多项目共用SQL 添加需要字段

当有多个项目，每个项目均有一个相同的表，当多个项目共同使用同一套代码时，有一天需求增加了字段，如何保证其他项目不报错

解决方案

-- 添加高温字段（带存在性检查）
IF NOT EXISTS (SELECT * FROM sys.columns 
               WHERE object_id = OBJECT_ID(N'sys_barninfo') 
               AND name = 'HighTemperature')
BEGIN
    ALTER TABLE sys_barninfo ADD HighTemperature DECIMAL(5,1) NULL;
    
    IF NOT EXISTS (SELECT * FROM sys.extended_properties 
                   WHERE major_id = OBJECT_ID(N'sys_barninfo') 
                   AND minor_id = COLUMNPROPERTY(OBJECT_ID(N'sys_barninfo'), 'HighTemperature', 'ColumnId')
                   AND name = N'MS_Description')
    BEGIN
        EXEC sys.sp_addextendedproperty 
            @name = N'MS_Description', 
            @value = N'高温值，精确到小数点后一位', 
            @level0type = N'SCHEMA', @level0name = 'dbo',
            @level1type = N'TABLE',  @level1name = 'sys_barninfo',
            @level2type = N'COLUMN', @level2name = 'HighTemperature';
    END
END

-- 添加低温字段（带存在性检查）
IF NOT EXISTS (SELECT * FROM sys.columns 
               WHERE object_id = OBJECT_ID(N'sys_barninfo') 
               AND name = 'LowTemperature')
BEGIN
    ALTER TABLE sys_barninfo ADD LowTemperature DECIMAL(5,1) NULL;
    
    IF NOT EXISTS (SELECT * FROM sys.extended_properties 
                   WHERE major_id = OBJECT_ID(N'sys_barninfo') 
                   AND minor_id = COLUMNPROPERTY(OBJECT_ID(N'sys_barninfo'), 'LowTemperature', 'ColumnId')
                   AND name = N'MS_Description')
    BEGIN
        EXEC sys.sp_addextendedproperty 
            @name = N'MS_Description', 
            @value = N'低温值，精确到小数点后一位', 
            @level0type = N'SCHEMA', @level0name = 'dbo',
            @level1type = N'TABLE',  @level1name = 'sys_barninfo',
            @level2type = N'COLUMN', @level2name = 'LowTemperature';
    END
END