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CHAPTER 9 WORKING WITH DATE, TIME, AND TIMESTAMP IN JDBC
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TIME_COL DATE_COL DATE_TIME --------- --------- --------01-JUL-05 01-JUL-05 01-JUL-05 SQL> commit; Commit complete.
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This shows the solution: import java.sql.*; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class TestNormalization { public static void main(String args[]) { String GET_RECORDS = "select time_col, date_col, date_time_col from date_time_table"; ResultSet rs = null; Connection conn = null; Statement stmt = null; try { String dbVendor = args[0]; // {"mysql", "oracle" } conn = VeryBasicConnectionManager.getConnection(dbVendor); System.out.println("conn="+conn); stmt = conn.createStatement(); rs = stmt.executeQuery(GET_RECORDS); while (rs.next()) { java.sql.Time dbSqlTime = rs.getTime(1); java.sql.Date dbSqlDate = rs.getDate(2); java.sql.Timestamp dbSqlTimestamp = rs.getTimestamp(3); System.out.println("dbSqlTime="+dbSqlTime); System.out.println("dbSqlDate="+dbSqlDate); System.out.println("dbSqlTimestamp="+dbSqlTimestamp); System.out.println("-- check for Normalization --"); java.util.Date dbSqlTimeConverted = new java.util.Date(dbSqlTime.getTime()); java.util.Date dbSqlDateConverted = new java.util.Date(dbSqlDate.getTime()); System.out.println("dbSqlTimeConverted="+dbSqlTimeConverted); System.out.println("dbSqlDateConverted="+dbSqlDateConverted); } } catch( Exception e ) { e.printStackTrace(); System.out.println("Failed to get the records."); System.exit(1); } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } } }
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CHAPTER 9 WORKING WITH DATE, TIME, AND TIMESTAMP IN JDBC
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As you can see from the following results, the MySQL driver does support normalization for the java.sql.Date and java.sql.Time objects: $ javac TestNormalization.java $ java TestNormalization mysql ok: loaded mysql driver. conn=com.mysql.jdbc.Connection@1e4cbc4 dbSqlTime=10:34:55 dbSqlDate=2004-10-23 dbSqlTimestamp=2004-10-23 10:34:55.0 -- check for Normalization -dbSqlTimeConverted=Thu Jan 01 10:34:55 dbSqlDateConverted=Sat Oct 23 00:00:00 dbSqlTime=16:12:50 dbSqlDate=2005-07-01 dbSqlTimestamp=2005-07-01 16:12:50.0 -- check for Normalization -dbSqlTimeConverted=Thu Jan 01 16:12:50 dbSqlDateConverted=Fri Jul 01 00:00:00
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As you can see from the following results, the Oracle 10g driver does support normalization for the java.sql.Date and java.sql.Time objects: $ java TestNormalization oracle ok: loaded oracle driver. conn=oracle.jdbc.driver.OracleConnection@6e70c7 dbSqlTime=16:15:22 dbSqlDate=2005-07-01 dbSqlTimestamp=2005-07-01 16:15:22.0 -- check for Normalization -dbSqlTimeConverted=Thu Jan 01 16:15:22 PST 1970 dbSqlDateConverted=Fri Jul 01 00:00:00 PDT 2005
9-34. How Do You Make a java.sql.Timestamp Object for a Given Year, Month, Day, Hour, and So On
Given the year, month, day, hour, minutes, seconds, and milliseconds, the objective of the following code is to create a java.sql.Timestamp object: import java.sql.Timestamp; import java.util.Calendar; import java.util.GregorianCalendar; ... /** * Given year, month, day, hour, minutes, seconds, and * milliseconds, the objective is to create a Timestamp object. * @param year the year * @param month the month * @param day the day * @param hour the hour
CHAPTER 9 WORKING WITH DATE, TIME, AND TIMESTAMP IN JDBC
* @param minute the minute * @param second the second * @param millisecond the millisecond * @return a java.sql.Timestamp object */ public static Timestamp makeTimestamp(int year, int month, int day, int hour, int minute, int second, int millisecond) { Calendar cal = new GregorianCalendar(); cal.set(Calendar.YEAR, year); cal.set(Calendar.MONTH, month - 1); cal.set(Calendar.DATE, day); cal.set(Calendar.HOUR_OF_DAY, hour); cal.set(Calendar.MINUTE, minute); cal.set(Calendar.SECOND, second); cal.set(Calendar.MILLISECOND, millisecond); // now convert GregorianCalendar object to Timestamp object return new Timestamp(cal.getTimeInMillis()); }
9-35. How Do You Get a Date for a Specific Time Zone
The following Java code fragment illustrates how to use a Calendar object to retrieve a date for Los Angeles, California: import java.sql.Date; import java.sql.ResultSet; import java.util.Calendar; import java.util.TimeZone; ... ResultSet rs = stmt.executeQuery( "SELECT date_created FROM products WHERE product_id = 'PRD-123456'"); //creating an instance of Calendar Calendar cal = Calendar.getInstance(); // get the TimeZone for "America/Los_Angeles" TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); cal.setTimeZone(tz); if (rs.next()) { // the JDBC driver will use the time zone information in // Calendar to calculate the date, with the result that // the variable dateCreated contains a java.sql.Date object // that is accurate for "America/Los_Angeles". Date dateCreated = rs.getDate(1, cal); }
CHAPTER
Handling Exceptions in JDBC
Example isn t another way to teach, it is the only way to teach. Albert Einstein he purpose of this chapter is to provide solutions (expressed as snippets and reusable code samples) that deal with the java.sql.SQLException class. You will also examine other JDBC-related exception classes such as SQLWarning. SQLException, which extends the java.lang.Exception class, is a core JDBC exception class that provides information about database access errors and other errors. Most of the JDBC API methods throw SQLException, so client programs must handle it properly. For example, using the DriverManager. getConnection() method, if the database URL is invalid, then that method will throw an exception of type SQLException. This chapter covers the following exception classes used in the JDBC API: java.sql.SQLException: This class extends the java.lang.Exception class. This class is an exception that provides information about database access errors and other errors. Also, the SQLException class provides information in terms of nested/chained exceptions. Using this class, you can find vendor error codes and messages. java.sql.BatchUpdateException: This exception is thrown when an error occurs during a batch update operation. In addition to the information provided by SQLException, a BatchUpdateException provides the update counts for all commands that were executed successfully during the batch update (that is, all commands that were executed before the error occurred). The order of elements in an array of update counts corresponds to the order in which commands were added to the batch. java.sql.DataTruncation: This exception reports a DataTruncation warning (on reads) or throws a DataTruncation exception (on writes) when JDBC unexpectedly truncates a data value. java.sql.SQLWarning: This exception provides information about database access warnings. A warning is silently chained to the object whose method caused the warning to be reported. In most of the examples in this chapter, I will use the getConnection(String dbVendor) method to get a JDBC Connection object; you are strongly encouraged to replace it with your desired connection method (such as using a connection pool manager).
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