FreeTDS Development Group

[Trygve Liland <Trygve.Liland AT visma.no>]

Hi

We are doing a test using FreeTDS  on Solaris moving a Fortran/C application 
from Sybase to MS-Sql server.
Recently we ran into a problem I'm hoping to get a hint on how to solve.

Simplified we are doing:

-          Update IMAGECOLTAB set IMAGECOL=NULL

-          Select IMAGECOL from IMAGECOLTAB

-          Get Pointer to IMAGECOL from dbtextptr

-          Get TimeStamp from dbtexttimestamp

-          Do dbwritetext with length of image to be written and NULL in last 
parameter

-          Loop text and do dbmoretext
The problem is that we are getting
tds_put_string: "writetext bulk IMAGECOLTAB.IMAGECOL 
0x00000000000000000000000000000000 timestamp = 0x0000000000000000 with log"
Invalid text, ntext, or image pointer value 
0x00000000000000000000000000000000.

Any idea on what we are doing wrong? I have checked code that we have in 
another program where we used dblib against Ms-Sqlserver, and I see more or 
less the same code.

Below is a simplified C code for my function, and the resulting tds log file.

Our function:
    DBBINARY       *txtptr;
    unsigned char   buff[WIDEBUFSIZE];
    unsigned char   tabCol[100];
    QueryTable *pqq, *pqu;             /* Pointer to current table */
    DBBINARY   tsStamp[DBTXTSLEN];
    DBBINARY   txtPointer[DBTXPLEN];

/* Set the widecolumn to NULL to simplify the storage process */
    //Execute "update IMAGECOLTAB set IMAGECOL=NULL where ID=1"

                /* Select the record to obtain the text's timestamp */
    //Execute "select IMAGECOL from IMAGECOLTAB where ID=1"
                //pqq is query pointer

    sprintf((char *)tabCol, "IMAGECOLTAB.IMAGECOL");

                /* We must have a valid textpointer */
    if ((txtptr = dbtxptr(pqq->DbProc, 1)) == NULL) {
        return;
    }
                memcpy(txtPointer, txtptr, DBTXPLEN);
                memcpy(tsStamp, dbtxtimestamp(pqq->DbProc, 1), DBTXTSLEN);

    if ((dbwritetext(pqu->DbProc, tabCol, txtPointer, DBTXPLEN, tsStamp, 
TRUE, (DBINT) NoBytes, NULL))!= SUCCEED)
                               return;
    if ((dbsqlok(pqu->DbProc)) != SUCCEED)
                               return;
    if ((dbresults(pqu->DbProc)) != SUCCEED)
                               return;

    /* Now, read all data from file and store into database */
    SomeStored = 0;
    while ((BytesRead = read(filePointer, buff, WIDEBUFSIZE)) > 0) {
                               if ((dbmoretext(pqu->DbProc, (DBINT) 
BytesRead, (LPCBYTE)buff)) != SUCCEED)
                                               return;
                               if (!SomeStored)
                                               SomeStored = 1;
    }

    if (SomeStored) {
                               if ((dbsqlok(pqu->DbProc)) != SUCCEED)
                                               return;
                               if ((dbresults(pqu->DbProc)) != SUCCEED)
                                               return;
    }

