SQL 数据插入、删除 大数据

--测试表
CREATE TABLE [dbo].[Employee] (
    [EmployeeNo] INT PRIMARY KEY,
    [EmployeeName] [nvarchar](50) NULL,
    [CreateUser] [nvarchar](50) NULL,
    [CreateDatetime] [datetime] NULL
);

--1、循环插入
SET STATISTICS TIME ON;
DECLARE @Index INT = 1;
DECLARE @Timer DATETIME = GETDATE();

WHILE @Index <= 100000
BEGIN
    INSERT [dbo].[Employee](EmployeeNo, EmployeeName, CreateUser, CreateDatetime) VALUES(@Index, 'Employee_' + CAST(@Index AS CHAR(6)), 'system', GETDATE());
    SET @Index = @Index + 1;
END

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;

--2、事务循环
BEGIN TRAN;
SET STATISTICS TIME ON;
DECLARE @Index INT = 1;
DECLARE @Timer DATETIME = GETDATE();

WHILE @Index <= 100000
BEGIN
    INSERT [dbo].[Employee](EmployeeNo, EmployeeName, CreateUser, CreateDatetime) VALUES(@Index, 'Employee_' + CAST(@Index AS CHAR(6)), 'system', GETDATE());
    SET @Index = @Index + 1;
END

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;
COMMIT;
--3、批量插入

SET STATISTICS TIME ON;
DECLARE @Timer DATETIME = GETDATE();

INSERT [dbo].[Employee](EmployeeNo, EmployeeName, CreateUser, CreateDatetime)
SELECT TOP(100000) EmployeeNo = ROW_NUMBER() OVER (ORDER BY C1.[OBJECT_ID]), 'Employee_', 'system', GETDATE()
FROM SYS.COLUMNS AS C1 CROSS JOIN SYS.COLUMNS AS C2
ORDER BY C1.[OBJECT_ID]

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;
--4、CET插入

SET STATISTICS TIME ON;
DECLARE @Timer DATETIME = GETDATE();

;WITH CTE(EmployeeNo, EmployeeName, CreateUser, CreateDatetime) AS(
    SELECT TOP(100000) EmployeeNo = ROW_NUMBER() OVER (ORDER BY C1.[OBJECT_ID]), 'Employee_', 'system', GETDATE()
    FROM SYS.COLUMNS AS C1 CROSS JOIN SYS.COLUMNS AS C2
    ORDER BY C1.[OBJECT_ID]
)
INSERT [dbo].[Employee] SELECT EmployeeNo, EmployeeName, CreateUser, CreateDatetime FROM CTE;

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;
--5、循环删除

SET STATISTICS TIME ON;
DECLARE @Timer DATETIME = GETDATE();

DELETE FROM [dbo].[Employee];

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;
--6、批量删除

SET STATISTICS TIME ON;
DECLARE @Timer DATETIME = GETDATE();

SET ROWCOUNT 100000;

WHILE 1 = 1
BEGIN
    BEGIN TRAN
    DELETE FROM [dbo].[Employee];
    COMMIT
    IF @@ROWCOUNT = 0
        BREAK;
END

SET ROWCOUNT 0;

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;
--6、Truncate删除

SET STATISTICS TIME ON;
DECLARE @Timer DATETIME = GETDATE();

TRUNCATE TABLE [dbo].[Employee];

SELECT DATEDIFF(MS, @Timer, GETDATE()) AS [执行时间(毫秒)];
SET STATISTICS TIME OFF;