Enca: Minimal Cgo Bindings for Libenca

enca 

This is a minimal cgo bindings for libenca.

If you need to detect the language of a string you can use guesslanguage package.

Supported Go versions

enca is tested against Go 1.0, 1.1, 1.2, 1.3 and tip.

Usage

Install libenca to your system:

$ sudo apt-get install libenca0 libenca-dev

Install in your ${GOPATH} using go get -u github.com/endeveit/enca

Then call it:

package main

import (
    "fmt"
    "github.com/endeveit/enca"
)

func main() {
    analyzer, err := enca.New("zh")

    if err == nil {
        encoding, err := analyzer.FromString("美国各州选民今天开始正式投票。据信,", enca.NAME_STYLE_HUMAN)
        defer analyzer.Free()

        // Output:
        // UTF-8
        if err == nil {
            fmt.Println(encoding)
        }
    }
}

Documentation

godoc is available here.

Author: Endeveit
Source Code: https://github.com/endeveit/enca 
License: MIT License

#go #golang 

What is GEEK

Buddha Community

Enca: Minimal Cgo Bindings for Libenca

Apache Cayenne | Mirror Of Apache Cayenne Written in Java

Apache Cayenne

Apache Cayenne is an open source persistence framework licensed under the Apache License, providing object-relational mapping (ORM) and remoting services.

Quick Start

Create XML mapping

Modeler GUI application

You can use Cayenne Modeler to manually create Cayenne project without DB. Binary distributions can be downloaded from https://cayenne.apache.org/download/

Modeler

See tutorial https://cayenne.apache.org/docs/4.2/getting-started-guide/

Maven plugin

Additionally, you can use Cayenne Maven (or Gradle) plugin to create model based on existing DB structure. Here is example of Cayenne Maven plugin setup that will do it:

<plugin>
    <groupId>org.apache.cayenne.plugins</groupId>
    <artifactId>cayenne-maven-plugin</artifactId>
    <version>4.2.RC1</version>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.29</version>
        </dependency>
    </dependencies>

    <configuration>
        <map>${project.basedir}/src/main/resources/demo.map.xml</map>
        <cayenneProject>${project.basedir}/src/main/resources/cayenne-demo.xml</cayenneProject>
        <dataSource>
            <url>jdbc:mysql://localhost:3306/cayenne_demo</url>
            <driver>com.mysql.cj.jdbc.Driver</driver>
            <username>user</username>
            <password>password</password>
        </dataSource>
        <dbImport>
            <defaultPackage>org.apache.cayenne.demo.model</defaultPackage>
        </dbImport>
    </configuration>
</plugin>

Run it:

mvn cayenne:cdbimport
mvn cayenne:cgen

See tutorial https://cayenne.apache.org/docs/4.2/getting-started-db-first/

Gradle plugin

And here is example of Cayenne Gradle plugin setup:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath group: 'org.apache.cayenne.plugins', name: 'cayenne-gradle-plugin', version: '4.2.RC1'
        classpath 'mysql:mysql-connector-java:8.0.29'
    }
}

apply plugin: 'org.apache.cayenne'
cayenne.defaultDataMap 'demo.map.xml'

cdbimport {   
    cayenneProject 'cayenne-demo.xml'

    dataSource {
        driver 'com.mysql.cj.jdbc.Driver'
        url 'jdbc:mysql://127.0.0.1:3306/cayenne_demo'
        username 'user'
        password 'password'
    }

    dbImport {
        defaultPackage = 'org.apache.cayenne.demo.model'
    }
}

cgen.dependsOn cdbimport
compileJava.dependsOn cgen

Run it:

gradlew build

Include Cayenne into project

Maven

<dependencies>
    <dependency>
        <groupId>org.apache.cayenne</groupId>
        <artifactId>cayenne-server</artifactId>
        <version>4.2.RC1</version>
    </dependency>
</dependencies>

Gradle

compile group: 'org.apache.cayenne', name: 'cayenne-server', version: '4.2.RC1'
 
// or, if Gradle plugin is used
compile cayenne.dependency('server')

Create Cayenne Runtime

ServerRuntime cayenneRuntime = ServerRuntime.builder()
    .addConfig("cayenne-demo.xml")
    .dataSource(DataSourceBuilder
             .url("jdbc:mysql://localhost:3306/cayenne_demo")
             .driver("com.mysql.cj.jdbc.Driver")
             .userName("username")
             .password("password")
             .build())
    .build();

