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【Java】 Android SQLiteOpenHelper SQLite数据库增删改查操作

作者:Dezai.CN / 发布于2013/6/18/ 997


	import android.content.ContentValues;
	import android.content.Context;
	import android.database.Cursor;
	import android.database.sqlite.SQLiteDatabase;
	import android.database.sqlite.SQLiteOpenHelper;

	public class ToDoDB extends SQLiteOpenHelper {
	private final static String DATABASE_NAME = "todo_db";
	private final static int DATABASE_VERSION = 1;
	private final static String TABLE_NAME = "todo_table";
	public final static String FIELD_id = "_id";
	public final static String FIELD_TEXT = "todo_text";

	public ToDoDB(Context context) {
	 super(context, DATABASE_NAME, null, DATABASE_VERSION);
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
	 /* 建立table */
	 String sql = "CREATE TABLE " + TABLE_NAME + " (" + FIELD_id
	 + " INTEGER primary key autoincrement, " + " " + FIELD_TEXT
	 + " text)";
	 db.execSQL(sql);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
	 String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
	 db.execSQL(sql);
	 onCreate(db);
	}

	public Cursor select() {
	 SQLiteDatabase db = this.getReadableDatabase();
	 Cursor cursor = db
	 .query(TABLE_NAME, null, null, null, null, null, null);
	 return cursor;
	}

	public long insert(String text) {
	 SQLiteDatabase db = this.getWritableDatabase();
	 /* 将新增的值放入ContentValues */
	 ContentValues cv = new ContentValues();
	 cv.put(FIELD_TEXT, text);
	 long row = db.insert(TABLE_NAME, null, cv);
	 return row;
	}

	public void delete(int id) {
	 SQLiteDatabase db = this.getWritableDatabase();
	 String where = FIELD_id + " = ?";
	 String[] whereValue = { Integer.toString(id) };
	 db.delete(TABLE_NAME, where, whereValue);
	}

	public void update(int id, String text) {
	 SQLiteDatabase db = this.getWritableDatabase();
	 String where = FIELD_id + " = ?";
	 String[] whereValue = { Integer.toString(id) };
	 /* 将修改的值放入ContentValues */
	 ContentValues cv = new ContentValues();
	 cv.put(FIELD_TEXT, text);
	 db.update(TABLE_NAME, cv, where, whereValue);
	}
	}

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