Xutils3-Dbutils

Posted 2020-09-02 嘉禾世兴

Github源码地址：https://github.com/wyouflf/xUtils3

下面是源码中sample关于Dbutils的使用代码：

import android.view.View;
import android.widget.TextView;

import org.xutils.DbManager;
import org.xutils.common.util.KeyValue;
import org.xutils.db.sqlite.WhereBuilder;
import org.xutils.db.table.DbModel;
import org.xutils.ex.DbException;
import org.xutils.sample.db.Child;
import org.xutils.sample.db.Parent;
import org.xutils.view.annotation.ContentView;
import org.xutils.view.annotation.Event;
import org.xutils.view.annotation.ViewInject;
import org.xutils.x;

import java.io.File;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

/**
 * Created by wyouflf on 15/11/4.
 */
@ContentView(R.layout.fragment_db)
public class DbFragment extends BaseFragment {

    DbManager.DaoConfig daoConfig = new DbManager.DaoConfig()
            .setDbName("test.db")
            // 不设置dbDir时, 默认存储在app的私有目录.
            .setDbDir(new File("/sdcard")) // "sdcard"的写法并非最佳实践, 这里为了简单, 先这样写了.
            .setDbVersion(2)
            .setDbOpenListener(new DbManager.DbOpenListener() {
                @Override
                public void onDbOpened(DbManager db) {
                    // 开启WAL, 对写入加速提升巨大
                    db.getDatabase().enableWriteAheadLogging();
                }
            })
            .setDbUpgradeListener(new DbManager.DbUpgradeListener() {
                @Override
                public void onUpgrade(DbManager db, int oldVersion, int newVersion) {
                    // TODO: ...
                    // db.addColumn(...);
                    // db.dropTable(...);
                    // ...
                    // or
                    // db.dropDb();
                }
            });

    @ViewInject(R.id.tv_db_result)
    private TextView tv_db_result;

    @Event(R.id.btn_test_db)
    private void onTestDbClick(View view) {

        // 一对多: (本示例的代码)
        // 自己在多的一方(child)保存另一方的(parentId), 查找的时候用parentId查parent或child.
        // 一对一:
        // 在任何一边保存另一边的Id并加上唯一属性: @Column(name = "parentId", property = "UNIQUE")
        // 多对多:
        // 再建一个关联表, 保存两边的id. 查询分两步: 先查关联表得到id, 再查对应表的属性.

        String temp = "";

        try {

            DbManager db = x.getDb(daoConfig);

            Child child = new Child();
            child.setName("child‘s name");

            Parent test = db.selector(Parent.class).where("id", "in", new int[]{1, 3, 6}).findFirst();
            // long count = db.selector(Parent.class).where("id", "in", new int[]{1, 3, 6}).count();
            // Parent test = db.selector(Parent.class).where("id", "between", new String[]{"1", "5"}).findFirst();
            if (test != null) {
                child.setParentId(test.getId());
                temp += "first parent:" + test + "\n";
                tv_db_result.setText(temp);
            }

            Parent parent = new Parent();
            parent.name = "测试" + System.currentTimeMillis();
            parent.setAdmin(true);
            parent.setEmail("[email protected]");
            parent.setTime(new Date());
            parent.setDate(new java.sql.Date(new Date().getTime()));
            //db.save(parent);
            db.saveBindingId(parent);

            db.saveBindingId(child);//保存对象关联数据库生成的id

            List<Child> children = db.selector(Child.class).findAll();
            temp += "children size:" + children.size() + "\n";
            tv_db_result.setText(temp);
            if (children.size() > 0) {
                temp += "last children:" + children.get(children.size() - 1) + "\n";
                tv_db_result.setText(temp);
            }

            Calendar calendar = Calendar.getInstance();
            calendar.add(Calendar.DATE, -1);
            calendar.add(Calendar.HOUR, 3);

            List<Parent> list = db.selector(Parent.class)
                    .where("id", "<", 54)
                    .and("time", ">", calendar.getTime())
                    .orderBy("id")
                    .limit(10).findAll();
            temp += "find parent size:" + list.size() + "\n";
            tv_db_result.setText(temp);
            if (list.size() > 0) {
                temp += "last parent:" + list.get(list.size() - 1) + "\n";
                tv_db_result.setText(temp);
            }

            // test update
            parent.name = "hahaha123";
            parent.setEmail("[email protected]");
            db.update(parent);
            db.update(parent, "name", "email");
            db.update(Parent.class,
                    WhereBuilder.b("id", "=", 1).and("isAdmin", "=", true),
                    new KeyValue("name", "test_name"), new KeyValue("isAdmin", false));

            Parent entity = child.getParent(db);
            temp += "find by id:" + entity.toString() + "\n";
            tv_db_result.setText(temp);

            List<DbModel> dbModels = db.selector(Parent.class)
                    .groupBy("name")
                    .select("name", "count(name) as count").findAll();
            temp += "group by result:" + dbModels.get(0).getDataMap() + "\n";
            tv_db_result.setText(temp);

        } catch (Throwable e) {
            temp += "error :" + e.getMessage() + "\n";
            tv_db_result.setText(temp);
        }
    }

    @Event(R.id.btn_test_db2)
    private void onTestDb2Click(View view) {
        tv_db_result.setText("wait...");
        x.task().run(new Runnable() { // 异步执行
            @Override
            public void run() {

                DbManager db = x.getDb(daoConfig);
                String result = "";

