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SQL Server 批量插入數(shù)據(jù)的完美解決方案

 2020-12-17 15:20  來(lái)源: 腳本之家   我來(lái)投稿 撤稿糾錯(cuò)

  域名預(yù)訂/競(jìng)價(jià),好“米”不錯(cuò)過(guò)

這篇文章主要介紹了SQL Server 批量插入數(shù)據(jù)的完美解決方案,需要的朋友可以參考下

目錄

一、Sql Server插入方案介紹

二、SqlBulkCopy封裝代碼

1.方法介紹

2.實(shí)現(xiàn)原理

3.完整代碼

三、測(cè)試封裝代碼

1.測(cè)試代碼

四、代碼下載

一、Sql Server插入方案介紹

關(guān)于 SqlServer 批量插入的方式,有三種比較常用的插入方式,Insert、BatchInsert、SqlBulkCopy,下面我們對(duì)比以下三種方案的速度

1.普通的Insert插入方法

public static void Insert(IEnumerable<Person> persons)
{
  using (var con = new SqlConnection("Server=.;Database=DemoDataBase;User ID=sa;Password=8888;"))
  {
    con.Open();
    foreach (var person in persons)
    {
      using (var com = new SqlCommand(
        "INSERT INTO dbo.Person(Id,Name,Age,CreateTime,Sex)VALUES(@Id,@Name,@Age,@CreateTime,@Sex)",
        con))
      {
        com.Parameters.AddRange(new[]
        {
          new SqlParameter("@Id", SqlDbType.BigInt) {Value = person.Id},
          new SqlParameter("@Name", SqlDbType.VarChar, 64) {Value = person.Name},
          new SqlParameter("@Age", SqlDbType.Int) {Value = person.Age},
          new SqlParameter("@CreateTime", SqlDbType.DateTime)
            {Value = person.CreateTime ?? (object) DBNull.Value},
          new SqlParameter("@Sex", SqlDbType.Int) {Value = (int)person.Sex},
        });
        com.ExecuteNonQuery();
      }
    }
  }
}

2.拼接BatchInsert插入語(yǔ)句

public static void BatchInsert(Person[] persons)
{
  using (var con = new SqlConnection("Server=.;Database=DemoDataBase;User ID=sa;Password=8888;"))
  {
    con.Open();
    var pageCount = (persons.Length - 1) / 1000 + 1;
    for (int i = 0; i < pageCount; i++)
    {
      var personList = persons.Skip(i * 1000).Take(1000).ToArray();
      var values = personList.Select(p =>
        $"({p.Id},'{p.Name}',{p.Age},{(p.CreateTime.HasValue ? $"'{p.CreateTime:yyyy-MM-dd HH:mm:ss}'" : "NULL")},{(int) p.Sex})");
      var insertSql =
        $"INSERT INTO dbo.Person(Id,Name,Age,CreateTime,Sex)VALUES{string.Join(",", values)}";
      using (var com = new SqlCommand(insertSql, con))
      {
        com.ExecuteNonQuery();
      }
    }
  }
}

3.SqlBulkCopy插入方案

public static void BulkCopy(IEnumerable<Person> persons)
{
  using (var con = new SqlConnection("Server=.;Database=DemoDataBase;User ID=sa;Password=8888;"))
  {
    con.Open();
    var table = new DataTable();
    table.Columns.AddRange(new []
    {
      new DataColumn("Id", typeof(long)),
      new DataColumn("Name", typeof(string)),
      new DataColumn("Age", typeof(int)),
      new DataColumn("CreateTime", typeof(DateTime)),
      new DataColumn("Sex", typeof(int)),
    });
    foreach (var p in persons)
    {
      table.Rows.Add(new object[] {p.Id, p.Name, p.Age, p.CreateTime, (int) p.Sex});
    }

    using (var copy = new SqlBulkCopy(con))
    {
      copy.DestinationTableName = "Person";
      copy.WriteToServer(table);
    }
  }
}

3.三種方案速度對(duì)比

兩者插入效率對(duì)比,Insert明顯比SqlBulkCopy要慢太多,大概20~40倍性能差距,下面我們將SqlBulkCopy封裝一下,讓批量插入更加方便

