微信WCDB数据库基础使用-增删改查（直接上代码，没有废话）

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qiantanlong/article/details/79456235

import android.content.Context;

import com.tencent.wcdb.database.SQLiteDatabase;
import com.tencent.wcdb.database.SQLiteOpenHelper;
import java.io.File;
import hisign.com.wcdbdemo.utils.LogUtil;

/**
 * 简单的Helper
 */
public class PersonDBHelper extends SQLiteOpenHelper {
    // 数据库 db 文件名称
    private static final String DEFAULT_NAME = "person.db";

    // 默认版本号
    private static final int DEFAULT_VERSION = 2;

    private Context mContext;

    /**
     * 通过父类构造方法创建 person 数据库
     */
    public PersonDBHelper(Context context) {
        super(context, DEFAULT_NAME, null, DEFAULT_VERSION, null);
        this.mContext = context;
    }
    public PersonDBHelper(Context context, byte[] password) {
        super(context,DEFAULT_NAME,password,null,DEFAULT_VERSION,null);
        this.mContext = context;
    }
    /**
     * 表创建
     */
    @Override
    public void onCreate(SQLiteDatabase db) {
        final String SQL_CREATE = "CREATE TABLE IF NOT EXISTS person (_id INTEGER PRIMARY KEY AUTOINCREMENT , name VARCHAR(20) , address TEXT)";
        db.execSQL(SQL_CREATE);
    }

    /**
     * 版本升级
     */
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO
        LogUtil.logI("数据库版本"+oldVersion);
        LogUtil.logI("数据库新版本"+newVersion);
    }

    /**
     * 删除数据库 db 文件
     */
    public boolean onDelete() {
        File file = mContext.getDatabasePath(DEFAULT_NAME);
        return SQLiteDatabase.deleteDatabase(file);
    }
}

import android.content.ContentValues;
import android.content.Context;

import com.tencent.wcdb.Cursor;
import com.tencent.wcdb.database.SQLiteDatabase;

import java.util.ArrayList;
import java.util.List;

import hisign.com.wcdbdemo.model.Person;
import hisign.com.wcdbdemo.utils.LogUtil;

public class PersonDBManager {
    private PersonDBHelper mDBHelper;
    private SQLiteDatabase mDB;

    public PersonDBManager(Context context) {
//        mDBHelper = new PersonDBHelper(context);//没有加密
        mDBHelper = new PersonDBHelper(context, "1234".getBytes());//加密
        mDB = mDBHelper.getWritableDatabase();
    }

    /**
     * 插入数据
     *
     * @param person
     */
    public boolean addPersonData(Person person) {
        try {
            // 开启事务
            mDB.beginTransaction();

            // 执行插入语句
            final String sql = "INSERT INTO person VALUES(NULL,?,?)";
            Object[] objects = new Object[]{person.getName(), person.getAddress()};
            mDB.execSQL(sql, objects);

            // 设置事务完成成功
            mDB.setTransactionSuccessful();
        }catch (Exception e){
            return false;
        }finally {
            // 关闭事务
            mDB.endTransaction();
        }
        return true;
    }

    /**
     * 批量插入数据
     *
     * @param list
     * @return
     */
    public boolean addPersonList(List<Person> list) {
        try {
            // 开启事务
            mDB.beginTransaction();

            // 执行插入语句
            for (Person person : list) {
                Object[] objects = new Object[]{person.getName(), person.getAddress()};
                final String sql = "INSERT INTO person VALUES(NULL,?,?)";
                mDB.execSQL(sql, objects);
            }

            // 设置事务完成成功
            mDB.setTransactionSuccessful();
        } catch (Exception e) {
            return false;
        } finally {
            // 关闭事务
            mDB.endTransaction();
        }
        return true;
    }

    /**
     * 删除特定姓名的人员数据
     * @param name
     * @return
     */
    public boolean delPersonByName(String name) {
        try {
            // 开启事务
            mDB.beginTransaction();
            mDB.delete("person","name=?",new String[]{name});
            // 设置事务完成成功
            mDB.setTransactionSuccessful();
        } catch (Exception e) {
            return false;
        } finally {
            // 关闭事务
            mDB.endTransaction();
        }
        return true;
    }

