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According to JDK 1.5, the DatabaseMetaData allows you to obtain information about the database and has over one hundred methods. You can find a description of DatabaseMetaData at http://java.sun.com/j2se/1.5.0/docs/api/java/sql/DatabaseMetaData.html. To obtain a DatabaseMetaData object, use these general steps: 1. Connect to a database by using an instance of the Connection object. 2. To find out the names of the database schema, tables, and columns, get an instance of the DatabaseMetaData object from the Connection. 3. Perform the actual query by issuing a SQL query string. Then use the Connection to create a Statement class to represent your query. 4. The query returns a ResultSet. To find out the names of the column rows in that ResultSet, obtain an instance of the ResultSetMetaData class. To get a DatabaseMetaData, use the following snippet: Connection conn = null; DatabaseMetaData dbMetaData = null; try { // Get a valid database connection conn = getConnection(); // Get an instance of a DatabaseMetaData object dbMetaData = conn.getMetaData(); if (dbMetaData == null) { // Database metadata is NOT supported } else { // Database metadata is supported and you can invoke // over 100 methods defined in DatabaseMetaData // Now that we have a valid database metadata (DatabaseMetaData) object // it can be used to do something useful: // Retrieves whether this database supports using columns not included in // the SELECT statement in a GROUP BY clause provided that all of the // columns in the SELECT statement are included in the GROUP BY clause. System.out.println(dbMetaData.supportsGroupByBeyondSelect());

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The Java Data Matrix barcode reader control is entirely written in Java JDK 1.2 and supports the later versions. ... This product may decode the Data Matrix in PNG, GIF, JPEG, and Java AWT. It supports multi-page TIFF and multiple Data Matrix barcodes in one image.

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8 Feb 2012 ... Javadocs ... Example DataMatrix symbol (rectangular) ... This feature is particularly useful if you want to generate DataMatrix symbols for the ...

The following program retrieves an existing record from the TestDates table (with an ID of "id100"). Here is the program listing: import java.sql.*; import jcb.util.DatabaseUtil; public class GetDate { public static Connection getConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@localhost:1521:scorpian"; Class.forName(driver); System.out.println("ok: loaded oracle driver."); return DriverManager.getConnection(url, "scott", "tiger"); } public static void main(String args[]) { String GET_RECORD = "select date_column, time_column, "+ "timestamp_column from TestDates where id = "; ResultSet rs = null; Connection conn = null; PreparedStatement pstmt = null; try { conn = getConnection(); pstmt = conn.prepareStatement(GET_RECORD); pstmt.setString(1, "id100"); rs = pstmt.executeQuery(); if (rs.next()) { java.sql.Date dbSqlDate = rs.getDate(1); java.sql.Time dbSqlTime = rs.getTime(2); java.sql.Timestamp dbSqlTimestamp = rs.getTimestamp(3); System.out.println("dbSqlDate="+dbSqlDate); System.out.println("dbSqlTime="+dbSqlTime); System.out.println("dbSqlTimestamp="+dbSqlTimestamp); } } catch( Exception e ) { e.printStackTrace(); System.out.println("Failed to insert the record."); System.exit(1); } finally { DatabaseUtil.close(rs); DatabaseUtil.close(pstmt); DatabaseUtil.close(conn); } } }

Figure 7-1. Table consisting of a few rows and columns When the mouse pointer moves over any row, that row will be highlighted as shown in Figure 7-2.

Running the GetDate.java program will generate the following output (the values are after retrieval from TestDates): $ javac GetDate.java $ java GetDate ok: loaded oracle driver. dbSqlDate=2002-11-24 dbSqlTime=23:05:52 dbSqlTimestamp=2002-11-24 23:05:52.0 As you can observe, whatever values you deposited into the database, you were able to get back correctly (with the exception of Timestamp, which differs in value, so this is negligible).

// Retrieves whether this database supports using a column that is not in // the SELECT statement in a GROUP BY clause. System.out.println(dbMetaData.supportsGroupByUnrelated()); ... } } catch(SQLException e) { // deal and handle the SQLException ... } catch(Exception e2) { // deal with other exceptions ... }

The class java.util.Date represents a specific instant in time, with millisecond precision. The following method returns the current date as a java.util.Date object: /** * Get current date as a java.util.Date object * @return current date as a java.util.Date object */ public static java.util.Date getJavaUtilDate() { java.util.Date date = new java.util.Date(); return date; }

You have a table consisting of a few rows and columns. You want alternate columns of the table to be highlighted.

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Java Data Matrix barcode reader control SDK reads and decodes ...
Data Matrix scanner for Java help you quickly scan and interpret the Data Matrix barcode images created in Java projects.

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