barcode generator visual basic 6 source code The executeUpdate Method in Java

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The executeUpdate Method
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In this example, an erroneous product description is corrected with an SQL UPDATE statement invoked by the executeUpdate method
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import javasql*; public class UpdateExample { public static void main(String[] args) throws ClassNotFoundException, SQLException { String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp"; ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); int nRows = stmtexecuteUpdate( " UPDATE products" + " SET description =" + "'Telemann: Concerto No 1 in F for Two Horns'"
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+ " WHERE itemcode = '022370'" ); Systemoutprintln(nRows + " rows updated"); stmtclose(); } finally { if (con != null) conclose(); } } }
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When successfully executed, the program prints 1 rows updated
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The executeQuery Method
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To see that the erroneous listing was corrected, this example uses a SELECT statement to display all sheet music titles in the product catalog that are Telemann concertos:
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JSP IN ACTION import javasql*; public class QueryExample { public static void main(String[] args) throws ClassNotFoundException, SQLException { String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp"; ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); ResultSet rs = stmtexecuteQuery( " SELECT itemcode, description" + " FROM products" + " WHERE prodtype = 'SM'" + " AND description like 'Telemann%'" + " AND description like '%Concerto%'" ); while (rsnext()) { String itemCode = rsgetString(1);
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String description = rsgetString(2); Systemoutprintln(itemCode + " " + description); } rsclose(); stmtclose(); } finally { if (con != null) conclose(); } } }
When run, it produces the corrected output:
022340 022350 022360 022370 Telemann: Telemann: Telemann: Telemann: Double Viola Concerto in G Viola Concerto in G Concerto for Horn Quartet Concerto No 1 in F for Two Horns
The process of getting values from the result set is explained later in this chapter
The execute Method
Although the execute method can be used for either queries or updates, it s strictly necessary only for operations that may return multiple results The Statement interface provides methods for determining what has been returned and for processing the results The most common use for execute is for processing unknown SQL strings, such as in this example, which reads and processes SQL statements from a file:
import javaio*; import javasql*; public class ExecuteExample { public static void main(String[] args) throws ClassNotFoundException, SQLException, IOException { String DRIVER = "orgenhydrainstantdbjdbcidbDriver"; String URL = "jdbc:idb:" + "D:/lyricnote/WEB-INF/database/products/dbprp";
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Database Access
ClassforName(DRIVER); Connection con = null; try { con = DriverManagergetConnection(URL); Statement stmt = concreateStatement(); // Read SQL statements from a file BufferedReader in = new BufferedReader( new FileReader("executeExamplesql")); while (true) { String line = inreadLine(); if (line == null) break; // Execute statement JSP IN ACTION boolean hasResultSet = stmtexecute(line); while (true) { if (hasResultSet) { ResultSet rs = stmtgetResultSet(); Systemoutprintln("Processing result set"); // process result set rsclose(); } else { int count = stmtgetUpdateCount(); if (count == -1) break; Systemoutprintln("Processing update count"); // process update count } // See if there are any more results hasResultSet = stmtgetMoreResults(); } } stmtclose();
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inclose(); } finally { if (con != null) conclose(); } } }
The initial return code from execute is a boolean value that is true if the statement execution produced a result set If not, the update count can be obtained with StatementgetUpdateCount() If the update count is -1, then no more results exist Otherwise, the StatementgetMoreResults() method can be called to cycle through the next result set or update count It returns a boolean value with the same interpretation as the one returned by execute
The executeBatch Method
JDBC 20 introduced the capability to submit a group of update statements to be executed as a batch In some cases, this can represent a significant performance improvement The methods used in connection with batch updates are these: I clearBatch resets a batch to the empty state I addBatch adds an update statement to the batch I executeBatch submits the batch and collects update counts Not all drivers support batch updates Those that do indicate this by returning true from their DatabaseMetaDatasupportsBatchUpdates() method One driver that does implement this is the JDBC-ODBC bridge with Microsoft Access In the following example, the LyricNote composers Access database is updated with a table of composers who lived to at least the age of 90
import javaio*; import javasql*; import javautil*; public class BatchUpdateExample { public static void main(String[] args) throws ClassNotFoundException, SQLException, IOException { ClassforName("sunjdbcodbcJdbcOdbcDriver");
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