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/** * Retrieves a description of the given table's columns. * @param conn the Connection object * @param tableName name of a table in the database. * @return the list of columns as a ResultSet object * @exception Failed to get the table's columns. */ public static ResultSet getColumns(Connection conn, String tableName) throws Exception { if ((tableName == null) || (tableName.length() == 0)) { return null; } DatabaseMetaData meta = conn.getMetaData(); if (meta == null) { return null; } // // The Oracle database stores its table names as // uppercase; if you pass a table name in lowercase // characters, it will not work. MySQL database does // not care if the table name is uppercase/lowercase. // return meta.getColumns(null, null, tableName.toUpperCase(), null); } }

The Statement interface provides sufficient methods for executing SQL statements. For executing SQL statements, you should follow four steps: 1. Get a java.sql.Connection object. 2. Using a Connection object, create a Statement object. 3. Execute your SQL statement using a Statement object and generate ResultSet objects.

All the child elements of the div of id="root" are accessed and assigned to a variable $nodes. We display the length of the collection of child nodes using the alert statement. Thereafter, with the help of the each() method, we access all the elements stored in $nodes one at a time. We use the text() method and access and concatenate the text of the elements in a string variable $txt. At the end, the text of all the children is displayed via another alert() method. Let us look at the methods used in the preceding jQuery code one by one.

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If a method does not return a ResultSet object explicitly, then you may call the Statement.getResultSet() method to get the desired ResultSet object.

Figure 8-21. Invoking GetColumns for MySQL (XML output)

4. Extract the values from the generated ResultSet objects. The Statement interface provides the methods listed in Table 11-1 for executing SQL statements.

children()

execute(String sql) execute(String sql, int autoGeneratedKeys) Executes the given SQL statement, which may return multiple results Executes the given SQL statement, which may return multiple results, and signals the driver that any autogenerated keys should be made available for retrieval Executes the given SQL statement, which may return multiple results, and signals the driver that the autogenerated keys indicated in the given array should be made available for retrieval Executes the given SQL statement, which may return multiple results, and signals the driver that the autogenerated keys indicated in the given array should be made available for retrieval Submits a batch of commands to the database for execution and, if all commands execute successfully, returns an array of update counts Executes the given SQL statement, which returns a single ResultSet object Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or a SQL statement that returns nothing, such as a SQL DDL statement Executes the given SQL statement and signals the driver with the given flag about whether the autogenerated keys produced by this Statement object should be made available for retrieval Executes the given SQL statement and signals the driver that the autogenerated keys indicated in the given array should be made available for retrieval Executes the given SQL statement and signals the driver that the autogenerated keys indicated in the given array should be made available for retrieval

Figure 8-22. Invoking GetColumns for Oracle (XML output)

execute(String sql, int[] columnIndexes)

The children() method is a tree-traversal method that searches for the immediate children of the specified element and returns a new jQuery object. This method travels only a single level down in the DOM tree. In our example, this method accesses all the DOM nodes defined in the root div element and assigns them to the variable $nodes. $nodes is a jQuery object that contains the three div elements defined in the root div element. Using the $nodes object's length attribute, we first display the count of the number of DOM nodes in the HTML file.

execute(String sql, String[] columnNames)

To get a database view s columns, you can use the GetColumns servlet and, for the table parameter, pass the name of your desired database view name. Next, I ll show you how to the get the columns of views from MySQL and Oracle databases.

int[]

each()

executeBatch()

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