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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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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); } }
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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Invoking GetColumns for MySQL
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Figure 8-21 shows how to run the solution for the MySQL database.
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Figure 8-21. Invoking GetColumns for MySQL (XML output)
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CHAPTER 8 WEB ACCESS TO METADATA, PART 1
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Invoking GetColumns for Oracle
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Figure 8-22 shows how to run the solution for the Oracle database.
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Figure 8-22. Invoking GetColumns for Oracle (XML output)
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8.16. How Do You Get a View s Columns
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.
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
MySQL Database Setup
mysql> show tables; +-------------------+ | Tables_in_octopus | +-------------------+ | emps_roles | | emps_table | | roles_table | +-------------------+ 3 rows in set (0.00 sec) mysql> create view admin_roles as select role, description -> from roles_table where role like 'admin%'; Query OK, 0 rows affected (0.03 sec) mysql> desc admin_roles; +-------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+-------------+------+-----+---------+-------+ | role | varchar(5) | NO | | | | | description | varchar(25) | NO | | | | +-------------+-------------+------+-----+---------+-------+ 2 rows in set (0.02 sec)
Oracle Database Setup
SQL> desc dept; Name Null ----------------------------------------- -------DEPTNO NOT NULL DNAME LOC SQL> select * from dept; DEPTNO DNAME LOC ---------- -------------- ------------10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON SQL> create view deptPlus20 as select DEPTNO, DNAME View created. SQL> select * from deptPlus20; DEPTNO DNAME ---------- -------------30 SALES 40 OPERATIONS Type -----------NUMBER(2) VARCHAR2(14) VARCHAR2(13)
from dept where DEPTNO > 20;
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
Invoking GetColumns for MySQL
Figure 8-23 shows how to run the solution for the MySQL database.
Figure 8-23. Invoking GetColumns for MySQL (XML output)
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
Invoking GetColumns for Oracle
Figure 8-24 shows how to run the solution for the Oracle database.
Figure 8-24. Invoking GetColumns for Oracle (XML output)
8.17. How Do You Get Stored Procedure Names
According to JDBC tutorial (http://java.sun.com/docs/books/tutorial/jdbc): A stored procedure is a group of SQL statements that form a logical unit and perform a particular task. Stored procedures are used to encapsulate a set of operations or queries to execute on a database server. For example, operations on an employee database (hire, fire, promote, lookup) could be coded as stored procedures executed by application code. Stored procedures can be compiled and executed with different parameters and results, and they may have any combination of input, output, and input/output parameters. Stored procedures are supported by most DBMSs, but there is a fair amount of variation in their syntax and capabilities.
CHAPTER 8 WEB ACCESS TO METADATA, PART 1
In order to execute a stored procedure, you need to know its name and its associated signature the number of parameters, the type of each parameter, the mode of each parameter (IN, OUT, IN/OUT), and the result type.
Oracle Database Setup
SQL> select * from employees; ID NAME AGE ---------- -------------------- ---------11 Alex Smith 25 22 Don Knuth 65 33 Mary Kent 35 44 Monica Seles 30 99 Alex Edison 80 100 Al Sumner 70 105 Al Sumner 90 7 rows selected. SQL> CREATE OR REPLACE FUNCTION getEmployeesCount RETURN INTEGER IS 2 empCount INTEGER; 3 BEGIN 4 SELECT count(*) INTO empCount FROM employees; 5 RETURN empCount; 6 END getEmployeesCount; 7 / Function created. SQL> var myCount number; SQL> exec :myCount := getEmployeesCount; PL/SQL procedure successfully completed. SQL> print myCount; MYCOUNT ---------7 SQL> create procedure raiseAge(id_Param number, increment_Param number) is 2 cursor empCursor (myid number) is 3 select id from EMPLOYEES where id = myid 4 for update of age; 5 6 emp_id number(8); 7 begin 8 open empCursor(id_Param); 9 loop 10 fetch empCursor into emp_id; 11 exit when empCursor%NOTFOUND; 12 update EMPLOYEES set age = age + increment_Param 13 where current of empCursor; 14 end loop;
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