使用到的類SQliteOpenHelper

第三個引數遊標工廠
SQliteOpenHelper helper=new SQliteOpenHelper(this,"sjx.db",null,1){
@Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table if not exists db _info("
                  + "id integer primary key,"
                  + "name varchar)"
 
);
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {    
    }
 }
 SQLiteDatebase db=helper.getReadableDatebase();

SQLiteDatebase物件 db
方法 db.rawQuery() 查詢
db.execSQL() 增刪改建立

1.插入
String sql= "insert into 1_tb (name,age,gender) value (?,?,?)"
 
;
db.execSQL(sql,new String[]{mName,mAge,mGender});
2.查詢
String sql="select * from 1_tb";
//這個 null的位置可以根據前面sql裡面的?自動填值
Cursor c = db.rawQuery(sql,null);
String sql2= "select * from 1_tb where _id = ?";
Cursor c = db.rawQuery(sql,nId);

引數1–上下文
引數2–佈局資源
引數3–遊標工廠
引數4–每個欄位
引數5–上面欄位存放的id
引數6–自動重新整理與否
SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,
R.layout.item,c,new String[]{“_id”,”name”},new int[]{R.id.name,R.id.age});

3.刪除
String sql="delete from 1_tb where _id = ?";
//注意此處是string 因為是被單引號括起來的
db.execSQL(sql,new String[]{mId})