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Querying the Result Set

Updated on 2024-05-07 GMT+08:00
  • The SELECT statement that returns the result of a single row can be directly executed using EXEC SQL. For details, see Running SQL Commands.

    Example:

    /* Create a table and insert data. */
    EXEC SQL CREATE TABLE test_table (number1 integer, number2 integer);
    EXEC SQL INSERT INTO test_table (number1, number2) VALUES (2, 1);
    
    /* The query result is in a single row. :num is the host variable. */
    EXEC SQL SELECT number1 INTO :num FROM test_table WHERE number2 = 1;
  • To process a multi-row result set, you must use a cursor. For details, see Using Cursors. (In special cases, an application can fetch multiple rows of results at a time and write them to the host variable of the array type. For details, see Host Variables with Non-Primitive Types.)
    Example:
        /* Create a table and insert data. */
        EXEC SQL CREATE TABLE test_table (number1 integer, number2 integer);
        EXEC SQL INSERT INTO test_table (number1, number2) VALUES (2, 1);
        EXEC SQL INSERT INTO test_table (number1, number2) VALUES (3, 1);
        EXEC SQL INSERT INTO test_table (number1, number2) VALUES (4, 1);
        EXEC SQL INSERT INTO test_table (number1, number2) VALUES (5, 1);
    
    /* Define the host variable. */
    EXEC SQL BEGIN DECLARE SECTION;
        int v1;
        int v2;
    EXEC SQL END DECLARE SECTION;
    
        /* Declare a cursor. */
        EXEC SQL DECLARE test_bar CURSOR FOR SELECT number1, number2 FROM test_table ORDER BY number1;
        /* Open the cursor. */
        EXEC SQL OPEN test_bar;
        /* When the cursor reaches the end of the result set, exit the loop. */
        EXEC SQL WHENEVER NOT FOUND DO BREAK;
        /* Obtain the query result set. */
        while(1)
        {
            EXEC SQL FETCH NEXT FROM test_bar INTO :v1, :v2;
            printf("number1 = %d, number2 = %d\n",v1,v2);
        }
        /* Close the cursor. */
        EXEC SQL CLOSE test_bar;

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