二、SqlBulkCopy封裝代碼

1.方法介紹

批量插入擴(kuò)展方法簽名

這個(gè)方法主要解決了兩個(gè)問(wèn)題:

免去了手動(dòng)構(gòu)建DataTable或者IDataReader接口實(shí)現(xiàn)類(lèi),手動(dòng)構(gòu)建的轉(zhuǎn)換比較難以維護(hù),如果修改字段就得把這些地方都進(jìn)行修改,特別是還需要將枚舉類(lèi)型特殊處理,轉(zhuǎn)換成他的基礎(chǔ)類(lèi)型(默認(rèn)int)

不用親自創(chuàng)建SqlBulkCopy對(duì)象,和配置數(shù)據(jù)庫(kù)列的映射,和一些屬性的配置

此方案也是在我公司中使用,以滿足公司的批量插入數(shù)據(jù)的需求,例如第三方的對(duì)賬數(shù)據(jù)此方法使用的是Expression動(dòng)態(tài)生成數(shù)據(jù)轉(zhuǎn)換函數(shù),其效率和手寫(xiě)的原生代碼差不多,和原生手寫(xiě)代碼相比,多余的轉(zhuǎn)換損失很小【最大的性能損失都是在值類(lèi)型拆裝箱上】

此方案和其他網(wǎng)上的方案有些不同的是:不是將List先轉(zhuǎn)換成DataTable,然后寫(xiě)入SqlBulkCopy的,而是使用一個(gè)實(shí)現(xiàn)IDataReader的讀取器包裝List,每往SqlBulkCopy插入一行數(shù)據(jù)才會(huì)轉(zhuǎn)換一行數(shù)據(jù)

IDataReader方案和DataTable方案相比優(yōu)點(diǎn)

效率高:DataTable方案需要先完全轉(zhuǎn)換后,才能交由SqlBulkCopy寫(xiě)入數(shù)據(jù)庫(kù),而IDataReader方案可以邊轉(zhuǎn)換邊交給SqlBulkCopy寫(xiě)入數(shù)據(jù)庫(kù)(例如:10萬(wàn)數(shù)據(jù)插入速度可提升30%)

占用內(nèi)存少:DataTable方案需要先完全轉(zhuǎn)換后,才能交由SqlBulkCopy寫(xiě)入數(shù)據(jù)庫(kù),需要占用大量?jī)?nèi)存,而IDataReader方案可以邊轉(zhuǎn)換邊交給SqlBulkCopy寫(xiě)入數(shù)據(jù)庫(kù),無(wú)須占用過(guò)多內(nèi)存

強(qiáng)大:因?yàn)槭沁厡?xiě)入邊轉(zhuǎn)換,而且EnumerableReader傳入的是一個(gè)迭代器,可以實(shí)現(xiàn)持續(xù)插入數(shù)據(jù)的效果

2.實(shí)現(xiàn)原理

① 實(shí)體Model與表映射

數(shù)據(jù)庫(kù)表代碼

CREATE TABLE [dbo].[Person](
 [Id] [BIGINT] NOT NULL,
 [Name] [VARCHAR](64) NOT NULL,
 [Age] [INT] NOT NULL,
 [CreateTime] [DATETIME] NULL,
 [Sex] [INT] NOT NULL,
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]

實(shí)體類(lèi)代碼

public class Person
{
  public long Id { get; set; }
  public string Name { get; set; }
  public int Age { get; set; }
  public DateTime? CreateTime { get; set; }
  public Gender Sex { get; set; }
}

public enum Gender
{
  Man = 0,
  Woman = 1
}

創(chuàng)建字段映射【如果沒(méi)有此字段映射會(huì)導(dǎo)致數(shù)據(jù)填錯(cuò)位置,如果類(lèi)型不對(duì)還會(huì)導(dǎo)致報(bào)錯(cuò)】【因?yàn)椋簺](méi)有此字段映射默認(rèn)是按照列序號(hào)對(duì)應(yīng)插入的】

創(chuàng)建映射使用的SqlBulkCopy類(lèi)型的ColumnMappings屬性來(lái)完成,數(shù)據(jù)列與數(shù)據(jù)庫(kù)中列的映射

//創(chuàng)建批量插入對(duì)象
using (var copy = new SqlBulkCopy(connection, options, externalTransaction))
{
  foreach (var column in ModelToDataTable<TModel>.Columns)
  {
    //創(chuàng)建字段映射
    copy.ColumnMappings.Add(column.ColumnName, column.ColumnName);
  }
}

② 實(shí)體轉(zhuǎn)換成數(shù)據(jù)行

將數(shù)據(jù)轉(zhuǎn)換成數(shù)據(jù)行采用的是:反射+Expression來(lái)完成

其中反射是用于獲取編寫(xiě)Expression所需程序類(lèi),屬性等信息

其中Expression是用于生成高效轉(zhuǎn)換函數(shù)其中ModelToDataTable類(lèi)型利用了靜態(tài)泛型類(lèi)特性,實(shí)現(xiàn)泛型參數(shù)的緩存效果

在ModelToDataTable的靜態(tài)構(gòu)造函數(shù)中,生成轉(zhuǎn)換函數(shù),獲取需要轉(zhuǎn)換的屬性信息,并存入靜態(tài)只讀字段中,完成緩存

③ 使用IDataReader插入數(shù)據(jù)的重載

EnumerableReader是實(shí)現(xiàn)了IDataReader接口的讀取類(lèi),用于將模型對(duì)象,在迭代器中讀取出來(lái),并轉(zhuǎn)換成數(shù)據(jù)行,可供SqlBulkCopy讀取

SqlBulkCopy只會(huì)調(diào)用三個(gè)方法:GetOrdinal、Read、GetValue其中GetOrdinal只會(huì)在首行讀取每個(gè)列所代表序號(hào)【需要填寫(xiě):SqlBulkCopy類(lèi)型的ColumnMappings屬性】

其中Read方法是迭代到下一行,并調(diào)用ModelToDataTable.ToRowData.Invoke()來(lái)將模型對(duì)象轉(zhuǎn)換成數(shù)據(jù)行object[]其中GetValue方法是獲取當(dāng)前行指定下標(biāo)位置的值

3.完整代碼

擴(kuò)展方法類(lèi)

 public static class SqlConnectionExtension
  {
    /// <summary>
    /// 批量復(fù)制
    /// </summary>
    /// <typeparam name="TModel">插入的模型對(duì)象</typeparam>
    /// <param name="source">需要批量插入的數(shù)據(jù)源</param>
    /// <param name="connection">數(shù)據(jù)庫(kù)連接對(duì)象</param>
    /// <param name="tableName">插入表名稱【為NULL默認(rèn)為實(shí)體名稱】</param>
    /// <param name="bulkCopyTimeout">插入超時(shí)時(shí)間</param>
    /// <param name="batchSize">寫(xiě)入數(shù)據(jù)庫(kù)一批數(shù)量【如果為0代表全部一次性插入】最合適數(shù)量【這取決于您的環(huán)境,尤其是行數(shù)和網(wǎng)絡(luò)延遲。就個(gè)人而言,我將從BatchSize屬性設(shè)置為1000行開(kāi)始,然后看看其性能如何。如果可行,那么我將使行數(shù)加倍(例如增加到2000、4000等),直到性能下降或超時(shí)。否則,如果超時(shí)發(fā)生在1000,那么我將行數(shù)減少一半(例如500),直到它起作用為止?!?lt;/param>
    /// <param name="options">批量復(fù)制參數(shù)</param>
    /// <param name="externalTransaction">執(zhí)行的事務(wù)對(duì)象</param>
    /// <returns>插入數(shù)量</returns>
    public static int BulkCopy<TModel>(this SqlConnection connection,
      IEnumerable<TModel> source,
      string tableName = null,
      int bulkCopyTimeout = 30,
      int batchSize = 0,
      SqlBulkCopyOptions options = SqlBulkCopyOptions.Default,
      SqlTransaction externalTransaction = null)
    {
      //創(chuàng)建讀取器
      using (var reader = new EnumerableReader<TModel>(source))
      {
        //創(chuàng)建批量插入對(duì)象
        using (var copy = new SqlBulkCopy(connection, options, externalTransaction))
        {
          //插入的表
          copy.DestinationTableName = tableName ?? typeof(TModel).Name;
          //寫(xiě)入數(shù)據(jù)庫(kù)一批數(shù)量
          copy.BatchSize = batchSize;
          //超時(shí)時(shí)間
          copy.BulkCopyTimeout = bulkCopyTimeout;
          //創(chuàng)建字段映射【如果沒(méi)有此字段映射會(huì)導(dǎo)致數(shù)據(jù)填錯(cuò)位置,如果類(lèi)型不對(duì)還會(huì)導(dǎo)致報(bào)錯(cuò)】【因?yàn)椋簺](méi)有此字段映射默認(rèn)是按照列序號(hào)對(duì)應(yīng)插入的】
          foreach (var column in ModelToDataTable<TModel>.Columns)
          {
            //創(chuàng)建字段映射
            copy.ColumnMappings.Add(column.ColumnName, column.ColumnName);
          }
          //將數(shù)據(jù)批量寫(xiě)入數(shù)據(jù)庫(kù)
          copy.WriteToServer(reader);
          //返回插入數(shù)據(jù)數(shù)量
          return reader.Depth;
        }
      }
    }

