Embedded SQL

/* Embedded SQL example: Query employee records using cursor */
EXEC SQL INCLUDE SQLCA;

EXEC SQL BEGIN DECLARE SECTION;
    char emp_name[50];
    int  emp_id;
    double salary;
    char db_name[30] = "testdb";
EXEC SQL END DECLARE SECTION;

#include <stdio.h>

int main() {
    EXEC SQL CONNECT TO :db_name;
    if (sqlca.sqlcode != 0) {
        fprintf(stderr, "Connect failed: %ld\n", sqlca.sqlcode);
        return 1;
    }

    EXEC SQL DECLARE emp_cursor CURSOR FOR
        SELECT emp_id, emp_name, salary
        FROM employees
        WHERE salary > 50000
        ORDER BY salary DESC;

    EXEC SQL OPEN emp_cursor;

    printf("%-6s  %-30s  %12s\n", "ID", "Name", "Salary");
    printf("%-6s  %-30s  %12s\n", "------", "------------------------------", "------------");

    for (;;) {
        EXEC SQL FETCH emp_cursor INTO :emp_id, :emp_name, :salary;
        if (sqlca.sqlcode != 0) break;
        printf("%-6d  %-30s  %12.2f\n", emp_id, emp_name, salary);
    }

    EXEC SQL CLOSE emp_cursor;
    EXEC SQL COMMIT;
    EXEC SQL DISCONNECT;
    return 0;
}