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

src/interfaces/odbc/info.c

@@ -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];

src/interfaces/odbc/psqlodbc.h

@@ -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 */

src/interfaces/odbc/statement.h

@@ -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 */
 
 };