ZzSQLHelper
Github传送门:https://github.com/zhouzhuo810/ZzSQLHelper 欢迎star
A powerful sqlite framework that supports ORM and Cursor mode.
(一个简单却强大的数据库封装工具。)
· 支持ORM和Cursor两种操作模式;
Gradle:
compile 'me.zhouzhuo.zzsqlhelper:zz-sql-helper:1.0.3'
(注意:1.0.0-1.0.2有个小bug,推荐使用最新版)
Maven:
<dependency>
<groupId>me.zhouzhuo.zzsqlhelper</groupId>
<artifactId>zz-sql-helper</artifactId>
<version>1.0.3</version>
<type>pom</type>
</dependency>
推荐用法:
定义一个单例模式工具类(完成数据库配置、建表和数据库升级操作):
public class DbUtils {
private static ZzSqlHelper helper;
private DbUtils() {
}
public static ZzSqlHelper getInstance(Context context) {
if (helper == null) {
synchronized (DbUtils.class) {
if (helper == null) {
helper = new ZzSqlHelper.Builder()
.setDbName("hello")
.setVersion(13)
// .addTableSql("create table if not exists student (id integer primary key , name varchar, phone varchar)")
.addTableEntity(TestEntity.StudentEntity.class)
.setUpgradeListener(new ZzSqlHelper.Builder.UpgradeListener() {
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
if (oldVersion != 0 && db != null && db.isOpen()) {
db.execSQL("drop table studententity");
}
}
})
.create(context);
}
}
}
return helper;
}
}
日志打印:
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Logger.enable(true);
}
}
ORM模式:
1.定义实体类,表名就是实体类名, 字段名就是属性名,
使用@Column()注解可以控制字段是否保存和获取
public static class StudentEntity {
//id是必须加的字段
private int id;
//save=false时,不保存和读取该字段
@Column(save = false)
private String name;
//默认save=true
@Column()
private String phone;
//... getter and setter
}
增:
//实体类
TestEntity.StudentEntity studentEntity = new TestEntity.StudentEntity();
studentEntity.setName("hello");
studentEntity.setPhone("123");
studentEntity.setMan(true);
//保存实体类到数据库
DbUtils.getInstance(this).save(studentEntity);
//多个实体类可以用saveAll(List<Entity> list)方法。
删
//条件删除
DbUtils.getInstance(this).delete(TestEntity.StudentEntity.class,
new ZzSqlHelper.WhereBuilder("name","==","hello"));
//根据id删除某行
DbUtils.getInstance(this).deleteById(TestEntity.StudentEntity.class, 2);
//删除整个表
DbUtils.getInstance(this).deleteAll(TestEntity.StudentEntity.class);
查
//条件查询
String sql2 = new SQLBuilder()
.from(TestEntity.StudentEntity.class)
.select()
.build();
List<TestEntity.StudentEntity> students = DbUtils.getInstance(this)
.findAll(TestEntity.StudentEntity.class, sql2);
//根据id查询
TestEntity.StudentEntity entity = DbUtils.getInstance(this)
.findById(TestEntity.StudentEntity.class, 1);
//查询表中所有数据
List<TestEntity.StudentEntity> datas = DbUtils.getInstance(this)
.findAll(TestEntity.StudentEntity.class);
改
//传入实体类对象和要更新的字段名,传null更新全部字段。
entity.setMan(true);
entity.setPhone("555");
DbUtils.getInstance(this)
.update(entity, "phone", "isMan");
Cursor模式:
增
SQLBuilder b = new SQLBuilder();
String sql = b.from(TestEntity.StudentEntity.class)
.insert(new String[]{"name", "phone"}, new String[]{"tt", "yy"})
.build();
DbUtils.getInstance(this).execSQL(sql);
删
String sql = new SQLBuilder()
.from(TestEntity.StudentEntity.class)
.delete()
.where("name", "=", "tt")
.build();
DbUtils.getInstance(this).execSQL(sql);
查
String sql = new SQLBuilder()
.from(TestEntity.StudentEntity.class)
.select()
.build();
Cursor cursor = DbUtils.getInstance(MainActivity.this).findAll(sql);
while (cursor.moveToNext()) {
Log.e("xxx", "id=" + cursor.getString(cursor.getColumnIndex("id")));
Log.e("xxx", "name=" + cursor.getString(cursor.getColumnIndex("name")));
Log.e("xxx", "phone=" + cursor.getString(cursor.getColumnIndex("phone")));
Log.e("xxx", "isMan=" + cursor.getInt(cursor.getColumnIndex("isMan")));
}
cursor.close();
改
SQLBuilder b = new SQLBuilder();
String sql = b.from(TestEntity.StudentEntity.class)
.update(new String[]{"phone"}, new String[]{"4343"})
.where("id", "=", 1)
.build();
DbUtils.getInstance(this).execSQL(sql);
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