Android数据库操作工具类分享

本文实例为大家分享了android数据库操作工具类的具体代码，供大家参考，具体内容如下

historydao

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;
  }

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。