    /**
     * 通过姓名获取数据库数据
     * @param name
     * @return
     */
    public List<Person> getPersonByName(String name){
        ArrayList<Person> persons = new ArrayList<>();
        String sql = "select * from person where name=?";
        LogUtil.logI(sql);
        Cursor cursor = mDB.rawQuery(sql, new String[]{name});
        while (cursor.moveToNext()){
            Person person = new Person();
            person.setName(cursor.getString(cursor.getColumnIndex("name")));
            person.setAddress(cursor.getString(cursor.getColumnIndex("address")));
            persons.add(person);
        }
        return persons;
    }
    /**
     * 获取全部数据库数据
     */
    public List<Person> getPersonListData() {
        List<Person> listData = new ArrayList<>();
        Cursor c = getAllPersonInfo();
        while (c.moveToNext()) {
            Person person = new Person();
            person.setName(c.getString(c.getColumnIndex("name")));
            person.setAddress(c.getString(c.getColumnIndex("address")));
            listData.add(person);
        }
        c.close();
        return listData;
    }

    public boolean updatePersonByName(String name,String address){
        ContentValues values = new ContentValues();
        values.put("address", address);
        int zhuiTao = mDB.update("person", values, "name=?", new String[]{name});
        if (zhuiTao > 0) {
            return true;
        } else {
            return false;
        }
    }
    private Cursor getAllPersonInfo() {
        return mDB.rawQuery("SELECT * FROM person", null);
    }

    /**
     * 关闭数据库
     */
    public void closeDB() {
        mDB.close();
    }

    /**
     * 删除数据库文件
     */
    public Boolean deleteDatabase() {
        return mDBHelper.onDelete();
    }

    /**
     * 删除数据库中所有数据
     */
    public void deleteAllData() {
        mDB.execSQL("DELETE FROM person;");
    }

}

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

import hisign.com.wcdbdemo.R;
import hisign.com.wcdbdemo.db.PersonDBManager;
import hisign.com.wcdbdemo.model.Person;

public class PersonActivity extends AppCompatActivity implements View.OnClickListener {

    private LinearLayout llSelect;
    private LinearLayout llInsert;
    private EditText etName;
    private Button btnSelect;
    private Button btnSelectOk;
    private PersonDBManager personDBManager;
    private TextView tvSelectResult;
    private EditText etInsertName;
    private EditText etInsertAdress;
    private Button btnInsert;
    private Button btnInsertOk;
    private LinearLayout llDelete;
    private Button btnDeleteSelcet;
    private TextView tvDeleteAddress;
    private Button btnDeleteOk;
    private TextView tvDeleteName;
    private LinearLayout llUpdate;
    private EditText etUpdateName1;
    private Button btnUpdateSelcet;
    private TextView tvUpdateName;
    private EditText etUpdateAddress;
    private Button btnUpdateOk;
    private Button btnDelete;
    private Button btnUpdate;
    private EditText etDeleteName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_person);
        personDBManager =new PersonDBManager(PersonActivity.this);
        //查询数据
        llSelect = (LinearLayout) findViewById(R.id.ll_select);
        etName = (EditText) findViewById(R.id.et_name);
        tvSelectResult = (TextView) findViewById(R.id.tv_select_result);
        btnSelect = (Button) findViewById(R.id.btn_select);
        btnSelectOk = (Button) findViewById(R.id.btn_select_ok);
        btnSelect.setOnClickListener(this);
        btnSelectOk.setOnClickListener(this);
        //插入数据
        llInsert = (LinearLayout) findViewById(R.id.ll_insert);
        etInsertName = (EditText) findViewById(R.id.et_insert_name);
        etInsertAdress = (EditText) findViewById(R.id.et_insert_address);
        btnInsertOk = (Button) findViewById(R.id.btn_insert_ok);
        btnInsert = (Button) findViewById(R.id.btn_insert);
        btnInsert.setOnClickListener(this);
        btnInsertOk.setOnClickListener(this);
        //删除数据
        btnDelete = (Button) findViewById(R.id.btn_del);
        llDelete = (LinearLayout) findViewById(R.id.ll_delete);
        etDeleteName = (EditText) findViewById(R.id.et_delete_name);
        btnDeleteSelcet = (Button) findViewById(R.id.btn_delete_selcect);
        tvDeleteAddress = (TextView) findViewById(R.id.tv_delete_address);
        tvDeleteName = (TextView) findViewById(R.id.tv_delete_name);
        btnDeleteOk = (Button) findViewById(R.id.btn_delete_ok);
        btnDeleteSelcet.setOnClickListener(this);
        btnDeleteOk.setOnClickListener(this);
        btnDelete.setOnClickListener(this);