    /// <summary>
    /// 批量復(fù)制-異步
    /// </summary>
    /// <typeparam name="TModel">插入的模型對(duì)象</typeparam>
    /// <param name="source">需要批量插入的數(shù)據(jù)源</param>
    /// <param name="connection">數(shù)據(jù)庫(kù)連接對(duì)象</param>
    /// <param name="tableName">插入表名稱【為NULL默認(rèn)為實(shí)體名稱】</param>
    /// <param name="bulkCopyTimeout">插入超時(shí)時(shí)間</param>
    /// <param name="batchSize">寫(xiě)入數(shù)據(jù)庫(kù)一批數(shù)量【如果為0代表全部一次性插入】最合適數(shù)量【這取決于您的環(huán)境,尤其是行數(shù)和網(wǎng)絡(luò)延遲。就個(gè)人而言,我將從BatchSize屬性設(shè)置為1000行開(kāi)始,然后看看其性能如何。如果可行,那么我將使行數(shù)加倍(例如增加到2000、4000等),直到性能下降或超時(shí)。否則,如果超時(shí)發(fā)生在1000,那么我將行數(shù)減少一半(例如500),直到它起作用為止?!?lt;/param>
    /// <param name="options">批量復(fù)制參數(shù)</param>
    /// <param name="externalTransaction">執(zhí)行的事務(wù)對(duì)象</param>
    /// <returns>插入數(shù)量</returns>
    public static async Task<int> BulkCopyAsync<TModel>(this SqlConnection connection,
      IEnumerable<TModel> source,
      string tableName = null,
      int bulkCopyTimeout = 30,
      int batchSize = 0,
      SqlBulkCopyOptions options = SqlBulkCopyOptions.Default,
      SqlTransaction externalTransaction = null)
    {
      //創(chuàng)建讀取器
      using (var reader = new EnumerableReader<TModel>(source))
      {
        //創(chuàng)建批量插入對(duì)象
        using (var copy = new SqlBulkCopy(connection, options, externalTransaction))
        {
          //插入的表
          copy.DestinationTableName = tableName ?? typeof(TModel).Name;
          //寫(xiě)入數(shù)據(jù)庫(kù)一批數(shù)量
          copy.BatchSize = batchSize;
          //超時(shí)時(shí)間
          copy.BulkCopyTimeout = bulkCopyTimeout;
          //創(chuàng)建字段映射【如果沒(méi)有此字段映射會(huì)導(dǎo)致數(shù)據(jù)填錯(cuò)位置,如果類(lèi)型不對(duì)還會(huì)導(dǎo)致報(bào)錯(cuò)】【因?yàn)椋簺](méi)有此字段映射默認(rèn)是按照列序號(hào)對(duì)應(yīng)插入的】
          foreach (var column in ModelToDataTable<TModel>.Columns)
          {
            //創(chuàng)建字段映射
            copy.ColumnMappings.Add(column.ColumnName, column.ColumnName);
          }
          //將數(shù)據(jù)批量寫(xiě)入數(shù)據(jù)庫(kù)
          await copy.WriteToServerAsync(reader);
          //返回插入數(shù)據(jù)數(shù)量
          return reader.Depth;
        }
      }
    }
  }