Create New Objects

ObjectContext context = cayenneRuntime.newContext();

Artist picasso = context.newObject(Artist.class);
picasso.setName("Pablo Picasso");
picasso.setDateOfBirth(LocalDate.of(1881, 10, 25));

Gallery metropolitan = context.newObject(Gallery.class);
metropolitan.setName("Metropolitan Museum of Art");

Painting girl = context.newObject(Painting.class);
girl.setName("Girl Reading at a Table");

Painting stein = context.newObject(Painting.class);
stein.setName("Gertrude Stein");

picasso.addToPaintings(girl);
picasso.addToPaintings(stein);

girl.setGallery(metropolitan);
stein.setGallery(metropolitan);

context.commitChanges();

Queries

Select Objects

List<Painting> paintings = ObjectSelect.query(Painting.class)
        .where(Painting.ARTIST.dot(Artist.DATE_OF_BIRTH).year().lt(1900))
        .prefetch(Painting.ARTIST.joint())
        .select(context);

Aggregate functions

// this is artificial property signaling that we want to get full object
Property<Artist> artistProperty = Property.createSelf(Artist.class);

List<Object[]> artistAndPaintingCount = ObjectSelect.columnQuery(Artist.class, artistProperty, Artist.PAINTING_ARRAY.count())
    .where(Artist.ARTIST_NAME.like("a%"))
    .having(Artist.PAINTING_ARRAY.count().lt(5L))
    .orderBy(Artist.PAINTING_ARRAY.count().desc(), Artist.ARTIST_NAME.asc())
    .select(context);

for(Object[] next : artistAndPaintingCount) {
    Artist artist = (Artist)next[0];
    long paintingsCount = (Long)next[1];
    System.out.println(artist.getArtistName() + " has " + paintingsCount + " painting(s)");
}

Raw SQL queries

// Selecting objects
List<Painting> paintings = SQLSelect
    .query(Painting.class, "SELECT * FROM PAINTING WHERE PAINTING_TITLE LIKE #bind($title)")
    .params("title", "painting%")
    .upperColumnNames()
    .localCache()
    .limit(100)
    .select(context);

// Selecting scalar values
List<String> paintingNames = SQLSelect
    .scalarQuery(String.class, "SELECT PAINTING_TITLE FROM PAINTING WHERE ESTIMATED_PRICE > #bind($price)")
    .params("price", 100000)
    .select(context);

// Insert values
int inserted = SQLExec
    .query("INSERT INTO ARTIST (ARTIST_ID, ARTIST_NAME) VALUES (#bind($id), #bind($name))")
    .paramsArray(55, "Picasso")
    .update(context);

Documentation

Getting Started

https://cayenne.apache.org/docs/4.2/getting-started-guide/

Getting Started Db-First

https://cayenne.apache.org/docs/4.2/getting-started-db-first/

Full documentation

https://cayenne.apache.org/docs/4.2/cayenne-guide/

JavaDoc

https://cayenne.apache.org/docs/4.2/api/

About

With a wealth of unique and powerful features, Cayenne can address a wide range of persistence needs. Cayenne seamlessly binds one or more database schemas directly to Java objects, managing atomic commit and rollbacks, SQL generation, joins, sequences, and more.

Cayenne is designed to be easy to use, without sacrificing flexibility or design. To that end, Cayenne supports database reverse engineering and generation, as well as a Velocity-based class generation engine. All of these functions can be controlled directly through the CayenneModeler, a fully functional GUI tool. No cryptic XML or annotation based configuration is required! An entire database schema can be mapped directly to Java objects within minutes, all from the comfort of the GUI-based CayenneModeler.

Cayenne supports numerous other features, including caching, a complete object query syntax, relationship pre-fetching, on-demand object and relationship faulting, object inheritance, database auto-detection, and generic persisted objects. Most importantly, Cayenne can scale up or down to virtually any project size. With a mature, 100% open source framework, an energetic user community, and a track record of solid performance in high-volume environments, Cayenne is an exceptional choice for persistence services.

Collaboration

Download Details:
Author: apache
Source Code: https://github.com/apache/cayenne
License:

#java

Nigel  Uys

Nigel Uys

1657020254

Enca: Minimal Cgo Bindings for Libenca

enca

This is a minimal cgo bindings for libenca.

If you need to detect the language of a string you can use guesslanguage package.

Supported Go versions

enca is tested against Go 1.0, 1.1, 1.2, 1.3 and tip.

