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"EXEC SQL DESCRIBE SELECT LIST" returns "Specified partition does not exist"

P: n/a
Jan
I store sql-commands in a database table. In the first step I get the
sql command out of the database table with embedded sql. In the second
step I try to execute the command, which i got from the database
table, using dynamic sql.

Executing 'EXEC SQL DESCRIBE SELECT LIST FOR S INTO select_dp;' the
error code -2149 is returned That means "Specified partition does not
exist".

Does anybody know if it is a database problem or a problem of
precompilation?

I use the follwing arguments for precompilation:
PARSE=NONE VARCHAR=YES CODE=CPP FIPS=YES MODE=ANSI LINES=YES
OBJECTS=NO
PROGRAM till DECSCRIPE SELECT LIST:

/* getting the command from the database with embedded SQL
* and executing the command with dynamic SQL */
QtStringData*
DBCatalogAccess::execCommand(const char* command) throw (r_Error)
{
const int alias_len = db->alias_len;
const int description_len = 255;

/* Maximum length of dynamic sql statement.
It must be the same as len(dyn_statement) */
const int sql_com_len = 1024;

/* Definitons for dynamic sql*/
/* Maximum number of select-list items or bind variables. */
const int max_items = 40;

/* Maximum lengths of the _names_ of the select-list items
or indicator variables */
const int max_vname_len = 30;
const int max_iname_len = 30;

/* Define NULL */
const int nul = 0;

//Declaration need to fetch the command
EXEC SQL BEGIN DECLARE SECTION;
// Define a host structure for the output values
// of a SELECT statement
struct comdat {
char alias[20]; //alias_len
char describtion[255]; //desciption_len
char sql_com[255]; //sql_com_len
} comStruct;
// Input host variables
char *comInput;
EXEC SQL END DECLARE SECTION;
comInput = (char*) malloc(strlen(command));
strncpy(comInput, command, strlen(command));

cout << "DBCatalogAccess::execCommand:Entered command name: " <<
command << endl << endl;
//getting the command
EXEC SQL SELECT alias, description, sqlcommand
INTO
:comStruct
FROM CATQUERY
WHERE ALIAS=:comInput;
//t->commit();
cout << "Neues 1 " << endl;
cout << "Errorcode: " << SQLCODE << endl;
// termnating if an error accures
if (SQLCODE!=0)
{
//Fehler-Code muss noch an Anwender weitergeleitet werden.
char* ret = itoa(SQLCODE);

return (new QtStringData
("ORACLE ERROR; Modul: reladmin; Class: DBCatalogAccess;
Function: execCommand;"));
}
//Aufrufen des SQL-Befehls
cout << "dbcatalogaccess.pc::execCommand:alias " << comStruct.alias
<< endl;
/************************************************** *********************************
*Starting with dynamic sql
************************************************** *********************************/
EXEC SQL INCLUDE sqlda;
EXEC SQL INCLUDE sqlca;

EXEC SQL BEGIN DECLARE SECTION;
char dyn_statement[1024];
EXEC SQL VAR dyn_statement IS STRING(1024);
EXEC SQL END DECLARE SECTION;

SQLDA *bind_dp;
SQLDA *select_dp;

/* Define a buffer to hold longjmp state info. */
jmp_buf jmp_continue;

/* A global flag for hte error routine */
int parse_flag = 0;

cout << "DBCatalog::execCommand:Allocating descriptors" << endl;
/* Allocate memory for the select an bind descriptors. */
if ((bind_dp = sqlaldt(SQL_SINGLE_RCTX, max_items, max_vname_len,
max_iname_len)) == (SQLDA *) 0)
return (new QtStringData("DBCatalogAccess::execCommand:Fehler beim
Speicherallocieren für bind_dp"));

if ((select_dp = sqlaldt(SQL_SINGLE_RCTX, max_items , max_vname_len,
max_iname_len)) == (SQLDA *) 0)
return (new QtStringData("DBCatalogAccess::execCommand:Fehler beim
Speicherallocieren für select_dp"));
select_dp->N = max_items;

/* Allocate the pointers to the indicator variables and the actual
data. */
int i;
for(i = 0; i < max_items; i++)
{
bind_dp->I[i] = (short *) malloc(sizeof(short));
select_dp->I[i] = (short *) malloc(sizeof(short));
bind_dp->V[i] = (char *) malloc(1);
select_dp->V[i] = (char *) malloc(1);
}

/* setting dynamic statement */
//dyn_statement = (char*) malloc(strlen(comStruct.sql_com));
cout << "SQL-statement: " << comStruct.sql_com << endl;
strncpy(dyn_statement, comStruct.sql_com,
strlen(comStruct.sql_com));

/* Prepare the statement und declare the cursor */
EXEC SQL PREPARE S FROM :dyn_statement;
EXEC SQL DECLARE C CURSOR FOR S;

/* Set the bind variables for any placeholders in the SQL statement.
*/
bind_dp->N = max_items;
EXEC SQL DESCRIBE BIND VARIABLES FOR S INTO bind_dp;
cout << "DESCRIBE BIND VARIABLES; ErrorCode: " << SQLCODE << endl;
/* Set the maximum number fo array elements in the descriptor to the
number found. */
bind_dp->N = bind_dp->F;

/* Get the value of each bind variable as a ...
* C[i] contains the length of the bind variable name used in the
SQL statement.
* S[i] contains the actual name of the bind variable used in the
SQL statement.
* L[i] will contain the length of the data value entered.
* V[i] will contain the address of the data value entered.
* T[i] is always set to 1 because in this program data values for
all bind
* variables are stored as strings in the database.
* I[i] will point to the indicator value, which is set to -1 when
the bind variable value is "null".
*/
if (bind_dp->F > 0)
{
cout << "Bind variable found. Setting bind variable...";

cout << "OK!" << endl;
}
else
{
cout << "No bind variable found" << endl;
}

EXEC SQL OPEN C USING DESCRIPTOR bind_dp;

/* Set the select list items (output variables) in the select list*/
select_dp->N = max_items;

EXEC SQL DESCRIBE SELECT LIST FOR S INTO select_dp;
cout << "DESCRIBE SELECT LIST; ErrorCode: " << SQLCODE << endl;
Jul 19 '05 #1
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