As illustrated in the following table, this example uses three tables, named ORDERS, LINES, and CUSTOMERS.
In the ORDERS table, CUSTID identifies the customer to whom the sale has been made. It is a foreign key that refers to CUSTID in the CUSTOMERS table.
In the LINES table, ORDERID identifies the sales order with which the line item is associated. It is a foreign key that refers to ORDERID in the ORDERS table.
#define TAB_LEN SQL_MAX_TABLE_NAME_LEN + 1
#define COL_LEN SQL_MAX_COLUMN_NAME_LEN + 1
LPSTR szTable; /* Table to display */
UCHAR szPkTable[TAB_LEN]; /* Primary key table name */
UCHAR szFkTable[TAB_LEN]; /* Foreign key table name */
UCHAR szPkCol[COL_LEN]; /* Primary key column */
UCHAR szFkCol[COL_LEN]; /* Foreign key column */
SQLHSTMT hstmt;
SQLINTEGER cbPkTable, cbPkCol, cbFkTable, cbFkCol, cbKeySeq;
SQLSMALLINT iKeySeq;
SQLRETURN retcode;
// Bind the columns that describe the primary and foreign keys.
// Ignore the table schema, name, and catalog for this example.
SQLBindCol(hstmt, 3, SQL_C_CHAR, szPkTable, TAB_LEN, &cbPkTable);
SQLBindCol(hstmt, 4, SQL_C_CHAR, szPkCol, COL_LEN, &cbPkCol);
SQLBindCol(hstmt, 5, SQL_C_SSHORT, &iKeySeq, TAB_LEN, &cbKeySeq);
SQLBindCol(hstmt, 7, SQL_C_CHAR, szFkTable, TAB_LEN, &cbFkTable);
SQLBindCol(hstmt, 8, SQL_C_CHAR, szFkCol, COL_LEN, &cbFkCol);
strcpy_s(szTable, sizeof(szTable), "ORDERS");
/* Get the names of the columns in the primary key. */
retcode = SQLPrimaryKeys(hstmt,
NULL, 0, /* Catalog name */
NULL, 0, /* Schema name */
szTable, SQL_NTS); /* Table name */
while ((retcode == SQL_SUCCESS) || (retcode == SQL SUCCESS_WITH_INFO)) {
/* Fetch and display the result set. This will be a list of the */
/* columns in the primary key of the ORDERS table. */
retcode = SQLFetch(hstmt);
if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
fprintf(out, "Table: %s Column: %s Key Seq: %hd \n", szPkTable, szPkCol,
iKeySeq);
}
/* Close the cursor (the hstmt is still allocated). */
SQLFreeStmt(hstmt, SQL_CLOSE);
/* Get all the foreign keys that refer to ORDERS primary key.*/
retcode = SQLForeignKeys(hstmt,
NULL, 0, /* Primary catalog */
NULL, 0, /* Primary schema */
szTable, SQL_NTS, /* Primary table */
NULL, 0, /* Foreign catalog */
NULL, 0, /* Foreign schema */
NULL, 0); /* Foreign table */
while ((retcode == SQL_SUCCESS) || (retcode == SQL_SUCCESS_WITH_INFO)) {
/* Fetch and display the result set. This will be all of the */
/* foreign keys in other tables that refer to the ORDERS */
/* primary key. */
retcode = SQLFetch(hstmt);
if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
fprintf(out, "%-s ( %-s ) <-- %-s ( %-s )\n", szPkTable,
szPkCol, szFkTable, szFkCol);
}
/* Close the cursor (the hstmt is still allocated). */
SQLFreeStmt(hstmt, SQL_CLOSE);
/* Get all the foreign keys in the ORDERS table. */
retcode = SQLForeignKeys(hstmt,
NULL, 0, /* Primary catalog */
NULL, 0, /* Primary schema */
NULL, 0, /* Primary table */
NULL, 0, /* Foreign catalog */
NULL, 0, /* Foreign schema */
szTable, SQL_NTS); /* Foreign table */
while ((retcode == SQL_SUCCESS) || (retcode == SQL_SUCCESS_WITH_INFO)) {
/* Fetch and display the result set. This will be all of the */
/* primary keys in other tables that are referred to by foreign */
/* keys in the ORDERS table. */
retcode = SQLFetch(hstmt);
if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
fprintf(out, "%-s ( %-s )--> %-s ( %-s )\n", szFkTable, szFkCol, szPkTable, szPkCol);
}
/* Free the hstmt. */
SQLFreeStmt(hstmt, SQL_DROP);