Usage

Install libenca to your system:

$ sudo apt-get install libenca0 libenca-dev

Install in your ${GOPATH} using go get -u github.com/endeveit/enca

Then call it:

package main

import (
    "fmt"
    "github.com/endeveit/enca"
)

func main() {
    analyzer, err := enca.New("zh")

    if err == nil {
        encoding, err := analyzer.FromString("美国各州选民今天开始正式投票。据信,", enca.NAME_STYLE_HUMAN)
        defer analyzer.Free()

        // Output:
        // UTF-8
        if err == nil {
            fmt.Println(encoding)
        }
    }
}

Documentation

godoc is available here.

Author: Endeveit
Source Code: https://github.com/endeveit/enca 
License: MIT license

#go #golang 

Enca: Minimal Cgo Bindings for Libenca

enca 

This is a minimal cgo bindings for libenca.

If you need to detect the language of a string you can use guesslanguage package.

Supported Go versions

enca is tested against Go 1.0, 1.1, 1.2, 1.3 and tip.

Usage

Install libenca to your system:

$ sudo apt-get install libenca0 libenca-dev

Install in your ${GOPATH} using go get -u github.com/endeveit/enca

Then call it:

package main

import (
    "fmt"
    "github.com/endeveit/enca"
)

func main() {
    analyzer, err := enca.New("zh")

    if err == nil {
        encoding, err := analyzer.FromString("美国各州选民今天开始正式投票。据信,", enca.NAME_STYLE_HUMAN)
        defer analyzer.Free()

        // Output:
        // UTF-8
        if err == nil {
            fmt.Println(encoding)
        }
    }
}

Documentation

godoc is available here.

Author: Endeveit
Source Code: https://github.com/endeveit/enca 
License: MIT License

#go #golang 

Ray  Patel

Ray Patel

1623401100

How to Bind Methods or Constructors to Functional Interfaces

To bind methods or constructors to functional interfaces, we are going to use the FunctionalInterfaceFactory of Burningwave Core library. FunctionalInterfaceFactory component uses to cache all generated functional interfaces for faster access. Before we start coding, we must add the following dependency to our _pom.xm_l:

XML

1

<dependency>2
    <groupId>org.burningwave</groupId>3
    <artifactId>core</artifactId>4
    <version>8.12.6</version>5
</dependency>

Constructors Binding

Methods Binding

Void Methods Binding

Binding to Methods with Boolean Return

Conclusion

#java #method #constructor #binding #functional interface #functional interfaces #binding in java

Annalise  Hyatt

Annalise Hyatt

1598947500

Binding Concept in Javascript

Javascript binding is done using the Bind() method. With the help of the bind method, we can make one common function and bind different objects, so that the function gives different results when its need. otherwise, it gives the same result or gives an error while the code is executing.

In short, when a function or method is invoked, the bind() method allows us to easily set which object will be bound by this keyword.

var info= {

name : "XYZ",
printFunc: function(){
document.write(this.name);} // XYZ
}
info.printFunc();

In the above example, there is no problem accessing the name, this keyword bind the name variable to the function. This is called as default binding.

This keyword will here point to object i.e info object.

var info = {

name : "XYZ",
printFunc: function(){
    document.write(this);// window object or undefined(strict mode).
    document.write(this.name);
  }
}
var printFunc2= info.printFunc;
printFunc2();

In the above example, we are storing a reference of info.printFunc to printFunc2 variable. After that, we are calling it without an object reference, so this will now refer to the window (global) object or undefined (in strict mode). Hence, the binding of this is lost, so no output is produced.

So basically, the Bind() method is used so that binding of this is not lost.

By using bind() method we can set the context of _this or in simple terms we can bind this _to a particular object.


How to use bind?

  1. The bind() method creates a new function, when invoked, has the this sets to the provided value. See example below:-
var car1 = {
  name : "swift",
  color: "red",
}
var car2 = {
  name : "alto",
  color: "blue",
}
function infoFunc() {
   document.write(this.name + " " + this.color + "<br/>");
 }
infoFunc.bind(car1)(); // swift red
infoFunc.bind(car2)(); // alto blue

There is one common function infoFunc() which is invoked 2times with different objects so that different results are produced. This first binds to car1 object and then to car2 object.

2. Function borrowing which means the bind() allows an object to borrow a method from another object without making a copy of that method.

#this-keyword #binding #javascript #front-end-development #call-apply-bind