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Add the experimental sqlite3_value_nochange() interface usable by xUpdate

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methods of virtual tables to see if a column has actually changed values.

FossilOrigin-Name: 8b7be15ece9e2e83959bb0e21e240106fe1077431242c3cc6b81f1baa2382f40
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drh
2018-01-12 21:00:14 +00:00
parent 4ec6f3a075
commit ce2fbd1b02
9 changed files with 56 additions and 24 deletions
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src/vdbeInt.h
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@@ -224,6 +224,8 @@ struct sqlite3_value {
** If the MEM_Null flag is set, then the value is an SQL NULL value.
** For a pointer type created using sqlite3_bind_pointer() or
** sqlite3_result_pointer() the MEM_Term and MEM_Subtype flags are also set.
** If both MEM_Null and MEM_Zero are set, that means that the value is
** an unchanging column value from VColumn.
**
** If the MEM_Str flag is set then Mem.z points at a string representation.
** Usually this is encoded in the same unicode encoding as the main