The TDS log file  (IMAGECOLTAB=PLOTHEAD, IMANGECOL=CONTENTS):
10:38:18.662559 5857 (dblib.c:1312):dbcmd(a74160, update PLOTHEAD set 
CONTENTS=NULL where MODULE='MAP' and PLOTNAME='ON-TEST-15MAI2012')
Snip
10:38:18.671062 5857 (dblib.c:1312):dbcmd(a74160, select CONTENTS from 
PLOTHEAD where MODULE='MAP' and PLOTNAME='ON-TEST-15MAI2012')
10:38:18.671068 5857 (dblib.c:1319):dbcmd() bufsz = 103
10:38:18.671074 5857 (dblib.c:5882):dbfreebuf(a74160)
10:38:18.671080 5857 (dblib.c:1369):dbsqlexec(a74160)
10:38:18.671086 5857 (dblib.c:6862):dbsqlsend(a74160)
10:38:18.671092 5857 (mem.c:615):tds_free_all_results()
10:38:18.671098 5857 (util.c:156):Changed query state from IDLE to QUERYING
10:38:18.671104 5857 (write.c:140):tds_put_string converting 98 bytes of 
"select CONTENTS from PLOTHEAD where MODULE='MAP' and INITIAL='ON' and 
PLOTNAME='ON-TEST-15MAI2012'"
Snip
10:38:18.671220 5857 (token.c:540):tds_process_tokens(a72e18, ffbdeb1c, 
ffbdeb18, 0x6914)
10:38:18.671227 5857 (util.c:156):Changed query state from PENDING to READING
10:38:18.671719 5857 (net.c:555):Received header
0000 04 01 00 42 00 bc 01 00-                        |...B....|
10:38:18.671733 5857 (net.c:609):Received packet
0000 04 01 00 42 00 bc 01 00-81 01 00 00 00 09 00 22 |...B.... ......."|
0010 00 10 00 00 08 00 50 00-4c 00 4f 00 54 00 48 00 |......P. L.O.T.H.|
0020 45 00 41 00 44 00 08 43-00 4f 00 4e 00 54 00 45 |E.A.D..C .O.N.T.E|
0030 00 4e 00 54 00 53 00 d1-00 fd 10 00 c1 00 01 00 |.N.T.S.. ........|
0040 00 00                  -                        |..|

