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public static Map<String, String> getOracleTablesAndViews(Connection conn) throws Exception { Statement stmt = null; ResultSet rs = null; try { stmt = conn.createStatement(); rs = stmt.executeQuery(ORACLE_TABLES_AND_VIEWS); if (rs == null) { return null; } Map<String, String> list = new HashMap<String, String>(); while (rs.next()) { String name = DatabaseUtil.getTrimmedString(rs, 1); String type = DatabaseUtil.getTrimmedString(rs, 2); //System.out.println("name="+name); if (name != null) { list.put(name, type); } } return list; } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); } }

According to the JDBC specification, by default a database connection commits all updates to the database immediately and automatically. By default, new connections are in autocommit mode. For example, executing an UPDATE SQL query immediately commits the change.

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Figure 8-22. JSON data imported in the form of list items in the web page We can also simplify the above jQuery code by making use of the $.getJSON() method, which is particularly designed for retrieving data from a JSON file. This method makes a GET request to the specified url address (on the server), along with its passed parameters, and returns information in the form of JSON encoded data. Its syntax looks like this: $.getJSON(url, parameters, callbackfuncton) And the parameters are: url is name of the file along with its address on the server parameters is a string containing information in the form of name and value pairs to be passed to the url callbackfunction is the response generated from the server , when the request succeeds

The following example shows how to disable autocommits and explicitly commit: import java.sql.*; import jcb.util.DatabaseUtil; ... Connection conn = null; try { conn = <get-a-database-connection>; // disable autocommit conn.setAutoCommit(false); // execute any number of SQL updates... // commit updates conn.commit(); } catch (SQLException e) { // Roll back update conn.rollback(); } finally { // disconnect from the database: release Connection object DatabaseUtil.close(conn); }

/** * Get the table names for a given connection object. * @param conn the Connection object * @return the list of table names as a List. * @exception Failed to get the table names from the database. */ public static Map<String, String> getTablesAndViews(Connection conn) throws Exception { ResultSet rs = null; try { DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; }

The jQuery code to use the $.getJSON() method is as shown here, and it works much the same way as our previous solution but as you can see, leads to some neater code: $(document).ready(function() { $('#submit').click(function () { $.getJSON('drinkinfo.json', function (data){ var drinks="<ul>"; $.each(data, function(i,n){ drinks+="<li>"+n["optiontext"]+"</li>"; }); drinks+="</ul>"; $('#message').append(drinks); }); return false; }); });

The following example shows how to enable autocommits: import java.sql.*; import jcb.util.DatabaseUtil; ... Connection conn = null; try { conn = <get-a-database-connection>; // enable autocommit conn.setAutoCommit(true); // execute any number of SQL updates... // NOTE: from now on, every statement will commit } catch (SQLException e) { // handle the exception } finally { // disconnect from the database: release Connection object DatabaseUtil.close(conn); }

The rules for autocommit are as follows: if autocommit is true, then commit happens automatically after every SQL query/statement; if autocommit is false, then it does not. You can get the autocommit value by invoking the Connection.getAutoCommit() method. You can turn off autocommit mode for an active database connection with the following: java.sql.Connection conn = valid-database-connection-object; conn.setAutoCommit(false) ; and turn it back on again with this: conn.setAutoCommit(true); Once autocommit is off (that is, false), no SQL statements will be committed (that is, the database will not be permanently updated) until you have explicitly told it to commit by invoking the Connection.commit() method: conn.commit();

rs = meta.getTables(null, null, null, DB_TABLE_AND_VIEW_TYPES); if (rs == null) { return null; } Map<String, String> list = new HashMap<String, String>(); while (rs.next()) { String name = DatabaseUtil.getTrimmedString(rs, COLUMN_NAME_TABLE_NAME); String type = DatabaseUtil.getTrimmedString(rs, COLUMN_NAME_TABLE_TYPE); if (name != null) { list.put(name, type); } } return list; } finally { DatabaseUtil.close(rs); } } }

You have an XML file that contains information about some students. You want to import that information from an XML file into the current web page asynchronously. The XML file contains some user defined tags to organize its information.

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