dataTable写入数据库（大数据写入）

例1：

connectionStr,链接字符串
dataTableName, 数据库中对应表名
sourceDataTable DataTable 要写入数据库的DataTable
字段要和表一致

public static void SqlBulkCopyByDataTable(string connectionStr, string dataTableName, DataTable sourceDataTable, int batchSize = 100000)
{
using (System.Data.SqlClient.SqlConnection connection = new System.Data.SqlClient.SqlConnection(connectionStr))
{
using (System.Data.SqlClient.SqlBulkCopy sqlBulkCopy = new System.Data.SqlClient.SqlBulkCopy(connectionStr,
System.Data.SqlClient.SqlBulkCopyOptions.UseInternalTransaction))
{
try
{
sqlBulkCopy.DestinationTableName = dataTableName;
sqlBulkCopy.BatchSize = batchSize;
for (int i = 0; i < sourceDataTable.Columns.Count; i++)
{
sqlBulkCopy.ColumnMappings.Add(sourceDataTable.Columns[i].ColumnName, sourceDataTable.Columns[i].ColumnName);
}
sqlBulkCopy.WriteToServer(sourceDataTable);
}
catch (Exception ex)
{

throw ex;
}
}
}
}

例2：

//省略连接字符串
 SqlConnection conn = new SqlConnection(".....");
 conn.Open();
 //初始化类
 using (System.Data.SqlClient.SqlBulkCopy sqlBC = new System.Data.SqlClient.SqlBulkCopy(conn))
 {
     //获取需要导入的数据表
     DataTable dt = GetDataTable();

     //每10W条数据一个事物
     sqlBC.BatchSize = 100000;

     //超时时间
     sqlBC.BulkCopyTimeout = 60;

     //表名Users
     sqlBC.DestinationTableName = "dbo.Users";

     //字段对应，分表为原数据表字段名，和导入数据库的字段名
     sqlBC.ColumnMappings.Add("Access_ID", "MSSQL_ID");
     sqlBC.ColumnMappings.Add("Access_Name", "MSSQL_Name");
     //sqlBC.ColumnMappings.Add("Access_...", "MSSQL_...");
     //sqlBC.ColumnMappings.Add("Access_...", "MSSQL_...");

     //导入到数据库
     sqlBC.WriteToServer(dt);