Android笔记之调用

1、DbOpenHelper.java

package com.utils;

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

public class DbOpenHelper extends SQLiteOpenHelper {

    private static String dbName = CommonUrl.Db_Name;// 数据库名称
    private static int version = CommonUrl.Db_Version;// 数据库版本号

    public DbOpenHelper(Context context) {
        super(context, dbName, null, version);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        // 在数据库中创建表Course
        String sql1 = "create table Course(id integer primary key autoincrement,week text not null,courseindex text not null,coursename text not null,coursetime int not null,room text not null ,teacher text not null,doubleonly int default 0,term int default 0)";

        db.execSQL(sql1);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

    }
}

查找

package dao;

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import service.StudentInfoService;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteConstraintException;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.utils.CommonUrl;
import com.utils.DbOpenHelper;
import com.utils.GsonUlits;
import com.utils.HttpClientUtils;

public class StudentInfoDao implements StudentInfoService {

    private DbOpenHelper helper = null;

    public StudentInfoDao(Context context) {
        super();
        helper = new DbOpenHelper(context);
    }

    @Override
    public boolean fillStudentInfo(Object[] infolist) {
        // TODO Auto-generated method stub
        boolean flag = false;
        // 实现对数据库的添加，删除和修改功能
        SQLiteDatabase database = null;
        try {
            String sql = "insert into StuInfo(stuid ,name ,sex ,birthday ,xueyuan ,zhuanye, banhao,tel ,qq) values (?,?,?,?,?,?,?,?,?)";
            database = helper.getWritableDatabase();
            database.execSQL(sql, infolist);
            flag = true;
        } catch (SQLiteConstraintException e) {
            // column stuid is not unique (code 19)
            e.printStackTrace();
        }
        if (!flag) {
            String sql = "update StuInfo set name=? ,sex=? ,birthday=? ,xueyuan=? ,zhuanye=?, banhao=? ,tel=?,qq=? where stuid=?";
            database = helper.getWritableDatabase();
            String stuid = (String) infolist[0];
            for (int i = 0; i < 8; i++) {
                infolist[i] = infolist[i + 1];
            }
            infolist[8] = stuid;
            database.execSQL(sql, infolist);
            flag = true;
        }
        return flag;
    }

    @Override
    public Map<String, String> getSimpleInfo(String selection,
            String[] selectionArgs) {
        // TODO Auto-generated method stub

        Map<String, String> map = new HashMap<String, String>();
        SQLiteDatabase database = null;
        Cursor cursor = null;// query返回的对象是Cursor
        try {
            database = helper.getWritableDatabase();
            // String[] co = { "coursename", "room", "teacher", "week" };
            // 在2.X版本下query方法汇出错误：
            // java.lang.NoSuchMethodError:
            // android.database.sqlite.SQLiteDatabase.query
            cursor = database.query(true, "StuInfo", null, selection,
                    selectionArgs, null, null, null, null, null);
            int cols_num = cursor.getColumnCount();
            while (cursor.moveToNext()) {
                for (int i = 0; i < cols_num; i++) {
                    String cols_name = cursor.getColumnName(i);
                    String cols_value = cursor.getString(cursor
                            .getColumnIndex(cols_name));
                    if (cols_value == null) {
                        cols_value = "";
                    }
                    Log.i(i + "", "cols_name=" + cols_name + ",cols_value="
                            + cols_value);
                    map.put(cols_name, cols_value);
                }
            }

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            if (database != null) {
                database.close();
            }
        }
        return map;
    }

    @Override
    public boolean poststudent(Map<String, String> map) {
        // TODO Auto-generated method stub
        Map<String, String> info = new HashMap<String, String>();
        info.put("student.stuid", map.get("stuid"));
        info.put("student.name", map.get("name"));
        info.put("student.sex", map.get("sex"));
        info.put("student.xueyuan", map.get("xueyuan"));
        info.put("student.zhuanye", map.get("zhuanye"));
        info.put("student.banhao", map.get("banhao"));
        info.put("student.birthday", map.get("birthday"));
        String result = HttpClientUtils.sendHttpclientPost(
                CommonUrl.Add_Student, info, "utf8");
        if (result.contains("成功"))
            return true;
        return false;
    }

    @Override
    public List<Map<String, Object>> getstudentlist(String banhao) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("tmp", "");
        // TODO Auto-generated method stub
        String jsonString = HttpClientUtils.sendHttpclientPost(
                CommonUrl.Student_List, map, CommonUrl.encode);
        if (jsonString.equals(""))
            return null;
        List<Map<String, Object>> list = GsonUlits
                .getListKeyapFromGson(jsonString);
        return list;
    }

    @Override
    public List<Map<String, String>> getMoreInfo(String selection,
            String[] selectionArgs) {
        // TODO Auto-generated method stub
        List<Map<String, String>> list = new ArrayList<Map<String, String>>();
        SQLiteDatabase database = null;
        Cursor cursor = null;// query返回的对象是Cursor
        try {
            database = helper.getWritableDatabase();

            cursor = database.query(true, "StuInfo", null, selection,
                    selectionArgs, null, null, null, null, null);
            int cols_num = cursor.getColumnCount();
            while (cursor.moveToNext()) {
                Map<String, String> map = new HashMap<String, String>();
                for (int i = 0; i < cols_num; i++) {
                    String cols_name = cursor.getColumnName(i);
                    String cols_value = cursor.getString(cursor
                            .getColumnIndex(cols_name));
                    if (cols_value == null) {
                        cols_value = "";
                    }
                    Log.i(i + "", "cols_name=" + cols_name + ",cols_value="
                            + cols_value);

                    map.put(cols_name, cols_value);
                }
                list.add(map);
            }

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            if (database != null) {
                database.close();
            }
        }
        return list;
    }

    @Override
    public boolean addMessage(String body, String stuid, String type) {
        // TODO Auto-generated method stub

        boolean flag = false;
        // 实现对数据库的添加，删除和修改功能
        SQLiteDatabase database = null;
        Timestamp ts = new Timestamp(System.currentTimeMillis());
        Object[] infolist = { stuid, body, ts, type };
        try {
            String sql = "insert into Message(stuid ,body ,timestamp,type) values (?,?,?,?)";
            database = helper.getWritableDatabase();

            database.execSQL(sql, infolist);
            flag = true;
        } catch (SQLiteConstraintException e) {
            // column stuid is not unique (code 19)
            e.printStackTrace();
        }
        return flag;
    }

    @Override
    public List<Map<String, String>> getMessageList(String stuid) {
        // TODO Auto-generated method stub
        List<Map<String, String>> list = new ArrayList<Map<String, String>>();
        SQLiteDatabase database = null;
        Cursor cursor = null;// query返回的对象是Cursor
        try {
            database = helper.getWritableDatabase();

            String selection = "stuid=?";
            String[] selectionArgs = { stuid };
            cursor = database.query(true, "Message", null, selection,
                    selectionArgs, null, null, "timestamp", null, null);
            int cols_num = cursor.getColumnCount();
            while (cursor.moveToNext()) {
                Map<String, String> map = new HashMap<String, String>();
                for (int i = 0; i < cols_num; i++) {
                    String cols_name = cursor.getColumnName(i);
                    String cols_value = cursor.getString(cursor
                            .getColumnIndex(cols_name));
                    if (cols_value == null) {
                        cols_value = "";
                    }

                    map.put(cols_name, cols_value);
                }
                list.add(map);
            }

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            if (database != null) {
                database.close();
            }
        }
        return list;
    }
}

Done!