10:38:18.671760 5857 (token.c:555):processing result tokens.  marker is  
81(TDS7_RESULT)
10:38:18.671766 5857 (token.c:1515):processing TDS7 result metadata.
10:38:18.671773 5857 (mem.c:615):tds_free_all_results()
10:38:18.671780 5857 (token.c:1540):set current_results (1 column) to 
tds->res_info
10:38:18.671786 5857 (token.c:1547):setting up 1 columns
10:38:18.671796 5857 (token.c:1486):tds7_get_data_info:
                colname = CONTENTS (8 bytes)
                type = 34 (image)
                server's type = 34 (image)
                column_varint_size = 4
                column_size = 4096 (4096 on server)
10:38:18.671804 5857 (token.c:1556): name                 size/wsize      
type/wtype      utype
10:38:18.671811 5857 (token.c:1557): -------------------- --------------- 
--------------- -------
10:38:18.671817 5857 (token.c:1567): CONTENTS                4096/4096        
 34/34            0
10:38:18.671824 5857 (util.c:156):Changed query state from READING to PENDING
10:38:18.671831 5857 (dblib.c:4700):dbsqlok() found result token
10:38:18.671837 5857 (dblib.c:1668):dbresults(a74160)
10:38:18.671842 5857 (dblib.c:1674):dbresults: dbresults_state is 1 
(_DB_RES_RESULTSET_EMPTY)
10:38:18.671849 5857 (token.c:540):tds_process_tokens(a72e18, ffbdeb8c, 
ffbdeb88, 0x6914)
10:38:18.671855 5857 (util.c:156):Changed query state from PENDING to READING
10:38:18.671861 5857 (token.c:555):processing result tokens.  marker is  
d1(ROW)
10:38:18.671867 5857 (token.c:666):tds_process_tokens::SET_RETURN stopping on 
current token
10:38:18.671892 5857 (util.c:156):Changed query state from READING to PENDING
10:38:18.671899 5857 (dblib.c:1695):dbresults() tds_process_tokens returned 1 
(TDS_SUCCEED),
                                               result_type TDS_ROW_RESULT
10:38:18.671906 5857 (dblib.c:1657):dbresults returning 1 (SUCCEED)
10:38:18.671912 5857 (dblib.c:4063):dbcmdrow(a74160)
10:38:18.671918 5857 (dblib.c:3842):dbrows(a74160)
10:38:18.671925 5857 (dblib.c:2575):dbbind(a74160, 1, 1, 0, ffbdecf6)
10:38:18.671932 5857 (dblib.c:2812):dbwillconvert(SYBIMAGE, SYBCHAR)
10:38:18.671939 5857 (convert.c:2788):tds_willconvert(34, 47)
10:38:18.671947 5857 (convert.c:2792):tds_willconvert(34, 47) returns yes
10:38:18.671954 5857 (dblib.c:2018):dbnextrow(a74160)
10:38:18.671960 5857 (dblib.c:2031):dbnextrow() dbresults_state = 2 
(_DB_RES_RESULTSET_ROWS)
10:38:18.671967 5857 (token.c:540):tds_process_tokens(a72e18, ffbdeb9c, 0, 
0x1508)
10:38:18.671973 5857 (util.c:156):Changed query state from PENDING to READING
10:38:18.671979 5857 (token.c:555):processing result tokens.  marker is  
d1(ROW)
10:38:18.671985 5857 (token.c:2304):tds_process_row(): reading column 0
10:38:18.671992 5857 (token.c:2049):tds_get_data: type 34, varint size 4
10:38:18.671999 5857 (token.c:2110):tds_get_data(): wire column size is -1
10:38:18.672005 5857 (util.c:156):Changed query state from READING to PENDING
10:38:18.672012 5857 (buffering.h:306):buffer_transfer_bound_data(a74168 4040 
-1 a74160 0)
10:38:18.672019 5857 (dblib.c:548):dbgetnull(a74160, 1, -1, ffbdecf6)
10:38:18.672026 5857 (dblib.c:2100):leaving dbnextrow() returning 
REG_ROW/MORE_ROWS
10:38:18.672038 5857 (dblib.c:6374):dbtxptr(a74160, 1)
10:38:18.672050 5857 (dblib.c:6347):dbtxtimestamp(a74160, 1)
10:38:18.672060 5857 (dblib.c:6410):dbwritetext(a627c8, PLOTHEAD.CONTENTS, 
9d14cc, 16, 9d14dc, 1)
10:38:18.672068 5857 (dblib.c:2217):dbconvert(a627c8, SYBBINARY, 9d14cc, 16, 
SYBCHAR, ffbdebe0, -1)
10:38:18.672075 5857 (dblib.c:2349):dbconvert() calling tds_convert
10:38:18.672083 5857 (dblib.c:2352):dbconvert() called tds_convert returned 32
10:38:18.672089 5857 (dblib.c:2455):dbconvert() outputting 32 bytes character 
data destlen = -1
10:38:18.672096 5857 (dblib.c:2217):dbconvert(a627c8, SYBBINARY, 9d14dc, 8, 
SYBCHAR, ffbdebc8, -1)
10:38:18.672102 5857 (dblib.c:2349):dbconvert() calling tds_convert
10:38:18.672109 5857 (dblib.c:2352):dbconvert() called tds_convert returned 16
10:38:18.672115 5857 (dblib.c:2455):dbconvert() outputting 16 bytes character 
data destlen = -1
10:38:18.672153 5857 (mem.c:615):tds_free_all_results()
10:38:18.672161 5857 (util.c:156):Changed query state from IDLE to QUERYING
10:38:18.672167 5857 (write.c:140):tds_put_string converting 107 bytes of 
"writetext bulk PLOTHEAD.CONTENTS 0x00000000000000000000000000000000 
timestamp = 0x0000000000000000 with log"
10:38:18.672176 5857 (write.c:168):tds_put_string wrote 214 bytes
10:38:18.672182 5857 (util.c:156):Changed query state from QUERYING to PENDING
10:38:18.672189 5857 (net.c:741):Sending packet
0000 01 01 00 de 00 00 01 00-77 00 72 00 69 00 74 00 |........ w.r.i.t.|
0010 65 00 74 00 65 00 78 00-74 00 20 00 62 00 75 00 |e.t.e.x. t. .b.u.|
0020 6c 00 6b 00 20 00 50 00-4c 00 4f 00 54 00 48 00 |l.k. .P. L.O.T.H.|
0030 45 00 41 00 44 00 2e 00-43 00 4f 00 4e 00 54 00 |E.A.D... C.O.N.T.|
0040 45 00 4e 00 54 00 53 00-20 00 30 00 78 00 30 00 |E.N.T.S.  .0.x.0.|
0050 30 00 30 00 30 00 30 00-30 00 30 00 30 00 30 00 |0.0.0.0. 0.0.0.0.|
0060 30 00 30 00 30 00 30 00-30 00 30 00 30 00 30 00 |0.0.0.0. 0.0.0.0.|
0070 30 00 30 00 30 00 30 00-30 00 30 00 30 00 30 00 |0.0.0.0. 0.0.0.0.|
0080 30 00 30 00 30 00 30 00-30 00 30 00 30 00 20 00 |0.0.0.0. 0.0.0. .|
0090 74 00 69 00 6d 00 65 00-73 00 74 00 61 00 6d 00 |t.i.m.e. s.t.a.m.|
00a0 70 00 20 00 3d 00 20 00-30 00 78 00 30 00 30 00 |p. .=. . 0.x.0.0.|
00b0 30 00 30 00 30 00 30 00-30 00 30 00 30 00 30 00 |0.0.0.0. 0.0.0.0.|
00c0 30 00 30 00 30 00 30 00-30 00 30 00 20 00 77 00 |0.0.0.0. 0.0. .w.|
00d0 69 00 74 00 68 00 20 00-6c 00 6f 00 67 00       |i.t.h. . l.o.g.|