封裝的迭代器數(shù)據(jù)讀取器

 /// <summary>
  /// 迭代器數(shù)據(jù)讀取器
  /// </summary>
  /// <typeparam name="TModel">模型類(lèi)型</typeparam>
  public class EnumerableReader<TModel> : IDataReader
  {
    /// <summary>
    /// 實(shí)例化迭代器讀取對(duì)象
    /// </summary>
    /// <param name="source">模型源</param>
    public EnumerableReader(IEnumerable<TModel> source)
    {
      _source = source ?? throw new ArgumentNullException(nameof(source));
      _enumerable = source.GetEnumerator();
    }

    private readonly IEnumerable<TModel> _source;
    private readonly IEnumerator<TModel> _enumerable;
    private object[] _currentDataRow = Array.Empty<object>();
    private int _depth;
    private bool _release;

    public void Dispose()
    {
      _release = true;
      _enumerable.Dispose();
    }

    public int GetValues(object[] values)
    {
      if (values == null) throw new ArgumentNullException(nameof(values));
      var length = Math.Min(_currentDataRow.Length, values.Length);
      Array.Copy(_currentDataRow, values, length);
      return length;
    }

    public int GetOrdinal(string name)
    {
      for (int i = 0; i < ModelToDataTable<TModel>.Columns.Count; i++)
      {
        if (ModelToDataTable<TModel>.Columns[i].ColumnName == name) return i;
      }

      return -1;
    }

    public long GetBytes(int ordinal, long dataIndex, byte[] buffer, int bufferIndex, int length)
    {
      if (dataIndex < 0) throw new Exception($"起始下標(biāo)不能小于0!");
      if (bufferIndex < 0) throw new Exception("目標(biāo)緩沖區(qū)起始下標(biāo)不能小于0!");
      if (length < 0) throw new Exception("讀取長(zhǎng)度不能小于0!");
      var numArray = (byte[])GetValue(ordinal);
      if (buffer == null) return numArray.Length;
      if (buffer.Length <= bufferIndex) throw new Exception("目標(biāo)緩沖區(qū)起始下標(biāo)不能大于目標(biāo)緩沖區(qū)范圍!");
      var freeLength = Math.Min(numArray.Length - bufferIndex, length);
      if (freeLength <= 0) return 0;
      Array.Copy(numArray, dataIndex, buffer, bufferIndex, length);
      return freeLength;
    }

    public long GetChars(int ordinal, long dataIndex, char[] buffer, int bufferIndex, int length)
    {
      if (dataIndex < 0) throw new Exception($"起始下標(biāo)不能小于0!");
      if (bufferIndex < 0) throw new Exception("目標(biāo)緩沖區(qū)起始下標(biāo)不能小于0!");
      if (length < 0) throw new Exception("讀取長(zhǎng)度不能小于0!");
      var numArray = (char[])GetValue(ordinal);
      if (buffer == null) return numArray.Length;
      if (buffer.Length <= bufferIndex) throw new Exception("目標(biāo)緩沖區(qū)起始下標(biāo)不能大于目標(biāo)緩沖區(qū)范圍!");
      var freeLength = Math.Min(numArray.Length - bufferIndex, length);
      if (freeLength <= 0) return 0;
      Array.Copy(numArray, dataIndex, buffer, bufferIndex, length);
      return freeLength;
    }

    public bool IsDBNull(int i)
    {
      var value = GetValue(i);
      return value == null || value is DBNull;
    }
    public bool NextResult()
    {
      //移動(dòng)到下一個(gè)元素
      if (!_enumerable.MoveNext()) return false;
      //行層+1
      Interlocked.Increment(ref _depth);
      //得到數(shù)據(jù)行
      _currentDataRow = ModelToDataTable<TModel>.ToRowData.Invoke(_enumerable.Current);
      return true;
    }

