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Code 39 is a discrete and self-checking symbology which has variable data length. It is also called Alpha39, Code 3 of 9, Type 39, USS Code 39 and USD-3. This barcode is widely adopted in non-retail fields. Customers are free to download this evaluation version of KA.Barcode for Java.

A transaction s changes to the database are atomic: either all happen or none happen. A transaction is a correct transformation of the state. The actions taken as a group do not violate any of the integrity constraints associated with the state. Even though transactions can execute concurrently, it appears to each transaction that others executed either before or after it. Once a transaction completes successfully (for example, commit() returns success), then its changes to the state of the database survive any later failures.

This solution inserts a record with SQL NULL values: import java.util.*; import java.io.*; import java.sql.*; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class Demo_PreparedStatement_SetNull { public static void main(String[] args) { System.out.println("--Demo_PreparedStatement_SetNull begin--"); // read inputs from command line String dbVendor = args[0]; String idValue = args[1]; Connection conn = null; PreparedStatement pstmt = null; try { conn = VeryBasicConnectionManager.getConnection(dbVendor); System.out.println("conn="+conn); System.out.println("---------------"); // prepare query String query = "insert into nullable_table(id, " + "string_column, int_column) values( , , )"; // create PrepareStatement object pstmt = conn.prepareStatement(query); pstmt.setString(1, idValue); pstmt.setNull(2, java.sql.Types.VARCHAR); pstmt.setNull(3, java.sql.Types.INTEGER); // execute query, and return number of rows created int rowCount = pstmt.executeUpdate(); System.out.println("rowCount="+rowCount); System.out.println("--Demo_PreparedStatement_SetNull end--"); } catch(Exception e){ e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(pstmt); DatabaseUtil.close(conn); } } }

JDBC provides a low-level interface called DatabaseMetaData. This chapter explains how to dissect the DatabaseMetaData object in order to find out the table names, column names or types, stored procedures names and signatures, and other useful information. Before delving into the solution, let s take a look at the relationships (see Figure 2-1) between important low-level

You have two arrays; one is a string array and the other is a numerical array. You want to sort them individually.

This shows how to set up the Oracle database: SQL> create table nullable_table( 2 id varchar(4), 3 string_column VARCHAR(10),

int_column NUMBER );

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java itext barcode code 39