将DataTable批量的整个值插入到postgreSQL表中 [英] Insert the whole value of DataTable bulk into postgreSQL table

问题描述

在SQL中，我们这样做是为了将数据批量插入到数据表中

In SQL we do something like this for bulk insert to datatable

SqlBulkCopy copy = new SqlBulkCopy(sqlCon);
copy.DestinationTableName = strDestinationTable;            
copy.WriteToServer(dtFrom);

Blockquote

但是在PostgreSQL中如何执行此操作

but in PostgreSQL how to do this operation

推荐答案

使用参数的简单插入

您的项目将需要引用以下程序集:Npgsql.如果此引用在 Visual Studio 中不可见，则:

Simple Insert Using Parameters

Your project will need to reference the following assembly: Npgsql. If this reference is not visible within Visual Studio, then:

1. 浏览到连接器的安装文件夹
2. 执行:GACInstall.exe
3. 重新启动 Visual Studio .

1. browse to the connector's installation folder
2. Execute: GACInstall.exe
3. Restart Visual Studio.

样品表

CREATE TABLE "OrderHistory"
(
  "OrderId" bigint NOT NULL,
  "TotalAmount" bigint,
  CONSTRAINT "OrderIdPk" PRIMARY KEY ("OrderId")
)
WITH (
  OIDS=FALSE
);
ALTER TABLE "OrderHistory"
  OWNER TO postgres;
GRANT ALL ON TABLE "OrderHistory" TO postgres;
GRANT ALL ON TABLE "OrderHistory" TO public;
ALTER TABLE "OrderHistory" ALTER COLUMN "OrderId" SET (n_distinct=1);

GRANT SELECT("OrderId"), UPDATE("OrderId"), INSERT("OrderId"), REFERENCES("OrderId") ON "OrderHistory" TO public;
GRANT SELECT("TotalAmount"), UPDATE("TotalAmount"), INSERT("TotalAmount"), REFERENCES("TotalAmount") ON "OrderHistory" TO public;

示例代码

请确保使用以下指令:

Sample Code

Be sure to use the following directives:

using Npgsql;
using NpgsqlTypes;

在您的方法中输入以下源代码:

Enter the following source code into your method:

// Make sure that the user has the INSERT privilege for the OrderHistory table.
NpgsqlConnection connection = new NpgsqlConnection("PORT=5432;TIMEOUT=15;POOLING=True;MINPOOLSIZE=1;MAXPOOLSIZE=20;COMMANDTIMEOUT=20;COMPATIBLE=2.2.4.3;DATABASE=test;HOST=127.0.0.1;PASSWORD=test;USER ID=test");

connection.Open();

DataSet dataSet = new DataSet();

NpgsqlDataAdapter dataAdapter = new NpgsqlDataAdapter("select * from OrderHistory where OrderId=-1", connection);
dataAdapter.InsertCommand = new NpgsqlCommand("insert into OrderHistory(OrderId, TotalAmount) " +
                        " values (:a, :b)", connection);
dataAdapter.InsertCommand.Parameters.Add(new NpgsqlParameter("a", NpgsqlDbType.Bigint));
dataAdapter.InsertCommand.Parameters.Add(new NpgsqlParameter("b", NpgsqlDbType.Bigint));
dataAdapter.InsertCommand.Parameters[0].Direction = ParameterDirection.Input;
dataAdapter.InsertCommand.Parameters[1].Direction = ParameterDirection.Input;
dataAdapter.InsertCommand.Parameters[0].SourceColumn = "OrderId";
dataAdapter.InsertCommand.Parameters[1].SourceColumn = "TotalAmount";

dataAdapter.Fill(dataSet);

DataTable newOrders = dataSet.Tables[0];
DataRow newOrder = newOrders.NewRow();
newOrder["OrderId"] = 20;
newOrder["TotalAmount"] = 20.0;

newOrders.Rows.Add(newOrder);
DataSet ds2 = dataSet.GetChanges();
dataAdapter.Update(ds2);
dataSet.Merge(ds2);
dataSet.AcceptChanges();

connection.Close();

关于性能的想法

原始帖子未提及性能要求.要求解决方案必须:

Thoughts On Performance

The original posting made no mention of performance requirements. It was requested that the solution must:

1. 使用DataTable
插入
2. 不使用循环插入数据

1. insert using a DataTable
2. insert data without using a loop

如果要插入大量数据，那么我建议您看一下性能选项. Postgres 文档建议您:

If you are inserting significant amounts of data, then I would suggest that you take a look at your performance options. The Postgres documentation suggests that you:

• 禁用自动提交
• 使用COPY命令
• 删除索引
• 删除外键约束
• 等

• Disable Autocommit
• Use the COPY command
• Remove indexes
• Remove Foreign Key Constraints
• etc.

有关优化Postgres插入的更多信息，请查看:

For more information about optimizing Postgres inserts, please take a look at:

• PostgresSql.org :插入数据
• PostgresSql.org:插入+性能提示
• StackOverflow :如何加快PostgreSQL中的插入性能

• PostgresSql.org: Inserting Data
• PostgresSql.org: Insert + Performance Tips
• StackOverflow: How to speed up insertion performance in PostgreSQL

此外，还有许多其他因素可能会影响系统的性能.有关高级介绍，请查看:

Also, there are a lot of other factors that can impact a system's performance. For a high level introduction, take a look at:

• ADO.NET SQL Server性能瓶颈
  • 这篇文章概述了用于优化性能的常规(即非SqlServer)策略.
  • .NET连接器是否支持 Postgres Copy命令?
    • 如果没有，则可以下载源代码 Npgsql连接器并添加您自己的BulkCopy()方法.请务必先查看源代码的许可协议.
    • Does the .NET connector support the Postgres Copy command?
      • If not, you can download the source code for the Npgsql connector and add your own BulkCopy() method. Be sure to review the source code's licensing agreement first.
      • 这种方法允许您将表传递到Postgres函数中，然后可以将数据直接插入目标中.
      • This approach allows you to pass in a table into a Postgres function which can then insert the data directly into the destination.
      • Postgres .NET Connector -免费 开源

      这篇关于将DataTable批量的整个值插入到postgreSQL表中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！