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SQLITE3_BLOB_WRITE(3)      Library Functions Manual      SQLITE3_BLOB_WRITE(3)

NAME
     sqlite3_blob_write - Write Data Into A BLOB Incrementally

SYNOPSIS
     int
     sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset);

DESCRIPTION
     This function is used to write data into an open BLOB handle from a
     caller-supplied buffer.  N bytes of data are copied from the buffer Z
     into the open BLOB, starting at offset iOffset.

     On success, sqlite3_blob_write() returns SQLITE_OK.  Otherwise, an  error
     code or an extended error code is returned.  Unless SQLITE_MISUSE is
     returned, this function sets the database connection error code and
     message accessible via sqlite3_errcode() and sqlite3_errmsg() and related
     functions.

     If the BLOB handle passed as the first argument was not opened for
     writing (the flags parameter to sqlite3_blob_open() was zero), this
     function returns SQLITE_READONLY.

     This function may only modify the contents of the BLOB; it is not
     possible to increase the size of a BLOB using this API.  If offset
     iOffset is less than N bytes from the end of the BLOB, SQLITE_ERROR is
     returned and no data is written.  The size of the BLOB (and hence the
     maximum value of N+iOffset) can be determined using the
     sqlite3_blob_bytes() interface.  If N or iOffset are less than zero
     SQLITE_ERROR is returned and no data is written.

     An attempt to write to an expired BLOB handle fails with an error code of
     SQLITE_ABORT.  Writes to the BLOB that occurred before the BLOB handle
     expired are not rolled back by the expiration of the handle, though of
     course those changes might have been overwritten by the statement that
     expired the BLOB handle or by other independent statements.

     This routine only works on a BLOB handle which has been created by a
     prior successful call to sqlite3_blob_open() and which has not been
     closed by sqlite3_blob_close().  Passing any other pointer in to this
     routine results in undefined and probably undesirable behavior.

SEE ALSO
     sqlite3_blob(3), sqlite3(3), sqlite3_blob_bytes(3),
     sqlite3_blob_close(3), sqlite3_blob_open(3), sqlite3_blob_read(3),
     sqlite3_errcode(3), SQLITE_OK(3)

NetBSD 8.0                      March 11, 2017                      NetBSD 8.0