    public byte GetByte(int i) => (byte)GetValue(i);
    public string GetName(int i) => ModelToDataTable<TModel>.Columns[i].ColumnName;
    public string GetDataTypeName(int i) => ModelToDataTable<TModel>.Columns[i].DataType.Name;
    public Type GetFieldType(int i) => ModelToDataTable<TModel>.Columns[i].DataType;
    public object GetValue(int i) => _currentDataRow[i];
    public bool GetBoolean(int i) => (bool)GetValue(i);
    public char GetChar(int i) => (char)GetValue(i);
    public Guid GetGuid(int i) => (Guid)GetValue(i);
    public short GetInt16(int i) => (short)GetValue(i);
    public int GetInt32(int i) => (int)GetValue(i);
    public long GetInt64(int i) => (long)GetValue(i);
    public float GetFloat(int i) => (float)GetValue(i);
    public double GetDouble(int i) => (double)GetValue(i);
    public string GetString(int i) => (string)GetValue(i);
    public decimal GetDecimal(int i) => (decimal)GetValue(i);
    public DateTime GetDateTime(int i) => (DateTime)GetValue(i);
    public IDataReader GetData(int i) => throw new NotSupportedException();
    public int FieldCount => ModelToDataTable<TModel>.Columns.Count;
    public object this[int i] => GetValue(i);
    public object this[string name] => GetValue(GetOrdinal(name));
    public void Close() => Dispose();
    public DataTable GetSchemaTable() => ModelToDataTable<TModel>.ToDataTable(_source);
    public bool Read() => NextResult();
    public int Depth => _depth;
    public bool IsClosed => _release;
    public int RecordsAffected => 0;
  }

模型對(duì)象轉(zhuǎn)數(shù)據(jù)行工具類(lèi)

/// <summary>
  /// 對(duì)象轉(zhuǎn)換成DataTable轉(zhuǎn)換類(lèi)
  /// </summary>
  /// <typeparam name="TModel">泛型類(lèi)型</typeparam>
  public static class ModelToDataTable<TModel>
  {
    static ModelToDataTable()
    {
      //如果需要剔除某些列可以修改這段代碼
      var propertyList = typeof(TModel).GetProperties().Where(w => w.CanRead).ToArray();
      Columns = new ReadOnlyCollection<DataColumn>(propertyList
        .Select(pr => new DataColumn(pr.Name, GetDataType(pr.PropertyType))).ToArray());
      //生成對(duì)象轉(zhuǎn)數(shù)據(jù)行委托
      ToRowData = BuildToRowDataDelegation(typeof(TModel), propertyList);
    }

    /// <summary>
    /// 構(gòu)建轉(zhuǎn)換成數(shù)據(jù)行委托
    /// </summary>
    /// <param name="type">傳入類(lèi)型</param>
    /// <param name="propertyList">轉(zhuǎn)換的屬性</param>
    /// <returns>轉(zhuǎn)換數(shù)據(jù)行委托</returns>
    private static Func<TModel, object[]> BuildToRowDataDelegation(Type type, PropertyInfo[] propertyList)
    {
      var source = Expression.Parameter(type);
      var items = propertyList.Select(property => ConvertBindPropertyToData(source, property));
      var array = Expression.NewArrayInit(typeof(object), items);
      var lambda = Expression.Lambda<Func<TModel, object[]>>(array, source);
      return lambda.Compile();
    }

    /// <summary>
    /// 將屬性轉(zhuǎn)換成數(shù)據(jù)
    /// </summary>
    /// <param name="source">源變量</param>
    /// <param name="property">屬性信息</param>
    /// <returns>獲取屬性數(shù)據(jù)表達(dá)式</returns>
    private static Expression ConvertBindPropertyToData(ParameterExpression source, PropertyInfo property)
    {
      var propertyType = property.PropertyType;
      var expression = (Expression)Expression.Property(source, property);
      if (propertyType.IsEnum)
        expression = Expression.Convert(expression, propertyType.GetEnumUnderlyingType());
      return Expression.Convert(expression, typeof(object));
    }

