dynamic sql in oracle

Label:Http://www.cnblogs.com/goody9807/archive/2010/10/19/1855697.html Dynamic SQL statement Basic syntax 1: Normal SQL statements can be executed with execEg:select * from TableName Exec (' select * from TableName ') Exec sp_executesql n ' select * from TableName '--please note that the string must be added n before 2: Field name, table name, database name, etc

Tags: t-SQL Performance database dynamic SQL SQLCause: As a result of recent work needs and past doubts, so decided to start studying dynamic SQL. As a result of the development of a few years away from the front line, a lot of technical things are not too much research, as

in most cases, the data source for the report SQL is fixed, but it is sometimes necessary to dynamically make certain parts of it dynamically, such as allowing users to query their own report data by selecting tables and fields in a report application, and when developing a report, they want to use the same template for similar reports (detail or summary). At this point you need to receive the corresponding parameters in the report stitching out

famous subroutine;Delete procedure:drop procedure3.5.1Use cases of the processCreate a stored procedureCreate or replace procedure P_account(p_id number,p_realname out varchar2,p_age out number)LsBeginSelect Real_name,round ((sysdate-birthdate)/360) into P_realname,p_ageFrom accountwhere id=p_id;exceptionWhen No_data_found ThenP_realname: = ' no account ';p_age:=0;EndNamed subroutine call:DeclareV_realname varchar2 (20);V_age number;BeginP_account (1011,v_realname,v_age);Dbms_output.put_line (V

Tags: tag share for Efault object nbsp Select conf Source AnalysisProgrammers who have developed experience for several years should have a dark scolding of native SQL statements. Because they can't get a business done in one sentence, often by using code to stitch up related SQL statements. I believe you will understand the meaning of the eternal (1=1), Eternal (1=2) in

Data dictionaries and dynamic performance viewsData dictionary is an important part of Oracle database, which improves some system information of database. (Static information)The dynamic performance view records the information after the routine is started. (Dynamic information)The data dictionary records the system I

SQL Injection Process details _ dynamic node Java school arrangement, sqljava The general idea of SQL injection attacks is: 1. SQL Injection Location discovered;2. Determine the background database type;3. Determine the executable status of XP_CMDSHELL.4. WEB virtual directory discovered5. Upload a JSP Trojan;6. Get th

both Oracle and SQL Server follow the SQL-92 standard: http://owen.sj.ca.us/rkowen/howto/sql92F.html , but there are some differences, the difference is as follows: Oracle table name, field name, stored procedure name, variable name cannot exceed 30 string lengths. The top syntax is not supported in

In some cases, the SQL statement where condition requires some security judgments, such as if the incoming parameter is empty when the query is in a certain condition, the result of the query is likely to be empty, and maybe we need to find out all the information when the parameter is empty. Use Oracle's sequence, MySQL's function to generate IDs. Then we can use dynamic

The difference between Oracle dynamic registration and static registration: Dynamic monitoring does not require any information about the data to be recorded in the Listener.ora file, only the configuration information of the listener is written to the file. For example:LISTENER =(Description_list =(DESCRIPTION =(address= (PROTOCOL = IPC) (Key=extpro1))(address=

configuration of the Listener.ora file when the instance starts, registering the instance and service to the listener. 　　Whenever a database is started, two messages are registered to the listener by default: the instance and service for the database server. 　　At static registration, Global_dbname provides the service name out of the Listener.ora, and Sid_name in Listener.ora provides the registered instance name. When a static registration method is taken, the contents of the Listener.ora are

strive not to use cursors, because allocation and release of cursors are not required, which can greatly save database resources and improve efficiency. Ii. Basics of dynamic SQL statements In No. 1, we have used dynamic SQL. Here we will summarize the frequently used dynam