oracle implementation

First, create a table: CREATE TABLE Example ( ID Number (4) Not NULL PRIMARY KEY, NAME VARCHAR (25)); Then, customize a sequence (sequence): CREATE SEQUENCE example_sequence INCREMENT by 1--add a few each time Start with 1-counting starting from 1 Nomaxvalue--Do not set the maximum value Nocycle--keep accumulating, not looping NOCACHE--Do not build buffers Create a second trigger: CREATE TRIGGER Example_triger before INSERT on

First look at how SQL writesSelect * from ( Select A.*, ROWNUM rn from (lowest query statement ) A wherelt; = #{endcol} ) where gt; #{startcol}Note: Of course we also need select COUNT (*) the lowest query statement to get the total number of result sets. And then convert the Endcol and Startcol.The conversion code is as follows://int totalrecord= total number of bars; //Calculate Paging

Tags: cells for end int inserting data maximum char IDT whenFirst, create a table: CREATE TABLE Example ( ID Number (4) Not NULL PRIMARY KEY, NAME VARCHAR (25)); Then, customize a sequence (sequence): CREATE SEQUENCE example_sequence INCREMENT by 1--add a few each time Start with 1-counting starting from 1 Nomaxvalue--Do not set the maximum value Nocycle--keep accumulating, not looping NOCACHE--Do not build buffers Create a second trigg

Tags: database information ROM image into tracking int context host---Create log table records user logon informationCREATE TABLE User_log(user_id VARCHAR2 (30),session_id Number (10),HOST_NAME VARCHAR2 (30),Last_module VARCHAR2 (30),Logon_day DATE,Logoff_day DATE,Elapsed_minutes Number (10)); --Create a trigger after the user logs in to count the user's login information: Create or Replace Trigger Logon_triggerAfter logon on databaseBeginINSERT INTO User_logValuesUserSys_context (' Userenv ',

) {This.age = age;}}4, StuservicePackage sql2excel;Import Java.io.File;Import java.sql.Connection;Import java.sql.PreparedStatement;Import Java.sql.ResultSet;Import java.sql.SQLException;Import java.util.ArrayList;Import java.util.List;Import JXL. Sheet;Import JXL. Workbook;/*** @author Liuhaijun**/public class Stuservice {/*** @return*/public static listlisttry {Connection conn = null;conn = Dbutil.getconnection ();Create precompiled statement objects, usually with this instead of statementPrep

Label:Sequences, triggers, and other related uses SQL Server under Microsoft grows as long as the set column identity Create Table myTable ( intIdentity(1,1primarykey NOT null, varchar() ; MySQL to achieve self-growth as long as the set column auto_increment Create Table myTable ( intprimarykeynotnull, varchar(() ); The Oracle database is a bit different, and does not have a self-growing column type like MySQL and SQL Server databases, but ra

Tags: Oracle--Delete the previously existing table: drop table emp; --Creating the Table EMP CREATE TABLE emp ( deptno number, ename varchar2 (), sal number ); --Insert data- -Department 1 Employee Information INSERT INTO EMP values (1, ' Wang Hee 1 ', 15000); INSERT into EMP values (1, ' King Hee 2 ', "); INSERT into EMP values (1, ' King Hee 3 ', 115000); INSERT into EMP values (1, ' King Hee 4 ', 12300); --Department 2 employee in

oracle| Stored Procedures | Paging |oracle| stored Procedures | Paging after looking at a number of paging stored procedures, it was found to be for SQL Server, without Oracle, so I wanted to write a stored procedure about Oracle because the database I used was Oracle. -----

oracle| Program | pagination | data | show In this paper, the step-by-step display of Oracle data records using ASP is elaborated. first, the introduction Paging is required to access a table with a large amount of data through a browser. ASP's paging display of database records can be achieved through the ADO object set Recordset object. The recordset has the following several properties for paging display

