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#1
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copyFromRecordset - vs - getRows
I'm extracting external numeric data from tables where the field type is
defined as a fixed length string (ie there are extra spaces in the field if the length of the number is less than the field size). Using ADO and the getRows method of a recordset to pass the results to an array before populating the range in the worksheet results in the strings being automatically converted to a number (except for entries that are definitely strings, such as all spaces of na etc). That was a feature of the .value method of a range I was pleasantly surprised by. However, if I use the .copyFromRecordset to pass the results directly to a range, the string for each number is written to each cell (eg "4.5 " instead of 4.5 that happens when using .value) My knowledge of SQL is limited, and I can't see anything in the recordset property that would allow for converting the type of the retrieved data from strings to numerics (really - just trimming the data of whitespace). my current workarround is to write the data with .copyFromRecordset, read the data back into an array and write it out immediately. Is it possible to avoid that last step either with some SQL or something in ADO that I've missed? cheers, Christophe |
#2
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copyFromRecordset - vs - getRows
ADO will make a best-guess at the data type, and it must be thinking these
are strings. Why not just continue with the first way that surprised you and worked for you? -- HTH Bob Phillips (remove nothere from email address if mailing direct) "Chris Short" wrote in message ... I'm extracting external numeric data from tables where the field type is defined as a fixed length string (ie there are extra spaces in the field if the length of the number is less than the field size). Using ADO and the getRows method of a recordset to pass the results to an array before populating the range in the worksheet results in the strings being automatically converted to a number (except for entries that are definitely strings, such as all spaces of na etc). That was a feature of the .value method of a range I was pleasantly surprised by. However, if I use the .copyFromRecordset to pass the results directly to a range, the string for each number is written to each cell (eg "4.5 " instead of 4.5 that happens when using .value) My knowledge of SQL is limited, and I can't see anything in the recordset property that would allow for converting the type of the retrieved data from strings to numerics (really - just trimming the data of whitespace). my current workarround is to write the data with .copyFromRecordset, read the data back into an array and write it out immediately. Is it possible to avoid that last step either with some SQL or something in ADO that I've missed? cheers, Christophe |
#3
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copyFromRecordset - vs - getRows
Hi Chris,
What provider are you using? SQL Server, Access, other? What does your SQL statement look like? I'm asking because I think it may be easier/more efficient to have the db convert the string to numeric - that way, your recordset field will be numeric, and Excel should treat the corresponding column as numeric. -- Regards, Jake Marx www.longhead.com [please keep replies in the newsgroup - email address unmonitored] Chris Short wrote: I'm extracting external numeric data from tables where the field type is defined as a fixed length string (ie there are extra spaces in the field if the length of the number is less than the field size). Using ADO and the getRows method of a recordset to pass the results to an array before populating the range in the worksheet results in the strings being automatically converted to a number (except for entries that are definitely strings, such as all spaces of na etc). That was a feature of the .value method of a range I was pleasantly surprised by. However, if I use the .copyFromRecordset to pass the results directly to a range, the string for each number is written to each cell (eg "4.5 " instead of 4.5 that happens when using .value) My knowledge of SQL is limited, and I can't see anything in the recordset property that would allow for converting the type of the retrieved data from strings to numerics (really - just trimming the data of whitespace). my current workarround is to write the data with .copyFromRecordset, read the data back into an array and write it out immediately. Is it possible to avoid that last step either with some SQL or something in ADO that I've missed? cheers, Christophe |
#4
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copyFromRecordset - vs - getRows
What provider are you using?
Ingres What does your SQL statement look like? very simple: SELECT value, period FROM relevant table WHERE (identifier = X) or (identifier = Y) or etc ORDER BY period (and the number of identifiers can be very large) I'm asking because I think it may be easier/more efficient to have the db convert the string to numeric That's what I was hoping. Bob Phillips asked why try to use .copyFromRecordset. It's because some testing shows that the speed differences are several orders of magnitude. I'm trying to get people to change some habits, so this speed carrot is important for me. thanks, Christopher |
#5
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copyFromRecordset - vs - getRows
Hi Chris,
Chris Short wrote: What does your SQL statement look like? very simple: SELECT value, period FROM relevant table WHERE (identifier = X) or (identifier = Y) or etc ORDER BY period You could try a CAST on the value column - I'm assuming that's the one that comes back as a string value? If all values within that column will be numeric, you could do this: SELECT CAST(value AS decimal(18,4)), period FROM relevant table WHERE (identifier = X) or (identifier = Y) or etc ORDER BY period -- Regards, Jake Marx www.longhead.com [please keep replies in the newsgroup - email address unmonitored] |
#6
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copyFromRecordset - vs - getRows
Jake said:
You could try a CAST on the value column - I'm assuming that's the one that comes back as a string value? Yup. Thank you very much for that. It's not working properly in that I'm getting an error: "Incorrect column expression: 'CAST(value AS Decimal(20,10))'" (I also tried casting it as float4 and float8 with the same error message. But that's enough for me to know where to start to look. much appreciated, Christopher |
#7
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copyFromRecordset - vs - getRows
Hi Chris,
Chris Short wrote: You could try a CAST on the value column - I'm assuming that's the one that comes back as a string value? Yup. Thank you very much for that. It's not working properly in that I'm getting an error: "Incorrect column expression: 'CAST(value AS Decimal(20,10))'" (I also tried casting it as float4 and float8 with the same error message. But that's enough for me to know where to start to look. It looks like the CAST function won't work in Ingres. Try using float4 or similar instead: SELECT float4(value), period FROM relevant table WHERE (identifier = X) or (identifier = Y) or etc ORDER BY period -- Regards, Jake Marx www.longhead.com [please keep replies in the newsgroup - email address unmonitored] |
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