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PIC S9 (9) COMP INTEGER*4 COMP-1 COMP-2 PIC S9 (p-s) V9(s) COMP-3 PIC X (n) Req. conv. PIC X (l) Req. conv.

5 4 4 2

REAL*4 REAL*8 REAL*8

2/15/2005

Notes: 1 Host language does not support packed decimal data; conversion to or from floating point data may cause truncation or round-off errors.

The SQL standard specifies a C string with a null terminator; older DBMS implementations returned a separate length value in a data structure. The length of the host character string (l) is the number of bits (n), divided by the bits-per-character for the host language (typically 8), rounded up. Host language does not support variable-length strings; most DBMS brands will convert to fixed-length strings. Host languages do not support native date/time data types; requires conversion to/from host language character string data types with text date, time, and interval representations.

Table 3-1

Table 17-1.

I A positive indicator value means that the host variable contains a valid value, which may have been rounded off or truncated. This situation occurs only when data is retrieved from the database, and is described later in the section Retrieving NULL Values.

PG-13

begin declare section; hostvar1 = 106; *hostvar2 = "Joe Smith"; hostvar3 = 150000.00; *hostvar4 = "01-JUN-1990"; end declare section;

exec sql update salesreps set manager = :hostvar1 where empl_num = 102; exec sql update salesreps set name = :hostvar2 where empl_num = 102: exec sql update salesreps set quota = :hostvar3 where empl_num = 102; exec sql update salesreps set hire_date = :hostvar4 where empl_num = 102; . . .

Figure 17-18.

2/15/2005

When you specify a host variable in an embedded SQL statement, you can follow it immediately with the name of the corresponding indicator variable. Both variable names are preceded by a colon. Here is an embedded UPDATE statement that uses the host variable amount with the companion indicator variable amount_ind:

exec sql update salesreps set quota = :amount :amount_ind, sales = :amount2 where quota < 20000.00;

January 21 February 21 March 21 April 21 May 21 June 21 July 21 August 21 September 21 October 21 November 21 8 in. 22 in. 40 in. 58 in. 72 in. 80 in. 72 in. 58 in. 40 in. 22 in. 8 in. 2 in. 20 cm 55 cm 100 cm 145 cm 195 cm 200 cm 195 cm 145 cm 100 cm 55 cm 20 cm 5 cm from floor from floor from floor from floor from floor from floor from floor from floor from floor from floor from floor from floor

17:

If amount_ind has a nonnegative value when the UPDATE statement is executed, the DBMS treats the statement as if it read:

Figure 1-5

exec sql update salesreps set quota = :amount, sales = :amount2 where quota < 20000.00;

If amount_ind has a negative value when the UPDATE statement is executed, the DBMS treats the statement as if it read:

exec sql update salesreps set quota = NULL, sales = :amount2 where quota < 20000.00;

A host variable/indicator variable pair can appear in the assignment clause of an embedded UPDATE statement (as shown here) or in the values clause of an embedded INSERT statement. You cannot use an indicator variable in a search condition, so this embedded SQL statement is illegal:

The Movie ID was copied from Movie (the original relation) to Movie Language (the new relation). The Lang. Code multivalued attribute was moved from the Movie relation to the Movie Language relation as the Language Code attribute. (The abbreviated attribute names in Figure 1-4 were for the purposes of illustration it is always best to abbreviate only when absolutely necessary.) The unique identi er of the Movie Language relation is the combination of Movie ID and Language Code, which amounts to all of the attributes in the relation. Neither Movie nor Movie Language in Figure 1-5 has repeating groups or multivalued attributes, so both relations are in rst normal form.

exec sql delete from salesreps where quota = :amount :amount_ind;

These measurements are assuming a measurement of 87 in. between the center of the heliodon table and the light source