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)。
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();
}
2024-08-23 广告
http://zhidao.baidu.com/question/339410943.html
如果是100000条这样的大数据量可以每次批量更新3000条,这样数据库是可以承受的。
再给你一个批量3000的代码如下:
Map map = null;
String data1= "";
String data2 = "";
String sql = insert into biao values(?,?);
PreparedStatement preStmt = conn.prepareStatement(sql);
for(i = 0;i<dataList.size();i++){
map = dataList.get(i);
data1=map.get("data1");
data2 = map.get("data2");
preStmt.setString(1,data1);
preStmt.setString(2, data2);
preStmt.addBatch();
if(i%3000==0){
preStmt.executeBatch();
preStmt.clearBatch();
}
}