c#批量插入

一、创建一个用来测试的数据库和表

　　

 USE [Test]
 GO
 /****** Object:  Table [dbo].[student]    Script Date: 2019/4/11 15:38:59 ******/
 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO
 CREATE TABLE [dbo].[student](
     [id] [int] IDENTITY(,) NOT NULL,
     [name] [nvarchar]() NULL,
     [age] [int] NULL,
     [createDate] [datetime] NULL,
  CONSTRAINT [PK_student] PRIMARY KEY CLUSTERED
 (
     [id] ASC
 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
 ) ON [PRIMARY]

 GO

方式1：一条一条插入，性能最差　　

 INSERT INTO student(name,age,createDate) VALUES('苏拉自摸1',,'2018-4-11');
 INSERT INTO student(name,age,createDate) VALUES('苏拉自摸2',2,'2018-4-11');

         public 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(Conn)) //using中会自动Open和Close 连接。
             {
                 string sql = "INSERT INTO student(name,age,createDate) VALUES(@a,@p,@d)";
                 conn.Open();
                 for (int i = ; i < ; i++)
                 {
                     using (SqlCommand cmd = new SqlCommand(sql, conn))
                     {
                         cmd.Parameters.AddWithValue("@a", "花拉子模" + i);
                         cmd.Parameters.AddWithValue("@p", i);
                         cmd.Parameters.AddWithValue("@d", DateTime.Now);
                         sw.Start();
                         cmd.ExecuteNonQuery();
                         Console.WriteLine(string.Format("插入{0}条记录，已耗时{1}毫秒",i, sw.ElapsedMilliseconds));
                     }
                     if (i == )
                     {
                         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",
  , sw.ElapsedMilliseconds, ((sw.ElapsedMilliseconds / ) * ), GetMinute((sw.ElapsedMilliseconds /  * )), ));
         }

　　运行结果：

　　

　　100w条记录，插完要俩小时了

方式2：使用sqlBulk

　　语法如下：　

  BULK INSERT [ [ 'database_name'.][ 'owner' ].]{ 'table_name' FROM 'data_file' }
     WITH  (
             [ BATCHSIZE [ = batch_size ] ],
             [ CHECK_CONSTRAINTS ],
             [ CODEPAGE [ = 'ACP' | 'OEM' | 'RAW' | 'code_page' ] ],
             [ DATAFILETYPE [ = 'char' | 'native'| 'widechar' | 'widenative' ] ],
             [ FIELDTERMINATOR [ = 'field_terminator' ] ],
             [ FIRSTROW [ = first_row ] ],
             [ FIRE_TRIGGERS ],
             [ FORMATFILE = 'format_file_path' ],
             [ KEEPIDENTITY ],
             [ KEEPNULLS ],
             [ KILOBYTES_PER_BATCH [ = kilobytes_per_batch ] ],
             [ LASTROW [ = last_row ] ],
             [ MAXERRORS [ = max_errors ] ],
             [ ORDER ( { column [ ASC | DESC ] } [ ,...n ] ) ],
             [ ROWS_PER_BATCH [ = rows_per_batch ] ],
             [ ROWTERMINATOR [ = 'row_terminator' ] ],
             [ TABLOCK ],
     )  

　　相关参数说明：　　

 BULK INSERT
    [ database_name . [ schema_name ] . | schema_name . ] [ table_name | view_name ]
       FROM 'data_file'
      [ WITH
         (
    [ [ , ] BATCHSIZE = batch_size ]    --BATCHSIZE指令来设置在单个事务中可以插入到表中的记录的数量
    [ [ , ] CHECK_CONSTRAINTS ]     --指定在大容量导入操作期间，必须检查所有对目标表或视图的约束。若没有 CHECK_CONSTRAINTS 选项，则所有 CHECK 和 FOREIGN KEY 约束都将被忽略，并且在此操作之后表的约束将标记为不可信。
    [ [ , ] CODEPAGE = { 'ACP' | 'OEM' | 'RAW' | 'code_page' } ]  --指定该数据文件中数据的代码页
    [ [ , ] DATAFILETYPE =
       { 'char' | 'native'| 'widechar' | 'widenative' } ]  --指定 BULK INSERT 使用指定的数据文件类型值执行导入操作。
    [ [ , ] FIELDTERMINATOR = 'field_terminator' ]  --标识分隔内容的符号
    [ [ , ] FIRSTROW = first_row ]    --指定要加载的第一行的行号。默认值是指定数据文件中的第一行
    [ [ , ] FIRE_TRIGGERS ]     --是否启动触发器
    [ [ , ] FORMATFILE = 'format_file_path' ]
    [ [ , ] KEEPIDENTITY ]   --指定导入数据文件中的标识值用于标识列
    [ [ , ] KEEPNULLS ]    --指定在大容量导入操作期间空列应保留一个空值，而不插入用于列的任何默认值
    [ [ , ] KILOBYTES_PER_BATCH = kilobytes_per_batch ]
    [ [ , ] LASTROW = last_row ]   --指定要加载的最后一行的行号
    [ [ , ] MAXERRORS = max_errors ]   --指定允许在数据中出现的最多语法错误数，超过该数量后将取消大容量导入操作。
    [ [ , ] ORDER ( { column [ ASC | DESC ] } [ ,...n ] ) ]  --指定数据文件中的数据如何排序
    [ [ , ] ROWS_PER_BATCH = rows_per_batch ]
    [ [ , ] ROWTERMINATOR = 'row_terminator' ]   --标识分隔行的符号
    [ [ , ] TABLOCK ]     --指定为大容量导入操作持续时间获取一个表级锁
    [ [ , ] ERRORFILE = 'file_name' ]   --指定用于收集格式有误且不能转换为 OLE DB 行集的行的文件。
         )]   

　　代码：

　　

 public 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(Conn))
             {
                 SqlBulkCopy bulkCopy = new SqlBulkCopy(conn);
                 bulkCopy.DestinationTableName = "student";
                 bulkCopy.BatchSize = dt.Rows.Count;
                 conn.Open();
                 sw.Start();

                 for (int i = ; i < ; i++)
                 {
                     DataRow dr = dt.NewRow();
                     dr["name"] = "蔑儿乞人" + i;
                     dr["age"] = i;
                     dr["createDate"] = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
                     dt.Rows.Add(dr);
                 }
                 if (dt != null && dt.Rows.Count != )
                 {
                     bulkCopy.WriteToServer(dt);
                     sw.Stop();
                 }
                 Console.WriteLine(string.Format("插入{0}条记录共花费{1}毫秒，{2}分钟", , sw.ElapsedMilliseconds, GetMinute(sw.ElapsedMilliseconds)));
             }
         }
         public DataTable GetTableSchema()
         {
             DataTable dt = new DataTable();
             dt.Columns.AddRange(
                 new DataColumn[] {
         new DataColumn("name",typeof(string)),
         new DataColumn("age",typeof(int)),
         new DataColumn("createDate",typeof(DateTime ))});
             return dt;
         }

方式3：insert into

　　

INSERT INTO student(name,age,createDate)
 SELECT '托多1','2019-4-11',
 UNION ALL
 SELECT '托多2','2019-4-11',
 UNION ALL
...... 

四、拼接sql

　　

 INSERT INTO student(name,age,createDate)VALUES 
 ('牛栏1段',160,'2019-4-11') 
 ,('牛栏2段',260,'2019-4-11') 
 ......