10:38:18.672283 5857 (token.c:540):tds_process_tokens(a631d8, ffbdeacc, 
ffbdeac8, 0x100)
10:38:18.672292 5857 (util.c:156):Changed query state from PENDING to READING
10:38:18.673186 5857 (net.c:555):Received header
0000 04 01 01 31 00 7a 01 00-                        |...1.z..|

10:38:18.673202 5857 (net.c:609):Received packet
0000 04 01 01 31 00 7a 01 00-aa ba 00 d3 1b 00 00 01 |...1.z.. ........|
0010 10 4f 00 49 00 6e 00 76-00 61 00 6c 00 69 00 64 |.O.I.n.v .a.l.i.d|
0020 00 20 00 74 00 65 00 78-00 74 00 2c 00 20 00 6e |. .t.e.x .t.,. .n|
0030 00 74 00 65 00 78 00 74-00 2c 00 20 00 6f 00 72 |.t.e.x.t .,. .o.r|
0040 00 20 00 69 00 6d 00 61-00 67 00 65 00 20 00 70 |. .i.m.a .g.e. .p|
0050 00 6f 00 69 00 6e 00 74-00 65 00 72 00 20 00 76 |.o.i.n.t .e.r. .v|
0060 00 61 00 6c 00 75 00 65-00 20 00 30 00 78 00 30 |.a.l.u.e . .0.x.0|
0070 00 30 00 30 00 30 00 30-00 30 00 30 00 30 00 30 |.0.0.0.0 .0.0.0.0|
0080 00 30 00 30 00 30 00 30-00 30 00 30 00 30 00 30 |.0.0.0.0 .0.0.0.0|
0090 00 30 00 30 00 30 00 30-00 30 00 30 00 30 00 30 |.0.0.0.0 .0.0.0.0|
00a0 00 30 00 30 00 30 00 30-00 30 00 30 00 30 00 2e |.0.0.0.0 .0.0.0..|
00b0 00 08 44 00 42 00 53 00-51 00 4c 00 54 00 30 00 |..D.B.S. Q.L.T.0.|
00c0 34 00 00 01 00 ab 60 00-25 0e 00 00 00 00 22 00 |4.....`. %.....".|
00d0 54 00 68 00 65 00 20 00-73 00 74 00 61 00 74 00 |T.h.e. . s.t.a.t.|
00e0 65 00 6d 00 65 00 6e 00-74 00 20 00 68 00 61 00 |e.m.e.n. t. .h.a.|
00f0 73 00 20 00 62 00 65 00-65 00 6e 00 20 00 74 00 |s. .b.e. e.n. .t.|
0100 65 00 72 00 6d 00 69 00-6e 00 61 00 74 00 65 00 |e.r.m.i. n.a.t.e.|
0110 64 00 2e 00 08 44 00 42-00 53 00 51 00 4c 00 54 |d....D.B .S.Q.L.T|
0120 00 30 00 34 00 00 01 00-fd 02 00 fd 00 00 00 00 |.0.4.... ........|
0130 00                     -                        |.|

10:38:18.673299 5857 (token.c:555):processing result tokens.  marker is  
aa(ERROR)
10:38:18.673305 5857 (token.c:122):tds_process_default_tokens() marker is 
aa(ERROR)
10:38:18.673311 5857 (token.c:2588):tds_process_msg() reading message 7123 
from server
10:38:18.673322 5857 (token.c:2661):tds_process_msg() calling client msg 
handler
10:38:18.673328 5857 (dbutil.c:85):_dblib_handle_info_message(a37b60, a631d8, 
ffbde8f8)
10:38:18.673334 5857 (dbutil.c:86):msgno 7123: "Invalid text, ntext, or image 
pointer value 0x00000000000000000000000000000000."


Regards
Trygve Liland