        //更新数据
        btnUpdate = (Button) findViewById(R.id.btn_update);
        llUpdate = (LinearLayout) findViewById(R.id.ll_update);
        etUpdateName1 = (EditText) findViewById(R.id.et_update_name1);
        btnUpdateSelcet = (Button) findViewById(R.id.btn_update_selcect);
        tvUpdateName = (TextView) findViewById(R.id.tv_update_name);
        etUpdateAddress = (EditText) findViewById(R.id.et_update_address);
        btnUpdateOk = (Button) findViewById(R.id.btn_update_ok);
        btnUpdate.setOnClickListener(this);
        btnUpdateSelcet.setOnClickListener(this);
        btnUpdateOk.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_insert:
                llInsert.setVisibility(View.VISIBLE);
                llSelect.setVisibility(View.GONE);
                llDelete.setVisibility(View.GONE);
                llUpdate.setVisibility(View.GONE);
                break;
            case R.id.btn_insert_ok:
                Person person = new Person();
                String address = etInsertAdress.getText().toString().trim();
                String name = etInsertName.getText().toString().trim();
                if (!TextUtils.isEmpty(address)&&!TextUtils.isEmpty(name)){
                    person.setAddress(address);
                    person.setName(name);
                    boolean b = personDBManager.addPersonData(person);
                    if (b){
                        Toast.makeText(PersonActivity.this,"插入数据成功！",Toast.LENGTH_LONG).show();
                    }else {
                        Toast.makeText(PersonActivity.this,"插入数据失败！",Toast.LENGTH_LONG).show();
                    }
                }else {
                    Toast.makeText(PersonActivity.this,"地址或姓名不能为空！",Toast.LENGTH_LONG).show();
                }


                break;
            case R.id.btn_select:
                llInsert.setVisibility(View.GONE);
                llDelete.setVisibility(View.GONE);
                llUpdate.setVisibility(View.GONE);
                llSelect.setVisibility(View.VISIBLE);
                break;
            case R.id.btn_select_ok:
                String strName = etName.getText().toString().trim();
                StringBuffer result=new StringBuffer();
                if (!TextUtils.isEmpty(strName)) {
                    List<Person> zhuiTaoModels = personDBManager.getPersonByName(strName);
                    if (zhuiTaoModels != null && zhuiTaoModels.size() != 0) {
                        for (int i=0;i<zhuiTaoModels.size();i++){
                            result.append(zhuiTaoModels.get(i).toString());
                        }
                        tvSelectResult.setText(result);
                    }else {
                        tvSelectResult.setText("无数据");
                    }
                }
                break;
            case R.id.btn_del:
                llInsert.setVisibility(View.GONE);
                llDelete.setVisibility(View.VISIBLE);
                llUpdate.setVisibility(View.GONE);
                llSelect.setVisibility(View.GONE);
                break;
            case R.id.btn_delete_selcect:
                String nameDel = etDeleteName.getText().toString().trim();

