SQLServer 的 HTTP 请求功能

1、开启通信配置

sp_configure 'show advanced options', 1;
GO
RECONFIGURE;
GO
sp_configure 'Ole Automation Procedures', 1;
GO
RECONFIGURE;
GO
EXEC sp_configure 'Ole Automation Procedures';
GO

2、创建请求函数

CREATE FUNCTION dbo.HTTP_POST_FUNC(
    @URL VARCHAR(256),
    @DATA VARCHAR(2000),
    @REQ_H_ACCEPT VARCHAR(256),
    @REQ_H_CONTENT_TYPE VARCHAR(256)
)
RETURNS VARCHAR(5000)
AS
BEGIN
    DECLARE
        @object int,
        @returnStatus int,
        @returnText varchar(5000),
        @errMsg varchar(2000),
        @httpStatus varchar(20);
    /* 初始化 */
    EXEC @returnStatus = SP_OACreate 'Msxml2.ServerXMLHTTP.3.0',@object OUT;

    IF @returnStatus <> 0
        BEGIN
            EXEC SP_OAGetErrorInfo @object, @errMsg OUT, @returnText OUT;
            RETURN ('初始化对象失败，' + @errMsg + ISNULL(@returnText,''));
        END

    /* 创建链接 */
    EXEC @returnStatus= SP_OAMethod @object,'open',NULL,'post',@URL,'false';

    IF @returnStatus <> 0
        BEGIN
            EXEC SP_OAGetErrorInfo @object, @errMsg OUT, @returnText OUT;
            RETURN ('创建连接失败，' + @errMsg + ISNULL(@returnText, ''));
        END

    EXEC @returnStatus=SP_OAMethod @object,'setRequestHeader',NULL,'Accept',@REQ_H_ACCEPT;
    EXEC @returnStatus=SP_OAMethod @object,'setRequestHeader',NULL,'Content-Type',@REQ_H_CONTENT_TYPE;
    EXEC @returnStatus=SP_OAMethod @object,'setRequestHeader',NULL,'Content-Length','1000000';

    /* 发起请求 */
    EXEC @returnStatus= SP_OAMethod @object,'send',NULL,@DATA;
    IF @returnStatus <> 0
        BEGIN
            EXEC SP_OAGetErrorInfo @object, @errMsg OUT, @returnText OUT;
            RETURN ('发起请求失败，' + @errMsg + ISNULL(@returnText, ''));
        END
    /* 获取HTTP状态代码 */
    EXEC @returnStatus = SP_OAGetProperty @Object, 'Status', @httpStatus OUT;

    IF @returnStatus <> 0
        BEGIN
            EXEC sp_OAGetErrorInfo @Object, @errMsg OUT, @returnText OUT;
            RETURN ('获取HTTP状态代码失败，' + @errMsg + ISNULL(@returnText, ''));
        END
    IF @httpStatus <> 200
        BEGIN
            RETURN ('访问错误，HTTP状态代码:' + @httpStatus);
        END
    /* 获取返回信息 */
    EXEC @returnStatus= SP_OAGetProperty @object,'responseText',@returnText OUT;
    IF @returnStatus <> 0
        BEGIN
            EXEC SP_OAGetErrorInfo @object, @errMsg OUT, @returnText OUT;
            RETURN ('获取返回信息失败，' + @errMsg + ISNULL(@returnText, ''));
        END
    RETURN @returnText;
END;

3、调用请求函数

select dbo.HTTP_POST_FUNC('http://127.0.0.1:8081/dataApi',
        '{"operation":"postHttpRequest"}',
        'application/json',
        'application/json');