Oracle

Currently in. NET scope, good and convenient ORM is really not many, and the integration with VS convenient is also the EntityFramework (hereinafter referred to as EF, do not know why, total EF This abbreviation is not professional). However, many

Paradigm: The English name is the Normal Form, it is the British e.f.codd (relational database ancestor) in the 70 's to put forward a relational database model, the paradigm is the basis of relational database theory, but also we in the design of

1. Create a folder resource and forms to store the PLL and forms (mainly used in APSTAND.FMB, APPSTAND.FMB, template.fmb) files;2. Modify the Registration FormHkey_local_machine/software/oracleValue Name: Nls_langValue: American_america.

Today comes into contact with a more interesting question, common to extremely easy to ignore, but inadvertently fell out of the pit and not easy to come out.To create a table:CREATE TABLE Temp_decode (Borrow_type char (1), Borrow_type1 char (2),

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Delete the name of the table (record and structure) Delete ———— truncate ———— dropDelete (deletes the statement recorded in the data table)DELETE from table name WHERE condition;Note: Deleting a record does not release the block table space that is

--View the Oracle database character set:Select Userenv (' language ') from dual;Query Result:Simplified Chinese_china. Al32utf8--Modifying the Oracle Database Character set: (In SQL Plus)Sql> Conn/as sysdba;sql> shutdown immediate;Database

Organize some of the commonly used intercept and find character functions:1. Find the number of occurrences of a character (string) in a stringSELECT LENGTH (regexp_replace (' Annelilyjane ', ' ', ' @ '), ' [^@]+ ', ') ') COUNT from DUAL; --Return 2

Yesterday saw a post about the failure of the object recompilation problem, and then found themselves in the company also appeared inexplicable failure object.--Create an automatic compilation invalidation process transaction log table declare

The JDBC maven dependency for MySQL and Oracle are as follows: MySQL - Dependency> groupId>MysqlgroupId> Artifactid>Mysql-connector-javaArtifactid> version>5.1.36version> Dependency> Oracle - Dependency>

The process of operation and maintenance is a process that constantly produces new problems and needs to be researched and moved forward. 11 holidays just before the customer calls to inform the Oracle synchronization data inconsistencies need to be

Sequences, triggers, and other related usesSQL Server under Microsoft grows as long as the set column identityCreate Table intIdentity(1,1primarykey not Nullvarchar();MySQL to achieve self-growth as long as the set column auto_incrementCreate Table

1, to unlock the userAlter user Scott account unlock;2, log off, disconnect, switch the current user connectionQuitConn Scott/tiger3, User rights queryA. View all Users:SELECT * from Dba_users;SELECT * from All_users;SELECT * from User_users;B. View

2015-10-13DirectoryFirst, the principle of connectionSecond, service-side configuration1. Dynamic Registration2. Static RegistrationThird, client configuration1. Local naming2. Simple namingFour, the connection method1. Shared connections2.

Obtain corresponding information from dateCreate a test table: Create or replace view v ASSELECT TO_DATE ('2017-5-5 13:14:15 ', 'yyyy-MM-DD HH24: MI: ss') AS c from dual; SELECT * FROM v;  The SQL code is as follows: When SELECT c, TO_CHAR (c, '

Auxiliary SQL statements for oracle Database optimization, oraclesql For details, see the code analysis below. -- Query the SQL statement that is being executed. SELECT the OSUSER computer logon identity, the PROGRAM where the PROGRAM initiates the

Node trust error caused by excessive rac _/home/oracle Permissions Background: RAC Oracle 11.2.0.4, a database exists, and a new database is created on this basis. Problem: When dbca creates a database, the trust relationship between nodes fails,

Oracle storage process, job, view, trigger (poor memory, write your own example), oraclejob Stored Procedure 1 create or replace procedure TestPro (Descerr out varchar2) is2 begin3 select * from test; 4 exception5 when others then6 Descerr: =

ORACLE_JDBC operation instructions and code examplesJDBC: // JDBC basic operation steps: 1 load the driver 2 get the link object 3 link 4 transfer data, database processing, accept data result set 5 process result set 6 close the resource // Add: 1.

Simple ORACLE Statement (add, delete, modify, and query) and code example// Create user c # name identified by password; // naming rule: 1 Name must start with a letter, 2 length cannot exceed 30 characters (60 bytes ), 3 cannot use oracle reserved