ORA-01843-无效的Oracle SQL月

Question

Below I am attempting to pull information from an oracle database. However, I keep getting this error:

Warning: oci_execute(): ORA-01843: not a valid month

Why is my code publishing this error? TIA!

Code:

$objConnect = oci_connect("user", "password", "(description=(address=(protocol=tcp)(host=host)(port=1533))(connect_data=(service_name=sid)))");
$weekSQL2 =  "SELECT * FROM INTOXDM.LSS_COP WHERE COP_WEEK = to_date('2014-08-06 00:00:00', 'yyyy-mm-dd HH24:MI:SS')";
$weekParse2 = oci_parse($objConnect, $weekSQL2);  
$weekExecute2 = oci_execute($weekParse2);
$week2 = oci_fetch_all($weekParse2,$week12);

NOTE

Here is what dates look like in my database:

2014-06-23 00:00:00.0

Which confuses me even more because my formatting is the exact same as what is in the database.

Answer 1

The most likely explanation is that COP_WEEK column is not defined as DATE , but some other datatype (eg VARCHAR),

For the OP query, Oracle is performing an implicit datatype conversion of the values in the COP_WEEK column, from VARCHAR to DATE . The implicit TO_DATE conversion is using format as specified in the client NLS_DATE_FORMAT variable, likely it's the default 'DD-MON-RR' . Whatever it is, it doesn't "match" what's stored in the column.

Or, if the NLS_DATE_FORMAT does match most of the values stored in the column, there's at least one that has a COP_WEEK value that doesn't match the format.

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One code "fix" (I put it in quotes because it's not really the right fix) is to make the conversion explicit, using the TO_DATE function:

WHERE TO_DATE(COP_WEEK,'yyyy-mm-dd HH24:MI:SS') = 

Another option for a code "fix" would be to compare the bare VARCHAR column to a VARCHAR literal

WHERE COP_WEEK = '2014-08-06 00:00:00.0'

This has the advantage of allowing Oracle to make use of an index, rather than requiring a conversion for every row...

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A better option would be to store COP_WEEK as a DATE datatype, rather than a VARCHAR, but that would be more than a change to your code.