Android数据库操作工具类分享

public class HistoryDAO {
  private DBConnection dbc = null;
  private SQLiteDatabase db = null;
  private Context context;

  //数据库上下文
  public HistoryDAO(Context context) {
    this.context = context;
  }
  //打开数据库
  public HistoryDAO open() {
    dbc = new DBConnection(context);
    db = dbc.getWritableDatabase();
    return this;
  }

  //关闭数据库
  public void closeAll() {
    db.close();
    dbc.close();
  }

//  // 增加
//  public void add(Search_HistoryData data, String type) {
//    open();
//    ContentValues values = new ContentValues();
//    values.put("content", data.getContent());
//    values.put("type", data.getType());
//    db.insert("history", null, values);
//    closeAll();
//  }

  // 增加
  public void add(Search_HistoryData data, String tableName) {
    open();
    ContentValues values = new ContentValues();
    values.put("content", data.getContent());
    db.insert(tableName, null, values);
    closeAll();
  }

  // 增加 工具类的最后五个专用
  public void addLawTool(Search_HistoryData data, String tableName) {
    open();
    ContentValues values = new ContentValues();
    values.put("content", data.getContent());
    values.put("_id", data.getId());
    db.insert(tableName, null, values);
    closeAll();
  }

  // 全查询
  public List getAll(String TableName) {
    open();
    List ar = new ArrayList();
    Cursor c = db.rawQuery("select * from " + TableName, null);
    while (c.moveToNext()) {
      Map map = new HashMap();
      map.put("_id", c.getInt(c.getColumnIndex("_id")));
      map.put("content", c.getString(c.getColumnIndex("content")));
      ar.add(map);
    }
    closeAll();
    return ar;
  }

  // 删除 根据id删除
  public void delete(String tableName, int uid) {
    open();
    db.delete("history", "uid=" + uid, null);
    closeAll();
  }

  //清空表中所有数据
  public void delete(String tableName) {
    open();
    db.delete(tableName, null, null);
    closeAll();
  }

  //判断是否存在
  public boolean searchResult(String tableName, String key) {
    open();
    Boolean booleans =
        db.rawQuery("select * from " + tableName + " where content = ?", new String[]{key}).moveToNext();
    closeAll();
    return booleans;
  }

  //根据库查询表字段
  public boolean searchResultToType(String content, String type) {
    open();
    Boolean booleans =
        db.rawQuery("select * from history where content = ? and type = ?", new String[]{content, type}).moveToNext();
    closeAll();
    return booleans;
  }

}