                List<Parent> parentList = new ArrayList<Parent>();
                for (int i = 0; i < 1000; i++) {
                    Parent parent = new Parent();
                    parent.setAdmin(true);
                    parent.setDate(new java.sql.Date(1234));
                    parent.setTime(new Date());
                    parent.setEmail(i + "[email protected]");
                    parentList.add(parent);
                }

                long start = System.currentTimeMillis();
                for (Parent parent : parentList) {
                    try {
                        db.save(parent);
                    } catch (DbException ex) {
                        ex.printStackTrace();
                    }
                }
                result += "插入1000条数据:" + (System.currentTimeMillis() - start) + "ms\n";

                start = System.currentTimeMillis();
                try {
                    parentList = db.selector(Parent.class).orderBy("id", true).limit(1000).findAll();
                } catch (DbException ex) {
                    ex.printStackTrace();
                }
                result += "查找1000条数据:" + (System.currentTimeMillis() - start) + "ms\n";

                start = System.currentTimeMillis();
                try {
                    db.delete(parentList);
                } catch (DbException ex) {
                    ex.printStackTrace();
                }
                result += "删除1000条数据:" + (System.currentTimeMillis() - start) + "ms\n";

                // 批量插入
                parentList = new ArrayList<Parent>();
                for (int i = 0; i < 1000; i++) {
                    Parent parent = new Parent();
                    parent.setAdmin(true);
                    parent.setDate(new java.sql.Date(1234));
                    parent.setTime(new Date());
                    parent.setEmail(i + "[email protected]");
                    parentList.add(parent);
                }

                start = System.currentTimeMillis();
                try {
                    db.save(parentList);
                } catch (DbException ex) {
                    ex.printStackTrace();
                }
                result += "批量插入1000条数据:" + (System.currentTimeMillis() - start) + "ms\n";

                try {
                    parentList = db.selector(Parent.class).orderBy("id", true).limit(1000).findAll();
                    db.delete(parentList);
                } catch (DbException ex) {
                    ex.printStackTrace();
                }

                final String finalResult = result;
                x.task().post(new Runnable() { // UI同步执行
                    @Override
                    public void run() {
                        tv_db_result.setText(finalResult);
                    }
                });
            }
        });
    }

}

 

import org.xutils.DbManager;
import org.xutils.db.annotation.Column;
import org.xutils.db.annotation.Table;
import org.xutils.ex.DbException;

/**
 * Author: wyouflf
 * Date: 13-7-29
 * Time: 下午5:04
 */
@Table(name = "child")
public class Child {

    @Column(name = "id", isId = true)
    private int id;

    @Column(name = "name")
    private String name;

    @Column(name = "email")
    private String email;

    @Column(name = "parentId" /*, property = "UNIQUE"//如果是一对一加上唯一约束*/)
    private long parentId; // 外键表id

    // 这个属性被忽略，不存入数据库
    private String willIgnore;

    @Column(name = "text")
    private String text;

    public Parent getParent(DbManager db) throws DbException {
        return db.findById(Parent.class, parentId);
    }

    public long getParentId() {
        return parentId;
    }

    public void setParentId(long parentId) {
        this.parentId = parentId;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getWillIgnore() {
        return willIgnore;
    }

    public void setWillIgnore(String willIgnore) {
        this.willIgnore = willIgnore;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    @Override
    public String toString() {
        return "Child{" +
                "id=" + id +
                ", name=‘" + name + ‘\‘‘ +
                ", email=‘" + email + ‘\‘‘ +
                ", parentId=" + parentId +
                ", willIgnore=‘" + willIgnore + ‘\‘‘ +
                ", text=‘" + text + ‘\‘‘ +
                ‘}‘;
    }
}

import org.xutils.DbManager;
import org.xutils.db.annotation.Column;
import org.xutils.db.annotation.Table;
import org.xutils.ex.DbException;

import java.util.Date;
import java.util.List;

/**
 * Author: wyouflf
 * Date: 13-7-25
 * Time: 下午7:06
 */
@Table(name = "parent", onCreated = "CREATE UNIQUE INDEX index_name ON parent(name,email)")
public class Parent {

    @Column(name = "id", isId = true)
    private int id;

    @Column(name = "name")
    public String name;

    @Column(name = "email")
    private String email;

    @Column(name = "isAdmin")
    private boolean isAdmin;

    @Column(name = "time")
    private Date time;

    @Column(name = "date")
    private java.sql.Date date;

    public List<Child> getChildren(DbManager db) throws DbException {
        return db.selector(Child.class).where("parentId", "=", this.id).findAll();
    }

    // 一对一
    //public Child getChild(DbManager db) throws DbException {
    //    return db.selector(Child.class).where("parentId", "=", this.id).findFirst();
    //}

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public boolean isAdmin() {
        return isAdmin;
    }

    public void setAdmin(boolean admin) {
        isAdmin = admin;
    }

    public Date getTime() {
        return time;
    }

    public void setTime(Date time) {
        this.time = time;
    }

    public java.sql.Date getDate() {
        return date;
    }

    public void setDate(java.sql.Date date) {
        this.date = date;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Parent{" +
                "id=" + id +
                ", name=‘" + name + ‘\‘‘ +
                ", email=‘" + email + ‘\‘‘ +
                ", isAdmin=" + isAdmin +
                ", time=" + time +
                ", date=" + date +
                ‘}‘;
    }
}