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Further to the previous ODBC patches I posted today, I found a couple of 

problems with char array sizes having set a couple of constants to 0 for
unlimited query length and row length. This additional patch cleans those
problems up by defining a new constant (STD_STATEMENT_LEN) to 65536 and
using that in place of MAX_STATEMENT_LEN.

Another constant (MAX_MESSAGE_LEN) was defined as 2*BLCKSZ, but is now
65536. This is used to define the length of the message buffer in a number
of places and as I understand it (probably not that well!) therefore also
places a limit on the query length. Fixing this properly is beyond my
capabilities but 65536 should hopefully be large enough for most people.

Apologies for being over-enthusiastic and posting 3 patches in one day
rather than 1 better tested one!

Regards,

Dave Page
This commit is contained in:
Bruce Momjian 2001-01-25 03:28:27 +00:00
parent 0e968ee705
commit 40203e4f3e
3 changed files with 15 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/interfaces/odbc/info.c
View File

@ -350,7 +350,7 @@ RETCODE result;
case SQL_MAX_STATEMENT_LEN: /* ODBC 2.0 */
/* maybe this should be 0? */
len = 4;
value = MAX_QUERY_SIZE;
value = MAX_STATEMENT_LEN;
break;
case SQL_MAX_TABLE_NAME_LEN: /* ODBC 1.0 */
@ -916,7 +916,7 @@ TupleNode *row;
HSTMT htbl_stmt;
RETCODE result;
char *tableType;
char tables_query[MAX_STATEMENT_LEN];
char tables_query[STD_STATEMENT_LEN];
char table_name[MAX_INFO_STRING], table_owner[MAX_INFO_STRING], relhasrules[MAX_INFO_STRING];
ConnInfo *ci;
char *prefix[32], prefixes[MEDIUM_REGISTRY_LEN];
@ -1186,7 +1186,7 @@ StatementClass *stmt = (StatementClass *) hstmt;
TupleNode *row;
HSTMT hcol_stmt;
StatementClass *col_stmt;
char columns_query[MAX_STATEMENT_LEN];
char columns_query[STD_STATEMENT_LEN];
RETCODE result;
char table_owner[MAX_INFO_STRING], table_name[MAX_INFO_STRING], field_name[MAX_INFO_STRING], field_type_name[MAX_INFO_STRING];
Int2 field_number, result_cols, scale;
@ -1583,7 +1583,7 @@ StatementClass *stmt = (StatementClass *) hstmt;
ConnInfo *ci;
HSTMT hcol_stmt;
StatementClass *col_stmt;
char columns_query[MAX_STATEMENT_LEN];
char columns_query[STD_STATEMENT_LEN];
RETCODE result;
char relhasrules[MAX_INFO_STRING];
@ -1719,7 +1719,7 @@ RETCODE SQL_API SQLStatistics(
{
static char *func="SQLStatistics";
StatementClass *stmt = (StatementClass *) hstmt;
char index_query[MAX_STATEMENT_LEN];
char index_query[STD_STATEMENT_LEN];
HSTMT hindx_stmt;
RETCODE result;
char *table_name;
@ -2095,7 +2095,7 @@ RETCODE result;
int seq = 0;
HSTMT htbl_stmt;
StatementClass *tbl_stmt;
char tables_query[MAX_STATEMENT_LEN];
char tables_query[STD_STATEMENT_LEN];
char attname[MAX_INFO_STRING];
SDWORD attname_len;
char pktab[MAX_TABLE_LEN + 1];
@ -2262,7 +2262,7 @@ TupleNode *row;
HSTMT htbl_stmt, hpkey_stmt;
StatementClass *tbl_stmt;
RETCODE result, keyresult;
char tables_query[MAX_STATEMENT_LEN];
char tables_query[STD_STATEMENT_LEN];
char trig_deferrable[2];
char trig_initdeferred[2];
char trig_args[1024];

11
src/interfaces/odbc/psqlodbc.h
View File

@ -54,9 +54,8 @@ typedef UInt4 Oid;
#define BLCKSZ 4096
#endif
#define MAX_ROW_SIZE 0 /* Unlimited rowsize with the Tuple Toaster */
#define MAX_QUERY_SIZE 0 /* Unlimited query length from v7.0(?) */
#define MAX_MESSAGE_LEN (2*BLCKSZ)
#define MAX_MESSAGE_LEN 65536 /* This puts a limit on query size but I don't */
/* see an easy way round this - DJP 24-1-2001 */
#define MAX_CONNECT_STRING 4096
#define ERROR_MSG_LENGTH 4096
#define FETCH_MAX 100 /* default number of rows to cache for declare/fetch */
@ -85,8 +84,12 @@ typedef UInt4 Oid;
#define MAX_INFO_STRING 128
#define MAX_KEYPARTS 20
#define MAX_KEYLEN 512 /* max key of the form "date+outlet+invoice" */
#define MAX_STATEMENT_LEN MAX_MESSAGE_LEN
#define MAX_ROW_SIZE 0 /* Unlimited rowsize with the Tuple Toaster */
#define MAX_STATEMENT_LEN 0 /* Unlimited statement size with 7.0
/* Previously, numerous query strings were defined of length MAX_STATEMENT_LEN */
/* Now that's 0, lets use this instead. DJP 24-1-2001 */
#define STD_STATEMENT_LEN MAX_MESSAGE_LEN
#define PG62 "6.2" /* "Protocol" key setting to force Postgres 6.2 */
#define PG63 "6.3" /* "Protocol" key setting to force postgres 6.3 */

2
src/interfaces/odbc/statement.h
View File

@ -184,7 +184,7 @@ struct StatementClass_ {
char cursor_name[MAX_CURSOR_LEN+1];
char stmt_with_params[65536 /* MAX_STATEMENT_LEN */]; /* statement after parameter substitution */
char stmt_with_params[STD_STATEMENT_LEN]; /* statement after parameter substitution */
};