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Code simplifications, especially to the pseudo-table logic, and comment

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improvements.

FossilOrigin-Name: 52449a9569b7142095cc88ee208b31cc59a3cab4
This commit is contained in:
drh
2009-09-08 01:14:48 +00:00
parent 417168ade2
commit 3e9ca09453
9 changed files with 104 additions and 137 deletions
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16
src/vdbeInt.h
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@@ -56,16 +56,12 @@ struct VdbeCursor {
Bool atFirst; /* True if pointing to first entry */
Bool useRandomRowid; /* Generate new record numbers semi-randomly */
Bool nullRow; /* True if pointing to a row with no data */
Bool pseudoTable; /* This is a NEW or OLD pseudo-tables of a trigger */
Bool ephemPseudoTable;
Bool deferredMoveto; /* A call to sqlite3BtreeMoveto() is needed */
Bool isTable; /* True if a table requiring integer keys */
Bool isIndex; /* True if an index containing keys only - no data */
i64 movetoTarget; /* Argument to the deferred sqlite3BtreeMoveto() */
Btree *pBt; /* Separate file holding temporary table */
int nData; /* Number of bytes in pData */
char *pData; /* Data for a NEW or OLD pseudo-table */
i64 iKey; /* Key for the NEW or OLD pseudo-table row */
int pseudoTableReg; /* Register holding pseudotable content. */
KeyInfo *pKeyInfo; /* Info about index keys needed by index cursors */
int nField; /* Number of fields in the header */
i64 seqCount; /* Sequence counter */
@@ -77,11 +73,15 @@ struct VdbeCursor {
int seekResult;
/* Cached information about the header for the data record that the
** cursor is currently pointing to. Only valid if cacheValid is true.
** cursor is currently pointing to. Only valid if cacheStatus matches
** Vdbe.cacheCtr. Vdbe.cacheCtr will never take on the value of
** CACHE_STALE and so setting cacheStatus=CACHE_STALE guarantees that
** the cache is out of date.
**
** aRow might point to (ephemeral) data for the current row, or it might
** be NULL.
*/
int cacheStatus; /* Cache is valid if this matches Vdbe.cacheCtr */
u32 cacheStatus; /* Cache is valid if this matches Vdbe.cacheCtr */
int payloadSize; /* Total number of bytes in the record */
u32 *aType; /* Type values for all entries in the record */
u32 *aOffset; /* Cached offsets to the start of each columns data */
@@ -296,7 +296,7 @@ struct Vdbe {
u32 magic; /* Magic number for sanity checking */
int nMem; /* Number of memory locations currently allocated */
Mem *aMem; /* The memory locations */
int cacheCtr; /* VdbeCursor row cache generation counter */
u32 cacheCtr; /* VdbeCursor row cache generation counter */
int pc; /* The program counter */
int rc; /* Value to return */
char *zErrMsg; /* Error message written here */