy != null)
- bulkCopy.Close();
- }
- }
-
- public static DataTable GetTableSchema()
- {
- DataTable dt = new DataTable();
- dt.Columns.AddRange(new DataColumn[]{
- new DataColumn("Id",typeof(int)),
- new DataColumn("UserName",typeof(string)),
- new DataColumn("Pwd",typeof(string))});
-
- return dt;
- }
-
- static void Main(string[] args)
- {
- Stopwatch sw = new Stopwatch();
- for (int multiply = 0; multiply < 10; multiply++)
- {
- DataTable dt = Bulk.GetTableSchema();
- for (int count = multiply * 100000; count < (multiply + 1) * 100000; count++)
- {
- DataRow r = dt.NewRow();
- r[0] = count;
- r[1] = string.Format("User-{0}", count * multiply);
- r[2] = string.Format("Pwd-{0}", count * multiply);
- dt.Rows.Add(r);
- }
- sw.Start();
- Bulk.BulkToDB(dt);
- sw.Stop();
- Console.WriteLine(string.Format("Elapsed Time is {0} Milliseconds", sw.ElapsedMilliseconds));
- }
-
- Console.ReadLine();
- }
耗时图如下：
可见，使用Bulk后，效率和性能明显上升。使用Insert插入10万数据耗时72390，而现在使用Bulk插入100万数据才耗时17583。
最后再看看使用表值参数的效率，会另你大为惊讶的。
表值参数是SQL Server 2008新特性，简称TVPs。对于表值参数不熟悉的朋友，可以参考最新的book
online，我也会另外写一篇关于表值参数的博客，不过此次不对表值参数的概念做过多的介绍。言归正传，看代码：
- public static void TableValuedToDB(DataTable dt)
- {
- SqlConnection sqlConn = new SqlConnection(
- ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString);
- const string TSqlStatement =
- "insert into BulkTestTable (Id,UserName,Pwd)" +
- " SELECT nc.Id, nc.UserName,nc.Pwd" +
- " FROM @NewBulkTestTvp AS nc";
- SqlCommand cmd = new SqlCommand(TSqlStatement, sqlConn);
- SqlParameter catParam = cmd.Parameters.AddWithValue("@NewBulkTestTvp", dt);
- catParam.SqlDbType = SqlDbType.Structured;
-
- catParam.TypeName = "dbo.BulkUdt";
- try
- {
- sqlConn.Open();
- if (dt != null && dt.Rows.Count != 0)
- {
- cmd.ExecuteNonQuery();
- }
- }
- catch (Exception ex)
- {
- throw ex;
- }
- finally
- {
- sqlConn.Close();
- }
- }
-
- public static DataTable GetTableSchema()
- {
- DataTable dt = new DataTable();
- dt.Columns.AddRange(new DataColumn[]{
- new DataColumn("Id",typeof(int)),
- new DataColumn("UserName",typeof(string)),
- new DataColumn("Pwd",typeof(string))});
-
- return dt;
- }
-
- static void Main(string[] args)
- {
- Stopwatch sw = new Stopwatch();
- for (int multiply = 0; multiply < 10; multiply++)
- {
- DataTable dt = TableValued.GetTableSchema();
- for (int count = multiply * 100000; count < (multiply + 1) * 100000; count++)
- {
- DataRow r = dt.NewRow();
- r[0] = count;
- r[1] = string.Format("User-{0}", count * multiply);
- r[2] = string.Format("Pwd-{0}", count * multiply);
- dt.Rows.Add(r);
- }
- sw.Start();
- TableValued.TableValuedToDB(dt);
- sw.Stop();
- Console.WriteLine(string.Format("Elapsed Time is {0} Milliseconds", sw.ElapsedMilliseconds));
- }
-
- Console.ReadLine();
- }
耗时图如下：
比Bulk还快5秒。
SQL Server 批量插入数据的两种方法,布布扣,bubuko.com
SQL Server 批量插入数据的两种方法
标签：des c class blog tar a
原文地址：http://www.cnblogs.com/erictanghu/p/3761032.html
