Android数据库操作工具类

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;
}

}