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Apart from the anonymous position-based parameters, we can use named JDBC parameters. When you use named parameters in the SQL statement, you can then use the update method that takes a Map as its first argument and supply the values as "parameter name" => parameter value. Listing 9-19 shows code that demonstrates this. Listing 9-19. Using Named Parameters in SqlUpdate class SqlUpdateDemo { ... private static class NamedInsert extends SqlUpdate { private static final String SQL = "insert into t_customer (id, first_name, last_name, last_login, " + "comments) values (:id, :firstName, :lastName, :lastLogin, :comments)"; NamedInsert(DataSource dataSource) { super(dataSource, SQL); declareParameter(new SqlParameter(Types.INTEGER)); declareParameter(new SqlParameter(Types.VARCHAR)); declareParameter(new SqlParameter(Types.VARCHAR)); declareParameter(new SqlParameter(Types.TIMESTAMP)); declareParameter(new SqlParameter(Types.CLOB)); } } ... private void runInsert() { Map<String, Object> parameterMap = new HashMap<String, Object>(); parameterMap.put("id", 6L); parameterMap.put("firstName", "John"); parameterMap.put("lastName", "Appleseed"); parameterMap.put("lastLogin", null); parameterMap.put("comments", null); this.namedInsert.updateByNamedParam(parameterMap); } ... } This approach is safer than using an array of objects and relying on the position of elements in the array, even though the calling code is more complicated. If you do not want to write your own method to handle the updates in your subclasses of SqlUpdate, we recommend that you use named parameters instead of position parameters. Finally, the SqlUpdate class provides convenience overloads of the update method that take only a few int, long, or String parameters. These methods are particularly elegant for deletes (see Listing 9-20). winforms ean 13 reader EAN-13 .NET WinForms DLL - Create EAN-13 barcodes in .NET with
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Home > .NET Barcode Reader > EAN-13 Barcode Reading Control for .NET Class ... NET WinForms EAN-13 Barcode Generator Library. Barcode products for . Listing 9-20. A Deletion Operation Demonstration class SqlUpdateDemo { ... private static class DeleteWhereIdGreater extends SqlUpdate { private static final String SQL = "delete from t_customer where id > "; DeleteWhereIdGreater(DataSource dataSource) { super(dataSource, SQL); declareParameter(new SqlParameter(Types.INTEGER)); } } ... private void runInsert() { this.deleteWhereIdGreater.update(1L); } ... } The DeleteWhereIdGreater performs a simple delete statement and is self-explanatory. The new bit of code is in bold and shows that we can use one of the convenience update methods, in this case one that takes one argument of type long. It is good safe coding practice to include a check for the maximum number of affected rows. As an example, imagine an update statement that should modify only one row. However, you have made a mistake in the SQL and ended up modifying the entire table. It would be useful to catch this situation, and thus be able to take recovery steps immediately, rather than waiting until someone notices that all the rows have been modified. To perform this check, call the setMaxRowsAffected(int) method, supplying the maximum number of rows that should be affected by the statement execution. If the number of affected rows is greater than the maximum, the SqlUpdate call will throw JdbcUpdateAffectedIncorrectNumberOfRowsException. If you are running the JDBC code in a transaction, this check may just save your neck! microsoft word 2007 barcode add in, ms word code 39 font, word 2010 ean 128, police word code 128, birt pdf 417, data matrix code word placement winforms ean 13 reader EAN-13 Reader for .NET read EAN-13 barcode images in .NET ...
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How to read, scan EAN-13 linear barcode image in .NET applications using ... Mature and high-quality barcode reader /scanner for Microsoft . ... NET WinForms As the name implies, this subclass of SqlUpdate is used to perform batch queries. This class takes care of automatically splitting the batch into chunks that the database (and its JDBC driver) can handle. Using batch operation implies that there will be many updates, and this means that you cannot use LOB columns. Using the BatchSqlUpdate is incredibly simple: call the update method for every row you want to update, supplying the necessary parameters. The BatchSqlUpdate will use the batchSize property (you can set it using setBatchSize(int)) and implicitly call the flush method once the number of updates have reached batchSize. You can call flush explicitly to immediately execute the batched up statements during the updates, but you must call it after the last call to update. Listing 9-21 demonstrates the use of the BatchSqlUpdate. Listing 9-21. Using BatchSqlUpdate class BatchSqlUpdateDemo { ... private static class BatchInsert extends BatchSqlUpdate { private static final String SQL = "insert into t_customer (id, first_name, last_name, last_login, " + "comments) values ( , , , , null)"; BatchInsert(DataSource dataSource) { super(dataSource, SQL); winforms ean 13 reader Best 20 NuGet ean-13 Packages - NuGet Must Haves Package
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