sql server 根据身份证号计算出生日期和年龄的存储过程

我这边有一个业务，需要客户填写身份证号，自动计算他的出生日期和年龄

在sql中，具体的存储过程实现是这样的：

/***********************************************
根据身份证号计算出生日期和年龄
Date：2017-10-15
Author：xzl
条件：身份证号码
返回：出生日期和年龄
***********************************************/
/***
*根据身份证号计算出生日期和年龄
***/
create proc [dbo].[sp_GetBirthDate_Age]
    @IDCard varchar(20),
    @BirthDate varchar(20) output,
    @Age int output
as
begin
    --声明变量--
    declare @BirthDateStr varchar(10)
    declare @YearStr varchar(10)
    declare @MonthStr varchar(10)
    declare @DayStr varchar(10)
    declare @NowDateStr varchar(20)
    declare @AgeStr varchar(10)

    ----1、根据身份证号，计算出生日期---
    --设置IDCard值
    --set @IDCard ='445182199403123781'
    --1）获取身份证号中年月日部分（返回：19940312）--
    set @BirthDateStr = SUBSTRING(@IDCard,7,8)
    --2）将获取年月日字符串转化为对应日期格式--
    --2.1）获取年部分--
    set @YearStr = SUBSTRING(@BirthDateStr,1,4)
    --2.2）获取月部分--
    set @MonthStr = SUBSTRING(@BirthDateStr,5,2)
    --2.3）获取日部分--
    set @DayStr = SUBSTRING(@BirthDateStr,7,2)
    --3）返回组合后的日期---
    set @BirthDate = @YearStr +'-'+@MonthStr+'-'+@DayStr

    --2、根据出生日期和当前日期，计算年龄--
    --1）获取当前时间的日期部分（返回：2017-10-15）--
    set @NowDateStr = CONVERT(varchar(10),GETDATE(),23)
    --2）获取当前日期与出生日期的年份(年龄)  返回：23岁 --
    set @AgeStr = DATEDIFF(YEAR,@BirthDate,@NowDateStr)
    --3）判断当前日期与出生日期（是否过生日,未过生日减去1岁）--
    if(SUBSTRING(@BirthDate,6,5) <= SUBSTRING(@NowDateStr,6,5))
       begin
            --Cast()将字符转化为数字函数
            set @Age = CAST(@AgeStr as int)
       end
    else
      begin
           set @Age = CAST(@AgeStr as int)-1
      end
    --输出计算后的返回结果--
    select @BirthDate as 出生日期,@Age as 年龄
end 

在sql中，执行上面可在可编程性-->存储过程中看到创建的存储过程

存储过程的调用：

--测试1：出生日期已过当前日期的---
declare @IDCard varchar(20)
declare @BirthDate varchar(20)
declare @Age int
set @IDCard=''
exec sp_GetBirthDate_Age @IDCard,@BirthDate output,@Age output
--返回结果--
--出生日期：1994-10-10  年龄： 23

--测试2：出生日期未过当前日期的---
declare @IDCard varchar(20)
declare @BirthDate varchar(20)
declare @Age int
set @IDCard=''
exec sp_GetBirthDate_Age @IDCard,@BirthDate output,@Age output
--返回结果--
--出生日期：1994-10-18  年龄： 22

调用后结果：

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