ORMLiteDatabase的简单使用并且与其他的表相互联系

1、下载jar

具体到Android，需要在 http://ormlite.com/releases 页面下载两个jar 包（本文基于ORMLite的版本是：ormlite 4.49-SNAPSHOT）：
（1）core列表下的jar包；
（2）android列表下的jar包。
如图所示：

将上面的两个jar包下载后放到Android工程项目中的libs包中，如图所示：

以上完成后，ORMLite开发环境搭建就完成了，接下来就可以使用了。

2、代码：

表student.java和AClass.java

 package com.zzw.ormlitedatabasetest;

 import com.j256.ormlite.field.DatabaseField;
 import com.j256.ormlite.table.DatabaseTable;

 @DatabaseTable(tableName = "Student")
 public class Student {

     @DatabaseField(id = true, columnName = "Student_id")
     public int Student_id;
     @DatabaseField(columnName = "name")
     public String name;
     @DatabaseField(columnName = "sex")
     public String sex;
     @DatabaseField(columnName = "age")
     public int age;
     @DatabaseField(foreign = true, foreignAutoRefresh = true)
     public AClass aClass;

     public Student() {

     }

     public Student(String name, String sex, int age) {
         super();
         this.name = name;
         this.sex = sex;
         this.age = age;
     }

     @Override
     public String toString() {
         return "Student [Student_id=" + Student_id + ", name=" + name + ", sex=" + sex + ", age=" + age + ",className="
                 + aClass.name + "]";
     }

 }

Student

 package com.zzw.ormlitedatabasetest;

 import com.j256.ormlite.dao.ForeignCollection;
 import com.j256.ormlite.field.DataType;
 import com.j256.ormlite.field.DatabaseField;
 import com.j256.ormlite.field.ForeignCollectionField;
 import com.j256.ormlite.table.DatabaseTable;

 @DatabaseTable(tableName = "Classess")
 public class AClass {

     @DatabaseField(id = true, columnName = "classess_id")
     public int classess_id;
     @DatabaseField(dataType = DataType.STRING)
     public String name;
     @ForeignCollectionField(eager = false)
     public ForeignCollection<Student> students = null;

     public AClass() {
         super();
     }

     public AClass(int classess_id, String name, ForeignCollection<Student> students) {
         super();
         this.classess_id = classess_id;
         this.name = name;
         this.students = students;
     }

 }

AClass

ORMLite数据库管理工具类ORMLiteDatabaseHelper.java：

 package com.zzw.ormlitedatabasetest;

 import java.sql.SQLException;

 import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
 import com.j256.ormlite.dao.Dao;
 import com.j256.ormlite.support.ConnectionSource;
 import com.j256.ormlite.table.TableUtils;

 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteDatabase.CursorFactory;
 import android.util.Log;

 public class OrmLiteDatabaseHelper extends OrmLiteSqliteOpenHelper {
     private static final String TAG = "OrmLiteDatabaseHelper";

     public static OrmLiteDatabaseHelper mDatabaseHelper = null;

     public Dao<Student, Integer> mStudentDao = null;
     public Dao<AClass, Integer> mAClassDao = null;

     public static String database_NAME = "school.db";
     public static int database_VERSION = 1;

     public OrmLiteDatabaseHelper(Context context, String databaseName, CursorFactory factory, int databaseVersion) {
         super(context, databaseName, factory, databaseVersion);
     }

     public static OrmLiteDatabaseHelper getInstance(Context context) {
         if (mDatabaseHelper == null) {
             mDatabaseHelper = new OrmLiteDatabaseHelper(context, database_NAME, null, database_VERSION);
         }
         Log.d(TAG, "数据库school.db创建成功");
         return mDatabaseHelper;
     }

     @Override
     public void onCreate(SQLiteDatabase arg0, ConnectionSource arg1) {
         try {
             TableUtils.createTableIfNotExists(arg1, AClass.class);
             Log.e(TAG, "AClass表在School.db中被创建");
             TableUtils.createTableIfNotExists(arg1, Student.class);
             Log.e(TAG, "Student表在School.db中被创建");
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }

     @Override
     public void onUpgrade(SQLiteDatabase arg0, ConnectionSource arg1, int arg2, int arg3) {

