方式三：INSERT INTO xx select...
INSERT INTO Product(Id,Name,Price)
SELECT NEWID(),'牛栏1段',160
UNION ALL
SELECT NEWID(),'牛栏2段',180
UNION ALL
......
方式四：拼接SQL
INSERT INTO Product(Id,Name,Price) VALUES
(newid(),'牛栏1段',160)
,(newid(),'牛栏2段',260)
......
在C#中通过ADO.NET来实现批量操作存在四种与之对应的方式。
方式一：逐条插入
#region 方式一
static void InsertOne()
{
Console.WriteLine("采用一条一条插入的方式实现");
Stopwatch sw = new Stopwatch();
using (SqlConnection conn = new SqlConnection(StrConnMsg)) //using中会自动Open和Close 连接。
{
string sql = "INSERT INTO Product(Id,Name,Price) VALUES(newid(),@p,@d)";
conn.Open();
for (int i = 0; i < totalRow; i++)
{
using (SqlCommand cmd = new SqlCommand(sql, conn))
{
cmd.Parameters.AddWithValue("@p", "商品" + i);
cmd.Parameters.AddWithValue("@d", i);
sw.Start();
cmd.ExecuteNonQuery();
Console.WriteLine(string.Format("插入一条记录，已耗时{0}毫秒", sw.ElapsedMilliseconds));
}
if (i == getRow)
{
sw.Stop();
break;
}
}
}
Console.WriteLine(string.Format("插入{0}条记录，每{4}条的插入时间是{1}毫秒,预估总得插入时间是{2}毫秒，{3}分钟",
totalRow, sw.ElapsedMilliseconds, ((sw.ElapsedMilliseconds / getRow) * totalRow), GetMinute((sw.ElapsedMilliseconds / getRow * totalRow)), getRow));
}
static int GetMinute(long l)
{
return (Int32)l / 60000;
}
#endregion
运行结果如下：
我们会发现插入100w条记录，预计需要50分钟时间，每插入一条记录大概需要3毫秒左右。
方式二：使用SqlBulk
#region 方式二
static void InsertTwo()
{
Console.WriteLine("使用Bulk插入的实现方式");
Stopwatch sw = new Stopwatch();
DataTable dt = GetTableSchema();
using (SqlConnection conn = new SqlConnection(StrConnMsg))
{
SqlBulkCopy bulkCopy = new SqlBulkCopy(conn);
bulkCopy.DestinationTableName = "Product";
bulkCopy.BatchSize = dt.Rows.Count;
conn.Open();
sw.Start();
for (int i = 0; i < totalRow;i++ )
{
DataRow dr = dt.NewRow();
dr[0] = Guid.NewGuid();
dr[1] = string.Format("商品", i);
dr[2] = (decimal)i;
dt.Rows.Add(dr);
}
if (dt != null && dt.Rows.Count != 0)
{
bulkCopy.WriteToServer(dt);
sw.Stop();
}
Console.WriteLine(string.Format("插入{0}条记录共花费{1}毫秒，{2}分钟", totalRow, sw.ElapsedMilliseconds, GetMinute(sw.ElapsedMilliseconds)));
}
}
static DataTable GetTableSchema()
{
DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[] {
new DataColumn("Id",typeof(Guid)),
new DataColumn("Name",typeof(string)),
new DataColumn("Price",typeof(decimal))});
return dt;
}
#endregion
