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Overview
| Comment: | Add flags values to the Mem structure to accomodate BLOBs and to show the representation of strings. (CVS 1341) |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
3af283f483f75795d5b03dc8fd886aaf |
| User & Date: | drh 2004-05-10 12:07:11 |
Context
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2004-05-10
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| 16:18 | The btree.c module now passes all the historical regression tests. New tests for new functionality still need to be added. (CVS 1342) check-in: 433ae0d3 user: drh tags: trunk | |
| 12:07 | Add flags values to the Mem structure to accomodate BLOBs and to show the representation of strings. (CVS 1341) check-in: 3af283f4 user: drh tags: trunk | |
| 10:37 | Change the names of external symbols from sqlite_XXX to sqlite3_XXX. (CVS 1340) check-in: ac46bd68 user: danielk1977 tags: trunk | |
Changes
Changes to src/vdbeInt.h.
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** is an instance of the following structure.
*/
struct Mem {
int i; /* Integer value */
int n; /* Number of characters in string value, including '\0' */
int flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
double r; /* Real value */
char *z; /* String value */
char zShort[NBFS]; /* Space for short strings */
};
typedef struct Mem Mem;
/*
** Allowed values for Mem.flags
*/
#define MEM_Null 0x0001 /* Value is NULL */
#define MEM_Str 0x0002 /* Value is a string */
#define MEM_Int 0x0004 /* Value is an integer */
#define MEM_Real 0x0008 /* Value is a real number */
#define MEM_Dyn 0x0010 /* Need to call sqliteFree() on Mem.z */
#define MEM_Static 0x0020 /* Mem.z points to a static string */
#define MEM_Ephem 0x0040 /* Mem.z points to an ephemeral string */
#define MEM_Short 0x0080 /* Mem.z points to Mem.zShort */
/* The following MEM_ value appears only in AggElem.aMem.s.flag fields.
** It indicates that the corresponding AggElem.aMem.z points to a
** aggregate function context that needs to be finalized.
*/
#define MEM_AggCtx 0x0100 /* Mem.z points to an agg function context */
................................................................................
void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
int sqlite3VdbeSerialize(const Mem *, unsigned char *);
int sqlite3VdbeSerialLen(const Mem *);
int sqlite3VdbeDeserialize(Mem *, const unsigned char *);
int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
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** is an instance of the following structure.
*/
struct Mem {
int i; /* Integer value */
int n; /* Number of characters in string value, including '\0' */
int flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
double r; /* Real value */
char *z; /* String or BLOB value */
char zShort[NBFS]; /* Space for short strings */
};
typedef struct Mem Mem;
/*
** Allowed values for Mem.flags.
**
** The first 5 values determine the data type(s). Null and Blob must
** occur alone. But Str, Int, and Real can occur together.
**
** The next 3 utf entries determine the text representation for strings.
** These values are only meaningful if the type is Str.
**
** The last 4 values specify what kind of memory Mem.z points to.
** These valus are only meaningful if the Str or Blob types are used.
*/
#define MEM_Null 0x0001 /* Value is NULL */
#define MEM_Str 0x0002 /* Value is a string */
#define MEM_Int 0x0004 /* Value is an integer */
#define MEM_Real 0x0008 /* Value is a real number */
#define MEM_Blob 0x0010 /* Value is a BLOB */
#define MEM_Utf8 0x0020 /* String uses UTF-8 encoding */
#define MEM_Utf16be 0x0040 /* String uses UTF-16 big-endian */
#define MEM_Utf16le 0x0080 /* String uses UTF-16 little-endian */
#define MEM_Dyn 0x0100 /* Need to call sqliteFree() on Mem.z */
#define MEM_Static 0x0200 /* Mem.z points to a static string */
#define MEM_Ephem 0x0400 /* Mem.z points to an ephemeral string */
#define MEM_Short 0x0800 /* Mem.z points to Mem.zShort */
/* The following MEM_ value appears only in AggElem.aMem.s.flag fields.
** It indicates that the corresponding AggElem.aMem.z points to a
** aggregate function context that needs to be finalized.
*/
#define MEM_AggCtx 0x0100 /* Mem.z points to an agg function context */
................................................................................
void sqlite3VdbePrintOp(FILE*, int, Op*);
#endif
int sqlite3VdbeSerialize(const Mem *, unsigned char *);
int sqlite3VdbeSerialLen(const Mem *);
int sqlite3VdbeDeserialize(Mem *, const unsigned char *);
int sqlite2BtreeKeyCompare(BtCursor *, const void *, int, int, int *);
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