query functions

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EJB3 QL Query

Label:Http://www.blogjava.net/liaojiyong/archive/2008/07/11/56216.htmlEJB3 QL QueryThe query language of EJB3 is an intermediate and object-like query language that is very similar to SQL. It can be compiled into SQL that can be accepted by

ThinkPHP3.1 Quick Start (3) Query Language

In the previous article we have mastered the basic data curd method, but in more cases, due to the differences in business logic, curd operations are often not so simple, especially complex business logic below, this is the ActiveRecord mode of defic

ThinkPHP3.1 Query Language Detailed _php example

thinkphp query Language with coherent operation can be very good to solve the complex business logic requirements, this article we first to in-depth understanding of the framework of the query language. 1. Query Language Introduction thinkphp built

thinkphp Query, 3.X 5.0 method

The following small series for everyone to bring a thinkphp query, 3.X 5.0 method (pro-test feasible). Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it with a little knitting. First,

Detailed Mysql basic query, connection query, subquery, regular expression query _mysql

Query data refers to obtaining the required data from the database. Query data is the most commonly used and most important operation in database operations. Users can use different query methods according to their needs for the data. Different data

MyBatis Advanced Mapping and query caching _java

MyBatis Framework Execution Process: 1, configuration mybatis configuration file, Sqlmapconfig.xml (name is not fixed)2, through the configuration file, load MyBatis running environment, create sqlsessionfactory session factorySqlsessionfactory in t

Query API for Queries and EJB QL (query and EJB QL)

Chapter 9. Queries and EJB QL (query and EJB QL) Querying is a fundamental feature the all relational databases. It allows to pull complex reports, calculations, and information about intricately (messy) related objects from Persisten CE storage. Qu

High-performance MySQL reading notes-query cache

Tags: MySQL query cache cache fragment Preheating1 , MySQL query cacheMany database products are able to cache the execution plan of a query, and the SQL parsing and execution plan generation phases can be skipped for the same type of SQL. MySQL

Hibernate Framework Learning Data query (HQL)

Tags: improve mode implementation TCO RGB basic data use technology share skillLhibernate a total of 5 query methods? OID Data Query method? HQL Data Query method? QBC Data Query method? Local SQL Query method? Ogn Data Query methodOID Data Query

Numerical functions, character functions, date functions, conversion functions and their application in query statements of Oracle database built-in functions

Tags: Numeric functions: 1, rounding function round () from dual: A row of a column composed of select round (23.4) from dual;--default not write M for M for 0select round (23.45,1) from dual;-- 1 means to keep one digit after the decimal point,

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