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Extend the enhancement to json_set() and json_replace(). Clean up cruft.

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FossilOrigin-Name: 2dbb22c75e86f2e3ced38ac14b4943570d5c2f86cd5e37e875bf0c863be28836
This commit is contained in:
drh
2023-07-26 01:05:08 +00:00
parent 0f200bc580
commit 44f53b9647
6 changed files with 39 additions and 172 deletions
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45
src/sqliteInt.h
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@@ -4066,44 +4066,22 @@ struct sqlite3_str {
** The following object is the header for an "RCStr" or "reference-counted
** string". An RCStr is passed around and used like any other char*
** that has been dynamically allocated. The important interface
** difference is that it uses sqlite3RCStrUnref() as its destructor
** rather than sqlite3_free(). Other than that the two are interchangeable.
** differences:
**
** Thus to return an RCStr object as the result of an SQL function use:
**
** sqlite3_result_text64(ctx,z,sz,sqlite3RCStrUnref,SQLITE_UTF8)
** ^^^^^^^^^^^^^^^^^
** Instead of sqlite3_free() or similar
** 1. RCStr strings are reference counted. They are deallocated
** when the reference count reaches zero.
**
** An SQL function can check its arguments to see if they are RCStr
** strings using the sqlite3ValueIsOfClass() function:
** 2. Use sqlite3RCStrUnref() to free an RCStr string rather than
** sqlite3_free()
**
** sqlite3ValueIsOfClass(argv[i], sqlite3RCStrUnref);
**
** An RCStr string might be better than an ordinary string in some cases
** because:
**
** (1) You can duplicate it using sqlite3RCStrRef(x).
**
** (2) You can also add an associated object to the string. For
** example, if the string is JSON, perhaps the associated object
** is a parse of that JSON.
**
** Methods for an RCStr string begin with "sqlite3RCStr...".
** 3. Make a (read-only) copy of a read-only RCStr string using
** sqlite3RCStrRef().
*/
struct RCStr {
u32 nRCRef; /* Number of references */
#ifdef SQLITE_DEBUG
u32 uMagic; /* Magic number for sanity checking */
#endif
void *pAttach; /* Attachment to this string */
void (*xFree)(void*); /* Destructor for the attachment */
u64 nRCRef; /* Number of references */
/* Total structure size should be a multiple of 8 bytes for alignment */
};
/* The Magic number used by RCStr for sanity checking. SQLITE_DEBUG only. */
#define SQLITE_RCSTR_MAGIC 0x3dc05d54
/*
** A pointer to this structure is used to communicate information
** from sqlite3Init and OP_ParseSchema into the sqlite3InitCallback.
@@ -5222,7 +5200,6 @@ void sqlite3FileSuffix3(const char*, char*);
u8 sqlite3GetBoolean(const char *z,u8);
const void *sqlite3ValueText(sqlite3_value*, u8);
//int sqlite3ValueIsOfClass(const sqlite3_value*, void(*)(void*));
int sqlite3ValueBytes(sqlite3_value*, u8);
void sqlite3ValueSetStr(sqlite3_value*, int, const void *,u8,
void(*)(void*));
@@ -5333,11 +5310,7 @@ int sqlite3OpenTempDatabase(Parse *);
char *sqlite3RCStrRef(char*);
void sqlite3RCStrUnref(char*);
char *sqlite3RCStrNew(u64);
//u64 sqlite3RCStrSize(char*);
char *sqlite3RCStrResize(char*,u64);
//int sqlite3RCStrIsWriteable(char*);
//void sqlite3RCStrAttach(char*, void*, void(*)(void*));
//void *sqlite3RCStrGetAttachment(char*,void(*)(void*));
void sqlite3StrAccumInit(StrAccum*, sqlite3*, char*, int, int);
int sqlite3StrAccumEnlarge(StrAccum*, i64);