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getShort
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Because everybody except Oracle stores a SMALLINT as a 16-bit (short) signed integer, impedance should be nil But there is a technical hitch: The number -32768 is legal according to Java but not according to ANSI Similar hitches apply for all the integer data types Not to worry: Most DBMSs ignore this detail Only Informix forbids you to store -32768 in a SMALLINT
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getByte
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The TINYINT data type is not standard SQL, and there could be a difficulty if it's an unsigned (range 0 to +255) byte rather than a signed (range -128 to +127) byte Avoid negative TINYINTs
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getDate
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Drivers using the JDBC-ODBC bridge are usually slow to convert DATE/TIME/TIMESTAMP columns because of a change in the rather confusing manner with which temporal data types are numbered The matter is trivial as long as these data types are relatively little used
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getBoolean
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Table 13-6 says this is appropriate for the BIT data type, but it's important to know that this means the ODBC BIT type, which is utterly different from the SQL Standard BIT It has been found that the SQL Standard BOOLEAN data type is troublesome, particularly with PL/SQL stored procedures You can save a little bit of time with getXXX methods by following these suggestions
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Close
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When you're done with a result set, it must be closed else other transactions will be blocked The explicit method call is:
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rsclose();
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You can skip rsclose() if the result set is closed automatically A result set is closed automatically in these cases:
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When COMMIT or ROLLBACK or DISCONNECT happens When a new "execute" method call happens on the same Statement object, or a retrieval occurs on the next result set for the same Statement[3]
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Note that you cannot rely on this "auto close" in analogous ODBC situations
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In rare cases, with some DBMSs only, when UPDATE WHERE CURRENT OF <cursor> or DELETE WHERE CURRENT OF <cursor> are executed Note: The definition of "automatic COMMIT" depends on the definition of "automatic close" so add these rules to what you need to memorize
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Why would you want to close early
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Because there are other Statements, and they either need resources or they use the rows in the result set (wasting time with sensitive cursors, etc) Because there are other users, and you're unwilling to block them any longer
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Why would you want not to explicitly close
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Because message passing is reduced if you let closing happen automatically
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We did a few tests on skipping rsclose() when we knew the result set should be closed automatically Skipping made no significant difference But we were using a fairly intelligent driver, and we know that other drivers would not be so intelligent
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The Bottom Line: Result Sets
To find out how big a result set is, try:
int i = executeUpdate();
Or, if you have a scroll cursor, try scrolling from back to front When all else fails, resort to SELECT
COUNT(*)
JDBC versus ODBC
There are many similarities between JDBC and ODBC, partly because both follow X/Open standards, and partly because the makers of JDBC were able to learn from the ODBC experience when they started designing We have observed a few times in this chapter that such-and-such a JDBC method "does the same thing as" such-and-such an ODBC function right down to use of the same field names or constant values The differences can usually be attributable to exigencies of the language for example, ODBC uses pointers a lot whereas JDBC has provisions for objects We do see a tendency in JDBC to have several functions where ODBC has only one For example, one ODBC function for "how NULLs sort" returns four mutually exclusive values Meanwhile, JDBC requires four functions for "how NULLs sort"; all return true/false We also see that JDBC is lacking in some functionality that ODBC possesses There are two noticeable areas:
In ODBC, there is a thoroughly defined hierarchy:
env > dbc > stmt > desc
(see Figure 12-1 in 12, "ODBC") In JDBC, there is only: