/****************************************************************************
** (c) Copyright IBM Corp. 2007 All rights reserved.
** 
** The following sample of source code ("Sample") is owned by International 
** Business Machines Corporation or one of its subsidiaries ("IBM") and is 
** copyrighted and licensed, not sold. You may use, copy, modify, and 
** distribute the Sample in any form without payment to IBM, for the purpose of 
** assisting you in the development of your applications.
** 
** The Sample code is provided to you on an "AS IS" basis, without warranty of 
** any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR 
** IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do 
** not allow for the exclusion or limitation of implied warranties, so the above 
** limitations or exclusions may not apply to you. IBM shall not be liable for 
** any damages you suffer as a result of using, copying, modifying or 
** distributing the Sample, even if IBM has been advised of the possibility of 
** such damages.
*****************************************************************************
**
** SOURCE FILE NAME: tbinfo.sqc
**
** SAMPLE: How to get information at the table level
**
** SQL STATEMENTS USED:
**         SELECT
**         DECLARE CURSOR
**         OPEN
**         FETCH
**         CLOSE
**
**                           
*****************************************************************************
**
** For more information on the sample programs, see the README file.
**
** For information on developing C applications, see the Application
** Development Guide.
**
** For information on using SQL statements, see the SQL Reference.
**
** For the latest information on programming, building, and running DB2 
** applications, visit the DB2 Information Center: 
**     http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp
****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlenv.h>
#include <sqlutil.h>
#include "utilemb.h"

int TbSchemaNameGet(void);
int TbColumnInfoGet(void);

EXEC SQL BEGIN DECLARE SECTION;
  char tableName[128];
  char schemaName[128];
  char columnName[20];
  char dataType[14];
  sqlint32 dataLength;
  short dataScale;
EXEC SQL END DECLARE SECTION;

int main(int argc, char *argv[])
{
  int rc = 0;
  char dbAlias[SQL_ALIAS_SZ + 1];
  char user[USERID_SZ + 1];
  char pswd[PSWD_SZ + 1];

  /* check the command line arguments */
  rc = CmdLineArgsCheck1(argc, argv, dbAlias, user, pswd);
  if (rc != 0)
  {
    return rc;
  }

  printf("\nTHIS SAMPLE SHOWS HOW TO GET INFORMATION AT THE TABLE LEVEL.\n");

  /* connect to the database */
  rc = DbConn(dbAlias, user, pswd);
  if (rc != 0)
  {
    return rc;
  }

  strcpy(tableName, "STAFF");

  rc = TbSchemaNameGet();
  rc = TbColumnInfoGet();

  /* disconnect from the database */
  rc = DbDisconn(dbAlias);
  if (rc != 0)
  {
    return rc;
  }

  return 0;
} /* end main */

int TbSchemaNameGet(void)
{
  struct sqlca sqlca;

  printf("\n-----------------------------------------------------------");
  printf("\nUSE THE SQL STATEMENT:\n");
  printf("  SELECT INTO\n");
  printf("TO GET A TABLE SCHEMA NAME.\n");

  /* get the table schema name */
  printf("\n  Execute the statement\n");
  printf("    SELECT tabschema INTO :schemaName\n");
  printf("      FROM syscat.tables\n");
  printf("      WHERE tabname = :tableName\n");
  printf("  for\n");
  printf("    tableName = '%s'.\n", tableName);

  EXEC SQL SELECT tabschema INTO :schemaName
    FROM syscat.tables
    WHERE tabname = :tableName;
  EMB_SQL_CHECK("Table schema name -- Get");

  /* get rid of spaces from the end of schemaName */
  strtok(schemaName, " ");

  printf("\n  Table schema name is: %s\n", schemaName);

  return 0;
} /* TbSchemaNameGet */

int TbColumnInfoGet(void)
{
  struct sqlca sqlca;

  printf("\n-----------------------------------------------------------");
  printf("\nUSE THE SQL STATEMENTS:\n");
  printf("  DECLARE CURSOR\n");
  printf("  OPEN\n");
  printf("  FETCH\n");
  printf("  CLOSE\n");
  printf("TO GET TABLE COLUMN INFO.\n");

  /* get info for table columns */
  printf("\n  Get info for '%s.%s' table columns:\n",
         schemaName, tableName);
  printf("\n    column name          data type      data size\n");
  printf("    -------------------- -------------- ----------\n");

  EXEC SQL DECLARE c1 CURSOR FOR
    SELECT colname, typename, length, scale
      FROM syscat.columns
      WHERE tabschema = :schemaName AND tabname = :tableName;

  EXEC SQL OPEN c1;
  EMB_SQL_CHECK("Cursor -- Open");

  EXEC SQL FETCH c1 INTO :columnName, :dataType, :dataLength, :dataScale;
  EMB_SQL_CHECK("Cursor -- Fetch");

  if (sqlca.sqlcode == 100)
  {
    printf("\n  Data not found.\n");
  }

  while (sqlca.sqlcode != 100)
  {
    printf("    %-20.20s %-14.14s %d", columnName, dataType, dataLength);
    if (dataScale != 0)
    {
      printf(",%d\n", dataScale);
    }
    else
    {
      printf("\n");
    }

    EXEC SQL FETCH c1 INTO :columnName, :dataType, :dataLength, :dataScale;
    EMB_SQL_CHECK("Cursor -- Fetch");
  }

  EXEC SQL CLOSE c1;
  EMB_SQL_CHECK("Cursor -- Close");

  return 0;
} /* TbColumnInfoGet */