                if (!TextUtils.isEmpty(nameDel)){
                    List<Person> zhuiTaoModel1 = personDBManager.getPersonByName(nameDel);
                    if (zhuiTaoModel1.size()!=0){
                        tvDeleteAddress.setText("地址："+zhuiTaoModel1.get(0).getAddress());
                        tvDeleteName.setText("姓名："+zhuiTaoModel1.get(0).getName());
                    }else {
                        Toast.makeText(PersonActivity.this,"查询结果不存在！",Toast.LENGTH_LONG).show();
                    }
                }
                break;
            case R.id.btn_delete_ok:
                String sfzh_del_ok = tvDeleteAddress.getText().toString().trim();
                String[] str = tvDeleteName.getText().toString().trim().split("：");
                String name_del_ok=str[1];
                if (!TextUtils.isEmpty(sfzh_del_ok)&&!TextUtils.isEmpty(name_del_ok)){
                    boolean b = personDBManager.delPersonByName(name_del_ok);
                    if (b){
                        Toast.makeText(PersonActivity.this,"删除数据成功！",Toast.LENGTH_LONG).show();
                        tvDeleteAddress.setText("");
                        tvDeleteName.setText("");
                    }
                }
                break;
            case R.id.btn_update:
                llInsert.setVisibility(View.GONE);
                llDelete.setVisibility(View.GONE);
                llUpdate.setVisibility(View.VISIBLE);
                llSelect.setVisibility(View.GONE);
                break;
            case R.id.btn_update_selcect:
                String sfzh_update_select = etUpdateName1.getText().toString().trim();
                if (!TextUtils.isEmpty(sfzh_update_select)){
                    List<Person> zhuiTaoModel1= personDBManager.getPersonByName(sfzh_update_select);
                    if (zhuiTaoModel1.size()!=0){
                        tvUpdateName.setText("地址："+zhuiTaoModel1.get(0).getAddress());
                        etUpdateAddress.setText("姓名："+zhuiTaoModel1.get(0).getName());
                    }else {
                        Toast.makeText(PersonActivity.this,"查询结果不存在！",Toast.LENGTH_LONG).show();
                    }
                }
                break;
            case R.id.btn_update_ok:
                String name_update_ok = tvUpdateName.getText().toString().trim();
                String address_update_ok = etUpdateAddress.getText().toString().trim();
                if (!TextUtils.isEmpty(address_update_ok)&&!TextUtils.isEmpty(name_update_ok)){
                    boolean b = personDBManager.updatePersonByName(name_update_ok,address_update_ok);
                    if (b){
                        Toast.makeText(PersonActivity.this,"更新数据成功！",Toast.LENGTH_LONG).show();
                        tvUpdateName.setText("");
                        etUpdateAddress.setText("");
                    }
                }
                break;
            default:
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        personDBManager.closeDB();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_insert"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="插入数据"/>

        <Button
            android:id="@+id/btn_select"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="查询数据"/>

        <Button
            android:id="@+id/btn_del"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="删除数据"/>

        <Button
            android:id="@+id/btn_update"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="修改数据"/>
    </LinearLayout>
    <LinearLayout
        android:id="@+id/ll_insert"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <EditText
            android:id="@+id/et_insert_name"
            android:hint="输入姓名"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <EditText
            android:id="@+id/et_insert_address"
            android:hint="输入地址"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <Button
            android:text="确定"
            android:id="@+id/btn_insert_ok"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>
    <LinearLayout
        android:visibility="gone"
        android:id="@+id/ll_select"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <EditText
            android:id="@+id/et_name"
            android:hint="输入姓名"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <Button
            android:id="@+id/btn_select_ok"
            android:text="确定"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <TextView
            android:id="@+id/tv_select_result"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>
    <LinearLayout
        android:visibility="gone"
        android:id="@+id/ll_delete"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <EditText
            android:id="@+id/et_delete_name"
            android:hint="输入姓名"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <Button
            android:id="@+id/btn_delete_selcect"
            android:text="查询"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <TextView
            android:background="@color/black"
            android:layout_width="match_parent"
            android:layout_height="1dp"/>
        <TextView
            android:id="@+id/tv_delete_address"
            android:layout_width="match_parent"
            android:layout_height="50dp"/>
        <TextView
            android:id="@+id/tv_delete_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <Button
            android:id="@+id/btn_delete_ok"
            android:text="删除"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>
    <LinearLayout
        android:visibility="gone"
        android:id="@+id/ll_update"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <EditText
            android:id="@+id/et_update_name1"
            android:hint="输入姓名"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <Button
            android:id="@+id/btn_update_selcect"
            android:text="查询"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <TextView
            android:background="@color/black"
            android:layout_width="match_parent"
            android:layout_height="1dp"/>
        <TextView
            android:id="@+id/tv_update_name"
            android:layout_width="match_parent"
            android:layout_height="50dp"/>
        <EditText
            android:hint="修改地址"
            android:id="@+id/et_update_address"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <Button
            android:id="@+id/btn_update_ok"
            android:text="修改"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>

</LinearLayout>