     }

     public Dao<Student, Integer> getStudentDao() {
         if (mStudentDao == null) {
             try {
                 mStudentDao = getDao(Student.class);
                 Log.e(TAG, "得到Student的Dao");
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         return mStudentDao;
     }

     public Dao<AClass, Integer> getAClassDao() {
         if (mAClassDao == null) {
             try {
                 mAClassDao = getDao(AClass.class);
                 Log.e(TAG, "得到AClass的Dao");
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         return mAClassDao;
     }

     @Override
     public void close() {
         super.close();
         if (mAClassDao != null) {
             mAClassDao = null;
         }
         if (mStudentDao != null) {
             mStudentDao = null;
         }
     }
 }

MainActivity:

 package com.zzw.ormlitedatabasetest;

 import java.sql.SQLException;
 import java.util.List;

 import com.j256.ormlite.dao.Dao;

 import android.app.Activity;
 import android.graphics.Color;
 import android.os.Bundle;
 import android.util.Log;
 import android.widget.ScrollView;
 import android.widget.TextView;
 import android.widget.Toast;

 public class MainActivity extends Activity {

     private static final String TAG = "MainActivity";

     private Dao<AClass, Integer> mAClassDao = null;
     private Dao<Student, Integer> mStudentDao = null;

     AClass aClass1, aClass2, aClass3, aClass4, aClass5;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         OrmLiteDatabaseHelper mOrmLiteDatabaseHelper = OrmLiteDatabaseHelper.getInstance(this);

         mAClassDao = mOrmLiteDatabaseHelper.getAClassDao();
         mStudentDao = mOrmLiteDatabaseHelper.getStudentDao();

     }

     @Override
     protected void onStart() {
         Log.d(TAG, ">>>>>>>>>>>>");
         super.onStart();
         int AClasses_count = createAClasses();
         if (AClasses_count == 5) {
             try {
                 aClass1 = mAClassDao.queryForId(1);
                 aClass2 = mAClassDao.queryForId(2);
                 aClass3 = mAClassDao.queryForId(3);
                 aClass4 = mAClassDao.queryForId(4);
                 aClass5 = mAClassDao.queryForId(5);

                 createStudents();

             } catch (Exception e) {
                 e.printStackTrace();
             }
         } else {
             Toast.makeText(this, "班级创建错误", 0).show();
         }
         queryAllStudents();
     }

     private void createStudents() {
         Log.d(TAG, "学生创建开始------>");
         Student student = new Student();
         for (int i = 1; i <= 20; i++) {
             student.Student_id = i;
             student.age = (int) (Math.random() * 100);
             if (i % 2 == 0) {
                 student.sex = "男";
             } else {
                 student.sex = "女";
             }
             if (i > 0 && i <= 4) {
                 student.aClass = aClass1;
                 student.name = "陶" + i;
             } else if (i > 4 && i <= 8) {
                 student.aClass = aClass2;
                 student.name = "李" + i;
             } else if (i > 8 && i <= 12) {
                 student.aClass = aClass3;
                 student.name = "阿" + i;
             } else if (i > 12 && i <= 16) {
                 student.aClass = aClass4;
                 student.name = "曾" + i;
             } else {
                 student.aClass = aClass5;
                 student.name = "蒋" + i;
             }

             try {
                 mStudentDao.createIfNotExists(student);
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         Log.d(TAG, "学生创建成功------>");
     }

     private int createAClasses() {
         Log.d(TAG, "班级创建开始------>");
         AClass aClass = new AClass();
         int AClasses_count = 0;
         for (int i = 1; i <= 5; i++) {
             aClass.classess_id = i;
             aClass.name = "高三" + i + "班";
             try {
                 mAClassDao.createIfNotExists(aClass);
                 AClasses_count++;
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
         Log.d(TAG, "班级创建成功------>");
         return AClasses_count;
     }

     private void queryAllStudents() {
         Log.d(TAG, "查询全部学生开始------>>>>");
         try {
             List<Student> students = mStudentDao.queryForAll();
             if (students != null && students.size() > 0) {
                 for (Student student : students) {
                     Log.i(TAG, student.toString());
                 }
             }
         } catch (SQLException e) {
             e.printStackTrace();
         }
         Log.d(TAG, "查询全部学生完毕------>>>>");
     }

     @Override
     protected void onDestroy() {
         super.onDestroy();
         if (mAClassDao != null) {
             mAClassDao = null;
         }
         if (mStudentDao != null) {
             mStudentDao = null;
         }
         Log.d(TAG, "<<<<<<<<<<<");
     }

 }