Oracle

Import Java. SQL. *; public class testjdbc {public static void main (string [] ARGs) {resultset rs = NULL; statement stmt = NULL; connection conn = NULL; try {class. forname ("oracle. JDBC. driver. oracledriver "); // new Oracle. JDBC. driver.

Use PL/SQL to connect to Oracle without installing the Oracle client 1. Download a software named Instant Client package from the Oracle website. This software does not need to be installed and can be used as long as it is decompressed. :

I am wrong. I am really wrong... accidentally cleared the content of the four basic data tables... Now N more screams... Contact Se, and Se made a flash back... directly back to the time point before the operation... really handsome... keep the

Key: Oracle for update row lockThe syntax of the Select... for update statement is as follows:Select... for update [of column_list] [Wait n | Nowait] [Skip locked];Where:The of clause is used to specify the columns to be updated, that is, to lock

Constraints:It is used to ensure that database data meets specific business rules.Restrictions in Oracle include:Not NULL:Unique:Primary Key: PKForeign key: FKCheck:A. Not NULL: non-null constraint:If not null is defined in a column, data must be

Three default accounts: For Oracle 9:Sys change_on_install Network Administrator [as sysdba]System manage local administratorScott tiger is locked by default and can be used only after being unlocked. For Oracle 10: Sys and system do not have a

Regular Expression At present, regular expressions have been widely used in many software applications, including * nix (Linux, UNIX, etc.), HP and other operating systems, PHP, C #, Java and other development environments. Oracle 10g Regular

First download the installation package... Address: This http://download.oracle.com/otn/nt/oracle10g/10201/10201_database_win32.zip Of course, the default installation package does not support Windows 7 and visata. So we must change the following

First create auto-increment index .... Create sequence archive_seqMinvalue 1 Max value 99999999999999 Start with 1 Increment by 1 Cache 20 Order; Next... create a trigger for each table Create or replace trigger archive_tgBefore insert on

-- Do not mix up the sequence... -- 1. Create a tablespace --Create tablespace sfwebloggingdatafile 'C: \ oracle \ product \ 10.2.0 \ oradata \ orcl \ sfweb. DBF 'size 32 m autoextend on next 32 m maxsize 2048 mextent management local; -- 2. create

Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Stringbuilder strconn = new stringbuilder (); Strconn. append ("Data Source = (description = ");Strconn. append ("(address_list = (address =

Oracle deletes a column of duplicate rows in the table Table Name: T4 Create Table Test. T4(ID number (10 ),Firstname varchar2 (50 char ),Lastname varchar2 (50 char)) The ID is the primary key, and all rows with duplicate IDs are deleted (no matter

1. Oracle Oraclecommand COM = new oraclecommand (@ "select * From ibs_user where username =: uname and userpwd =: upwd", Conn );Com. Parameters. Add (": uname", oracletype. varchar). value = username. Text. Trim ();Com. Parameters. Add (": upwd",

  Oracle job sample executed at every day DeclareX number;BeginSYS. dbms_job.submit(Job => X, What => 'syn _ rpt_members_relation ;', Next_date => to_date ('02-07-200801: 00: 00', 'dd/mm/yyyy hh24: MI: ss '), Interval => 'trunc (sysdate) + 1 +1/24',

   Declare V_ SQL varchar2 (1000 ); Cursor cur is select 'alter table "'| t1.table _ name |'" RENAME to '| Upper (t1.table _ name) as sqlstr From user_tables T1 Where table_name <> upper (table_name) And not exists (select 1 from user_tables T2

Document directory 2. Usage of case when in different positions in the statement Difference in isnull syntax between SQL Server and Oracle case when else Isnull () in sqlserver ()Nvl () in Oracle ()Nvl (expr1, expr2) If expr1 is null, the value

Technorati label: Oracle Oracle uses utl_file packageCreate or replace procedure loadfiledata (p_path varchar2, p_filename varchar2) isV_filehandle utl_file.file_type; -- defines a file handle.V_text varchar2 (100); -- stores textV_name test. name %

Technorati label: Oracle Start with DBA _Dba_usersDatabaseUser InformationDba_segments table segment informationDba_extents data zone informationDba_objects database object informationDba_tablespaces database tablespace InformationDba_data_files

OracleHow to display all current user tables Show all tables of a user (for example, Scott, uppercase is required) Select table_name from all_tables where owner = 'Scott '; Show all current user tables Select * From user_tables Display All Tables of

1. Download Go to http://www.oracle.com/policy/software/tech/oci/instantclient/index.htmlto download the installation program of the latest version. 2. decompress the package to the local device. For example, unzip the package to D: \