    /// <summary>
    /// 獲取數(shù)據(jù)類(lèi)型
    /// </summary>
    /// <param name="type">屬性類(lèi)型</param>
    /// <returns>數(shù)據(jù)類(lèi)型</returns>
    private static Type GetDataType(Type type)
    {
      //枚舉默認(rèn)轉(zhuǎn)換成對(duì)應(yīng)的值類(lèi)型
      if (type.IsEnum)
        return type.GetEnumUnderlyingType();
      //可空類(lèi)型
      if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
        return GetDataType(type.GetGenericArguments().First());
      return type;
    }

    /// <summary>
    /// 列集合
    /// </summary>
    public static IReadOnlyList<DataColumn> Columns { get; }

    /// <summary>
    /// 對(duì)象轉(zhuǎn)數(shù)據(jù)行委托
    /// </summary>
    public static Func<TModel, object[]> ToRowData { get; }

    /// <summary>
    /// 集合轉(zhuǎn)換成DataTable
    /// </summary>
    /// <param name="source">集合</param>
    /// <param name="tableName">表名稱</param>
    /// <returns>轉(zhuǎn)換完成的DataTable</returns>
    public static DataTable ToDataTable(IEnumerable<TModel> source, string tableName = "TempTable")
    {
      //創(chuàng)建表對(duì)象
      var table = new DataTable(tableName);
      //設(shè)置列
      foreach (var dataColumn in Columns)
      {
        table.Columns.Add(new DataColumn(dataColumn.ColumnName, dataColumn.DataType));
      }

      //循環(huán)轉(zhuǎn)換每一行數(shù)據(jù)
      foreach (var item in source)
      {
        table.Rows.Add(ToRowData.Invoke(item));
      }

      //返回表對(duì)象
      return table;
    }
  }

三、測(cè)試封裝代碼

1.測(cè)試代碼

創(chuàng)表代碼

CREATE TABLE [dbo].[Person](
 [Id] [BIGINT] NOT NULL,
 [Name] [VARCHAR](64) NOT NULL,
 [Age] [INT] NOT NULL,
 [CreateTime] [DATETIME] NULL,
 [Sex] [INT] NOT NULL,
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]

實(shí)體類(lèi)代碼

定義的實(shí)體的屬性名稱需要和SqlServer列名稱類(lèi)型對(duì)應(yīng)

public class Person
{
  public long Id { get; set; }
  public string Name { get; set; }
  public int Age { get; set; }
  public DateTime? CreateTime { get; set; }
  public Gender Sex { get; set; }
}

public enum Gender
{
  Man = 0,
  Woman = 1
}

測(cè)試方法

//生成10萬(wàn)條數(shù)據(jù)
var persons = new Person[100000];
var random = new Random();
for (int i = 0; i < persons.Length; i++)
{
  persons[i] = new Person
  {
    Id = i + 1,
    Name = "張三" + i,
    Age = random.Next(1, 128),
    Sex = (Gender)random.Next(2),
    CreateTime = random.Next(2) == 0 ? null : (DateTime?) DateTime.Now.AddSeconds(i)
  };
}

//創(chuàng)建數(shù)據(jù)庫(kù)連接
using (var conn = new SqlConnection("Server=.;Database=DemoDataBase;User ID=sa;Password=8888;"))
{
  conn.Open();
  var sw = Stopwatch.StartNew();
  //批量插入數(shù)據(jù)
  var qty = conn.BulkCopy(persons);
  sw.Stop();
  Console.WriteLine(sw.Elapsed.TotalMilliseconds + "ms");
}

執(zhí)行批量插入結(jié)果

226.4767ms

請(qǐng)按任意鍵繼續(xù). . .

四、代碼下載

GitHub代碼地址:https://github.com/liu-zhen-liang/PackagingComponentsSet/tree/main/SqlBulkCopyComponents

來(lái)源:腳本之家

鏈接:https://www.jb51.net/article/201634.htm

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