Android Sqlite数据库创建及操作，androidsqlite

Android Sqlite数据库创建及操作，androidsqlite

1.首先需要一个类集成SQLiteOpenHelper

public class RecordSQLiteOpenHelper extends SQLiteOpenHelper {

    //数据库名称
    private static String name = "temp.db";
    //数据库版本号
    private static Integer version = 1;

    public RecordSQLiteOpenHelper(Context context) {
        super(context, name, null, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        //执行数据库创建表的语句
        db.execSQL("create table records(id integer primary key autoincrement,name varchar(200))");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

2.在activity中声明变量

private RecordSQLiteOpenHelper helper = new     RecordSQLiteOpenHelper(this);;
private SQLiteDatabase db;

3.插入数据

/**
     * 插入数据
     */
    private void insertData(String tempName) {
        db = helper.getWritableDatabase();
        db.execSQL("insert into records(name) values('" + tempName + "')");
        db.close();
    }

4.模糊查询数据

/**
     * 模糊查询数据
     */
    private void queryData(String tempName) {
        Cursor cursor = helper.getReadableDatabase().rawQuery(
                "select id as _id,name from records where name like '%" + tempName + "%' order by id desc ", null);
        // 创建adapter适配器对象
        adapter = new SimpleCursorAdapter(this, android.R.layout.simple_list_item_1, cursor, new String[] { "name" },
                new int[] { android.R.id.text1 }, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        // 设置适配器
        listView.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }

5.查询数据库中是否有该条数据

/**
     * 检查数据库中是否已经有该条记录
     */
    private boolean hasData(String tempName) {
        Cursor cursor = helper.getReadableDatabase().rawQuery(
                "select id as _id,name from records where name =?", new String[]{tempName});
        //判断是否有下一个
        return cursor.moveToNext();
    }

6.清空数据

/**
     * 清空数据
     */
    private void deleteData() {
        db = helper.getWritableDatabase();
        db.execSQL("delete from records");
        db.close();
    }