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  • android 入门 006(sqlite增删改查)

    android 入门 006(sqlite增删改查)

    package cn.rfvip.feb_14_2_sqlite;
    
    import android.content.Context;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteDatabase.CursorFactory;
    import android.database.sqlite.SQLiteOpenHelper;
    
    public class MyOpenHelper extends SQLiteOpenHelper {
    
        public MyOpenHelper(Context context, String name, CursorFactory factory,
                int version) {
            super(context, name, factory, version);
            // TODO 自动生成的构造函数存根
            
            
        }
    
        @Override
        public void onCreate(SQLiteDatabase db) 
        {
            // TODO 自动生成的方法存根
            System.out.println("创建数据库");
            db.execSQL("CREATE TABLE people (_id integer PRIMARY KEY AUTOINCREMENT,name char(10),salary char(20),phone integer(20)) ");
        }
    
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO 自动生成的方法存根
            System.out.println("更新数据库");
        }
    
    }
    package cn.rfvip.feb_14_2_sqlite.UnitTest;
    
    import cn.rfvip.feb_14_2_sqlite.MyOpenHelper;
    import android.content.res.ObbInfo;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.test.AndroidTestCase;
    
    public class UnitTest extends AndroidTestCase 
    {
     private MyOpenHelper myOpenHelper;
    private SQLiteDatabase db;
    
    //测试之前调用
    @Override
    protected void setUp() throws Exception {
        // TODO 自动生成的方法存根
        super.setUp();
        myOpenHelper=new MyOpenHelper(getContext(), "people.db", null, 2);
        db = myOpenHelper.getWritableDatabase();
    }
    
    //测试之后调用
        @Override
        protected void tearDown() throws Exception 
        {
            // TODO 自动生成的方法存根
            super.tearDown();
            db.close();
        }
    
        public  void Test() 
        {
            myOpenHelper=new MyOpenHelper(getContext(), "people.db", null, 2);
            SQLiteDatabase db=myOpenHelper.getWritableDatabase();
        }
    
        public void Insert()
        {
            db.execSQL("insert into people(name,salary,phone)values(?,?,?)",new Object[]{"李纯访1","15000",180178});
            db.execSQL("insert into people(name,salary,phone)values(?,?,?)",new Object[]{"李纯访2","15000",180178});
            db.execSQL("insert into people(name,salary,phone)values(?,?,?)",new Object[]{"李纯访3","15000",180178});
            db.execSQL("insert into people(name,salary,phone)values(?,?,?)",new Object[]{"李纯访4","15000",180178});
            db.execSQL("insert into people(name,salary,phone)values(?,?,?)",new Object[]{"李纯访5","15000",180178});
        }
        
        public void Delete()
        {
            db.execSQL("delete from people where name= ?",new Object[]{"李纯访"});
        }
        public void Update()
        {
            db.execSQL("update people set phone=? where name= ?",new Object[]{153333,"李纯访"});
        }
        public void Select()
        {
             Cursor cursor=db.rawQuery("select name,salary from people", null);
             while (cursor.moveToNext())
             {
                String name=cursor.getString(cursor.getColumnIndex("name"));
                String salary=cursor.getString(cursor.getColumnIndex("salary"));
                System.out.println(name + ";" + salary);
                
            }
        }
    }

    google 封装的增删改查

    // google 封装的方法
        public void InsertApi() {
            ContentValues values = new ContentValues();
            values.put("name", "李度");
            values.put("salary", "20000");
            values.put("phone", "15000");
            Long numberrow = db.insert("people", null, values);
            System.out.println("插入的当前行数:" + numberrow);
        }
    
        public void DeleteApi() {
            int numberrow = db.delete("people", "name=? and _id= ?", new String[] {
                    "李纯访1", "2" });
            System.out.println("删除的行数:" + numberrow);
        }
    
        public void UpdateApi()
        {
             ContentValues values=new ContentValues();
             values.put("name", "lidu");
             int numberrow= db.update("people", values, "name= ? and _id= ?",new String[]{"李纯访2", "3" } );
             System.out.println("更新的行数:"+numberrow);
        }
        //columns 为null查询所有 new String[]{"name","salary"}
        public void SelectApi() 
        {
            Cursor cursor=db.query("people", null,  null, null, null, null, null);
            while (cursor.moveToNext()) 
            {
            String name=cursor.getString(cursor.getColumnIndex("name"));    
            String salary=cursor.getString(cursor.getColumnIndex("salary"));
            String phone=cursor.getString(cursor.getColumnIndex("phone"));
            System.out.println("姓名为:" + name +";工资为:" + salary +";电话为:" + phone );
            }
        }
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  • 原文地址:https://www.cnblogs.com/laopo/p/5189844.html
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