sql-server - 存储过程 - 将数据类型 varchar 转换为 float 时出错

Question

我试图将一个浮点值从一个表插入到另一个表中，但在这篇文章的主题行中收到错误:

将数据类型 varchar 转换为 float 时出错。

两个表中的两个字段都设置为 float 。值是邮政编码的纬度和经度。纬度/经度的示例是:

45.895698-72.365896

这是我的一些代码片段:

declare @v_latitude float
declare @v_longitude float

-- Grab Latitude & Longitude --
if @v_zip_code IS NOT NULL
SELECT @v_latitude=z_latitude, @v_longitude=z_longitude FROM tbl_ZipCodes WHERE z_zip_code = @v_zip_code

set @strValues = @strValues + '''' + @v_city + ''', ''' + @v_state + ''', ''' + @v_zip_code + ''', ''' + @v_daytime_phone + ''', ''' + @v_contact_name + ''', '''
+ @v_email_address + ''', '  + cast(@u_id as varchar) + ', ' +  cast(@d_id as varchar) + ', 1, ''' + cast(CURRENT_TIMESTAMP as varchar) + ''', 1 , ''' + cast(@v_latitude as float) + ''', ''' + cast(@v_longitude as float) + ''', '''
+ cast(CURRENT_TIMESTAMP as varchar) + ''', dft.df_t_id, (SELECT CASE WHEN dft.df_t_v_price <> 0 THEN dft.df_t_v_price WHEN dft.df_t_v_internet_price <> 0 THEN dft.df_t_v_internet_price WHEN dft.df_t_v_other_price <> 0 THEN dft.df_t_v_other_price ELSE 0 END AS v_search_price)'

使用@v_latitude 和@v_longitude 变量的代码部分在这里:

... , ''' + cast(@v_latitude as float) + ''', ''' + cast(@v_longitude as float) + ''', ...

忽略“...”，因为我正在演示这些值周围还有其他代码。

如有任何帮助，我们将不胜感激!

编辑:这是我正在使用的附加代码:

-- Check For User Profile --
SELECT @counter = COUNT(*) FROM tbl_Customers WHERE u_id = @u_id
if @counter > 0
    SELECT @v_city=c_city, @v_state =c_state, @v_zip_code=c_zip_code,@v_daytime_phone =c_phone_number FROM tbl_Customers WHERE u_id = @u_id
else
    SELECT @v_city=d_city, @v_state =d_state, @v_zip_code=d_zip_code,@v_daytime_phone =d_phone_number FROM tbl_Dealers WHERE d_id = @d_id

-- Grab Contact Information --
SELECT @v_contact_name = u_name, @v_email_address = u_email_address FROM tbl_Users WHERE u_id = @u_id


-- Grab Latitude & Longitude --
if @v_zip_code IS NOT NULL
    SELECT @v_latitude=z_latitude, @v_longitude=z_longitude FROM tbl_ZipCodes WHERE z_zip_code = @v_zip_code


-- Add Additional Fields --
set @strFields = @strFields + 'v_city, v_state, v_zip_code, v_daytime_phone, v_contact_name, v_email_address, u_id, d_id, v_processed, v_processed_date, v_active, ,v_latitude, v_longitude, v_last_activity, v_dealerfeed, v_search_price'
set @strJoin = @strJoin + ' LEFT JOIN tbl_Vehicles v ON v.v_stock_number = dft.df_t_v_stock_number'
set @strValues = @strValues + '''' + @v_city + ''', ''' + @v_state + ''', ''' + @v_zip_code + ''', ''' + @v_daytime_phone + ''', ''' + @v_contact_name + ''', '''
 + @v_email_address + ''', '  + cast(@u_id as varchar) + ', ' +  cast(@d_id as varchar) + ', 1, ''' + cast(CURRENT_TIMESTAMP as varchar) + ''', 1 , ''' + @v_latitude + ''', ''' + @v_longitude + ''', '''
 + cast(CURRENT_TIMESTAMP as varchar) + ''', dft.df_t_id, (SELECT CASE WHEN dft.df_t_v_price <> 0 THEN dft.df_t_v_price WHEN dft.df_t_v_internet_price <> 0 THEN dft.df_t_v_internet_price WHEN dft.df_t_v_other_price <> 0 THEN dft.df_t_v_other_price ELSE 0 END AS v_search_price)'

-- Insert Records Into Vehicle Table (but not twice!) --
set @strSQL = 'INSERT INTO tbl_Vehicles (' + @strFields + ') SELECT ' + @strValues + ' FROM tbl_DealerFeed_temp dft ' + @strJoin + ' WHERE dft.df_t_processed = 0 AND dft.df_d_id = ' +  cast(@df_d_id as varchar)
set @strSQL =  @strSQL + ' AND dft.df_t_v_stock_number NOT IN ( SELECT v.v_stock_number FROM tbl_Vehicles v WHERE v.d_id = ' + cast(@d_id as varchar) + ')'

print @strSQL

EXEC (@strSQL)

Answer 1

问题可能是您的动态 sql 在 float 周围放置了单引号。

尝试改变

 , ''' + cast(@v_latitude as float) + ''', ''' + cast(@v_longitude as float) + ''', ..

进入

 , ' + STR(@v_latitude,<length>,<decimals>) + ', ' + STR(@v_longitude,<length>,<decimals>) + ', ..

参见 STR ()供引用