2

我将用 sqlite 编写一个示例代码,它必须同时适用于 Android 和 IOS(以及桌面)

这是我的build.gradle

  buildscript {
    repositories {
        jcenter()
        mavenCentral()
        maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
    }
    dependencies { classpath 'org.javafxports:jfxmobile-plugin:1.0.6' }
}
apply plugin: 'org.javafxports.jfxmobile'
repositories {
    jcenter()
    mavenCentral()
    maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
    maven { url 'https://oss.sonatype.org/content/repositories/releases' }
}
ext.CHARM_DOWN_VERSION = "1.0.0"
dependencies {
    compile 'mysql:mysql-connector-java:3.1.12'

    //compile 'org.xerial:sqlite-jdbc:3.9.0-SNAPSHOT'

    compile 'org.sqldroid:sqldroid:1.0.3'
    compile "com.gluonhq:charm-down-common:$CHARM_DOWN_VERSION"
    desktopRuntime "com.gluonhq:charm-down-desktop:$CHARM_DOWN_VERSION"

    //desktopRuntime 'org.xerial:sqlite-jdbc:3.9.0-SNAPSHOT'

    androidRuntime "com.gluonhq:charm-down-android:$CHARM_DOWN_VERSION"
    androidRuntime 'org.sqldroid:sqldroid:1.0.3'

    iosRuntime "com.gluonhq:charm-down-ios:$CHARM_DOWN_VERSION"
}
mainClassName = 'com.version17.Version17'
jfxmobile {
    android {
        manifest = 'src/android/AndroidManifest.xml'
        packagingOptions {
            exclude 'META-INF/INDEX.LIST'
        }
    }
    ios {
        infoPList = file('src/ios/Default-Info.plist')
        forceLinkClasses = ['com.version17.**.*', 'com.mysql.**.*', 'SQLite.**.*', 'com.gluonhq.**.*']
    }
}

sqliteHelper.java

public static void testSqli() throws SQLException, ClassNotFoundException{
    Class.forName("SQLite.JDBCDriver");

    String dbName = "mtt8.db";
    File dir = null;
    try {
        dir = PlatformFactory.getPlatform().getPrivateStorage();
    } catch (IOException e) {
        e.printStackTrace();
    }

    File db = new File (dir, dbName);
    String dbUrl = "jdbc:sqlite:" + db.getAbsolutePath();




    Connection conn = DriverManager.getConnection(dbUrl);

    //create table
    Statement st=null;

        st = conn.createStatement();
        st.executeUpdate("DROP TABLE IF EXISTS village;");
    st.executeUpdate("CREATE table village (id int, name varchar(20))");
        //insert row
    for (int i=0; i<50; i++){
        st.executeUpdate("INSERT INTO village VALUES (" +i+ ", 'Erkan Kaplan')");
    }


    //select
    String query = "SELECT id, name from village";
    ResultSet rs = null;

            rs = st.executeQuery(query);

            while(rs.next()) {
                int id = 0;
                id = rs.getInt(1);

                String name = null;

                    name = rs.getString(2);

                System.out.println("id:"+ id+ ", name: "+ name);
            st.executeUpdate("DELETE from village");
            rs.close();

    }

}

这适用于 Ipad 设备和桌面,但不适用于 Android 设备(如三星平板电脑)。

谁能告诉我为什么上面的代码不适用于三星平板电脑?或者我必须在我的代码中添加哪个?

感谢 Erkan Kaplan

4

1 回答 1

2

您可以为每个平台加载所需的驱动程序,并使用 Gluon Charm-Down了解平台并加载它。

在您的 IDE 上使用 Gluon插件,在build.gradle文件中很容易根据平台添加不同的依赖项。

编辑

还添加了桌面。

对于桌面,我们可以使用org.sqlite.JDBC,对于 Android,我们可以使用org.sqldroid.SQLDroidDriver. 对于 iOS,不需要依赖,因为SQLite.JDBCDriver它已经包含在 Robovm 中。

repositories {
    jcenter()
    maven { 
        url 'https://oss.sonatype.org/content/repositories/snapshots' 
    }
}

ext.CHARM_DOWN_VERSION = "1.0.0"

dependencies{
    compile "com.gluonhq:charm-down-common:$CHARM_DOWN_VERSION"

    desktopRuntime "com.gluonhq:charm-down-desktop:$CHARM_DOWN_VERSION"
    desktopRuntime 'org.xerial:sqlite-jdbc:3.9.0-SNAPSHOT'

    androidRuntime "com.gluonhq:charm-down-android:$CHARM_DOWN_VERSION"
    androidRuntime 'org.sqldroid:sqldroid:1.0.3'

    iosRuntime "com.gluonhq:charm-down-ios:$CHARM_DOWN_VERSION"
}

但是我们需要将它添加到forceLinkClasses选项中:

jfxmobile {
    android {
        manifest = 'src/android/AndroidManifest.xml'
    }

    ios {
        forceLinkClasses = [ 'your.package.**.*', 'SQLite.**.*']
        infoPList = file('src/ios/Default-Info.plist')
    }
}

现在,在您的代码中,您可以根据应用程序运行的平台加载一个或另一个驱动程序,并创建一个连接,提供如下所述的本地路径

private void testSqli() throws SQLException, ClassNotFoundException {

    if (JavaFXPlatform.isAndroid()) {
        Class.forName("org.sqldroid.SQLDroidDriver");
    } else if (JavaFXPlatform.isIOS()) {
        Class.forName("SQLite.JDBCDriver");
    } else if (JavaFXPlatform.isDesktop()) {
        Class.forName("org.sqlite.JDBC");
    }

    File dir;
    String dbUrl = "jdbc:sqlite:";
    try {
        dir = PlatformFactory.getPlatform().getPrivateStorage();
        String dbName = "yourDatabase.db";
        File db = new File (dir, dbName);
        dbUrl = dbUrl + db.getAbsolutePath();
        Connection conn = DriverManager.getConnection(dbUrl);
        ...
    } catch (IOException ex) { }
}

现在您应该可以在桌面、Android 和 iOS 上运行它了。我已经用 NetBeans 和 IntelliJ 对它们三个进行了测试,但前者比后者更好地管理平台依赖关系。

于 2015-11-11T17:27:39.370 回答