The ANSI-defined transaction ISOLATION level standard (http://blog.csdn.net/u010415792/article/details/8977635) is mentioned in the previous article, but different vendors implement the same approach. This article mainly introduces the transaction isolation level implemented by Oracle, all of which are dependent on undo, and the higher the isolation level, the greater the likelihood of ORA-01555 errors. 1, Read committed (Default) The lowest isolati

Oracle to Oracle version Usually to the customer production environment deployment reference documents, summary of the more detailed, mainly detailed description of the process of data initialization, parameters of different environments, so just write a relatively simple, according to the actual conditions to add it. 1. Pre-preparation 1.1. System Level Windows needs to install c\c++ 2005 Runtime 1.2. Data

to restore the data as much as possible. You need to know that hundreds of tables do not have a table name/column name to distinguish them from what kind of work. Configure system files in Dul D:\xifenfei\system01.dbf D:\temp\recover\dul\bak>dul Data Unloader:11.2.0.0.4-internal only-on Wed Sep 17:01:56 2016 with 64-bit io functions Copyright ( c) 1994 2016 Bernard van Duijnen all rights reserved. strictly Oracle Internal use only

During the development of Oracle applications, accessing database objects and writing SQL programs is tedious and time-consuming, and the day-to-day management of the database requires a lot of SQL scripts to complete. Quest software provides an efficient Oracle Application development tool-toad for this purpose. In the new version of Toad, the DBA module is also included to help the DBA complete a number o

Objective Recently do projects need to import a batch of 3000多万条 POI data to Oracle database, simple insert import speed is too slow, use SQLLDR batch import 3000多万条 data spent 20 minutes, speed can also, now share to everyone, the specific methods are as follows: 1. New import Control file Input.ctl, file contents as follows: Load data Characterset UTF8 Infile ' H:\POI\baidu.txt ' Append into table Tbl_poi_baidu fields Terminated by "," opt

In large commercial applications, the data disaster recovery backup is very important and necessary. Based on his own practical experience, the author designs a set of simple data automatic backup scheme, which can be used for reference by database managers. All the procedures in this paper have been tested and run well. The simulated offsite environment here is a host of two sets of Sun Solaris systems, with a backup method that provides a standard backup of

Paging Query format: SELECT * from ( select A.*, rownum RN to (SELECT * FROM table_name) A WHERE rownum which the most inner query select * FROM table_name represents the original query statement without paging。 RowNum The paging query statement given above is highly efficient in most cases. The purpose of paging is to control the size of the output result set and return the result as quickly as possible. In the paging query above, this consideration is mainly reflected in the sentence wh

-One-dimensional array:--Nested table-There is no limit to size.--essentially disorderly.--varray--Dimensions must be fixed, all instances of the same size.--In a procedural language, it can be retrieved as an ordered array but viewed as a single, indivisible unit within Oracle.-High storage efficiency. --Multidimensional array--Using a record and record of --Set up a test tabledrop table t_test_1;CREATE TABLE T_test_1 (PID Number (10),PName varchar2

oracle| Page | data | database | Statement we often want to access one of the middle parts of a dataset, such as the 10th to 20th Records, and Oracle has a good statement to implement, and that is with. The following examples are used: With Partdata as (select RowNum rowno,t.* from table1 t where t.id>200407160000) SELECT * from Partdata where rowno between 20 Of course there are other ways, but I am

Understanding Oracle Execution Plans is the first step in optimization, let's start with the example below. The following supplementary content 1. Create Test table[SQL] view plain copy sql> create table t as Select 1 id,object_name from Dba_objects; Table created sql> update t set id=99 where rownum=1; 1 row updated sql> commit; Commit Complete sql> CREATE index t_ind on t (ID); Index created Oracle O

The example in this article describes how Oracle implements multiple-line consolidation. Share to everyone for your reference. The specific analysis is as follows: When writing SQL, there is often a combination of fields for a column, such as listing the salary per month in someone's name, but only one line per person. A scenario like this can be implemented with row and column conversions, but if the information for this month is not fixed, the row