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show() makes the specified hidden element visible. .show(speed, callback) Here speed defines the duration of the animation effect that is, whether the element has to be displayed immediately or slowly. The speed can be defined in terms of milliseconds or as one of the predefined strings: slow, normal, or fast (which indicate speed values of 600, 400, and 200 milliseconds, respectively). That is, the speed defines how long the animation will run. If it is omitted, the default speed normal is used. callback is the function that is called when the animation is complete. hide()makes the specified element invisible: .hide(speed, callback) speed and callback have the same meanings here as they did with show(). In our jQuery code, the statement $('.message').hide(); makes the div element of the class message invisible initially (that is, only half the text of the upper div element will be displayed), and the statement $('span.readmore').click(function(){ attaches the click event to the span element of class readmore (that is, to the text Read More...). The statement $('.message').show('slow'); makes the div element of class A visible when the Read More text is clicked, hence displaying the hidden text. The statement $(this).hide(); hides the text message Read More , as it is no longer required.

This method s parameters are as follows: catalog: A catalog name; it must match the catalog name as it is stored in the database. "" retrieves those without a catalog; null means that the catalog name should not be used to narrow the search. schema: A schema name; it must match the schema name as it is stored in the database. "" retrieves those without a schema; null means that the schema name should not be used to narrow the search. table: A table name; it must match the table name as it is stored in the database. This method returns a ResultSet in which each row is a primary key column description. If a database access error occurs, it throws a SQLException. The Solution: Using DatabaseMetaData.getImportedKeys() When using the DatabaseMetaData.getImportedKeys() method, try to pass all required parameters with non-null and non-empty values. Passing null/empty values might slow down getting the results from this method. If your database is not changing often, you may cache the returned values on the server side. This method will give you a good idea about the dependency of your database tables. /** * class name: jcb.meta.DatabaseMetaDataTool * * Retrieves a description of the primary key columns that are * referenced by a table's foreign key columns (the primary keys * imported by a table). They are ordered by PKTABLE_CAT, * PKTABLE_SCHEM, PKTABLE_NAME, and KEY_SEQ. *

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getClobAsURL()

The following shows getClobAsURL(): private static String getClobAsURL(Clob Clob) throws Exception { InputStream in = null; FileOutputStream out = null; try { if (Clob == null) { return null; } // get a random GUID for Clob filename String guid = RandomGUID.getGUID(); String ClobFile = CLOB_DIRECTORY + CLOB_FILE_PREFIX + guid; in = Clob.getAsciiStream(); if (in == null) { return null; } out = new FileOutputStream(ClobFile); int length = (int) Clob.length(); int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; while ((length = in.read(buffer)) != -1) { out.write(buffer, 0, length); }

Initially, only half the text is displayed along with a text message Read More at the bottom, as shown in Figure 3-30.

* @param conn the Connection object * @param catalog database catalog. * @param schema database schema. * @param tableName name of a table in the database. * @return the list (as an XML string) of the primary key columns * that are referenced by a table's foreign key columns * * @exception Failed to get the ExportedKeys for a given table. */ public static String getImportedKeys(java.sql.Connection conn, String catalog, String schema, String tableName) throws Exception { ResultSet rs = null; try { if ((tableName == null) || (tableName.length() == 0)) { return null; } DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } // // // // // rs if } StringBuffer buffer = new StringBuffer(); buffer.append("<importedKeys>"); while (rs.next()) { String pkTableName = DatabaseUtil.getTrimmedString(rs, "PKTABLE_NAME"); String pkColumnName = DatabaseUtil.getTrimmedString(rs, "PKCOLUMN_NAME"); String fkTableName = DatabaseUtil.getTrimmedString(rs, "FKTABLE_NAME"); String fkColumnName = DatabaseUtil.getTrimmedString(rs, "FKCOLUMN_NAME"); int fkSequence = rs.getInt("KEY_SEQ");

out.flush(); return CLOB_URL + CLOB_FILE_PREFIX + guid; } finally { IOUtil.close(in); IOUtil.close(out); } }

doGet()

When the text Read More... is selected, the hidden text is also displayed, as shown in Figure 3-31.

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