Xamarin.Android 本地OA信用盘平台出租数据库 SQLiteDatabase 操作

目的：使用 SQLiteDatabase 创建OA信用盘平台出租QQ2952777280【话仙源码论坛】hxforum.com【木瓜源码论坛】papayabbs.com 本地数据库、表，并对数据进行增删改查操作。

引用命名空间：

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using Android.App;
using Android.Widget;
using Android.OS;
using Android.Database.Sqlite;
using Android.Content;
using System.IO;
using System.Data;
using Mono.Data.Sqlite;
using System;
using Android.Database;
using System.Collections.Generic;
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Person类

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public class Person
{
public string Id { get; set; }
public string Name { get; set; }
public string IdCard { get; set; }
public string Sex { get; set; }
public string Age { get; set; }
}
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创建局部变量Localhost_DataBase，以及控件，model类

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SQLiteDatabase Localhost_DataBase = null;

Person person;
List<Person> list = new List<Person>();
ListView lv_Person;
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创建数据库

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/// <summary>
/// 创建数据库
/// </summary>
void CreateDataBase()
{
try
{
//打开或创建数据库名称为:AssetsManage.db
Localhost_DataBase = OpenOrCreateDatabase("AssetsManage.db", FileCreationMode.Private, null);

    //判断是否存在数据库
    if (string.IsNullOrEmpty(GetSharedPreferences("AssetsManage", 0).GetString("AssetsManage", "")))//未创建数据库
    {
        File.Create(Localhost_DataBase.Path);
        //继续创建数据表
        CreateTable();
        //存取已创建数据库信息
        GetSharedPreferences("AssetsManage", 0).Edit().PutString("AssetsManage", "OK").Commit();
    }
}
catch
{
    //存取创建数据库时的异常
    GetSharedPreferences("Exception", 0).Edit().PutString("DataBaseException", "异常").Commit();
}

}
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创建表

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/// <summary>
/// 创建表
/// </summary>
void CreateTable()
{
string db = Localhost_DataBase.Path;
var conn = new SqliteConnection("Data Source=" + db);
//这里可以创建多张表
var commands = new[] {
"CREATE TABLE tb_person (Id int,name varchar(20),sex varchar(80),age varchar(20),idcard varchar(18))",

                "CREATE TABLE tb_grade (uId int,mathgrade varchar(5),Chinese varchar(5),English varchar(5))"
};
try
{
    foreach (var cmd in commands)
    {
        using (var sqlitecmd = conn.CreateCommand())
        {
            sqlitecmd.CommandText = cmd;
            sqlitecmd.CommandType = CommandType.Text;
            conn.Open();
            sqlitecmd.ExecuteNonQuery();
            conn.Close();
        }
    }

    InsertData();
}
catch (System.Exception e)
{
    //存取创建数据表时的异常
    GetSharedPreferences("Exception", 0).Edit().PutString("DataTableException", "异常").Commit();
}

}
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向表中插入模拟数据

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/// <summary>
/// 插入数据
/// </summary>
void InsertData()
{
for(int i=1;i<=10;i++)
{
ContentValues cv = new ContentValues();
cv.Put("Id", i.ToString());
cv.Put("name", "张三" + i.ToString());
cv.Put("sex", new Random().Next(1, 2) == 1 ? "男" : "女");
cv.Put("age", (20 + i).ToString());
cv.Put("idcard", "21072619971111111" + (i - 1).ToString());
Localhost_DataBase.Insert("tb_person", null, cv);

    ContentValues cv1 = new ContentValues();
    cv1.Put("uId", i);
    cv1.Put("mathgrade", new Random().Next(1, 100));
    cv1.Put("Chinese", new Random().Next(1, 100));
    cv1.Put("English", new Random().Next(1, 100));
    Localhost_DataBase.Insert("tb_grade", null, cv1);
}

}
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查询表中数据

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/// <summary>
/// 查询数据
/// </summary>
void QueryData()
{
ICursor ic = Localhost_DataBase.Query("tb_person", null, null, null, null, null, null); //全部查询
//ICursor ic = Localhost_DataBase.Query("tb_person", null, " id =? and name =?", new string[] { "1","张三1" }, null, null, null); //条件查询
for (int i = 0; i < ic.Count; i++)
{
if (i == 0) //确定游标位置
{
ic.MoveToFirst();
}
else
{
ic.MoveToNext();
}

    person = new Person(); 
    person.Id = ic.GetString(ic.GetColumnIndex("Id")); 
    person.Name = ic.GetString(ic.GetColumnIndex("name"));
    person.Age = ic.GetString(ic.GetColumnIndex("age"));
    person.Sex= ic.GetString(ic.GetColumnIndex("sex"));
    person.IdCard = ic.GetString(ic.GetColumnIndex("idcard")); 
    list.Add(person); 
}
lv_Person.Adapter = new ListViewAdapter(this, list);

}
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根据条件删除表中数据

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/// <summary>
/// 删除数据
/// </summary>
/// <param name="id"></param>
void DeleteData(string id)
{
Localhost_DataBase.Delete("tb_person", " Id=?", new string[] { id });
//Localhost_DataBase.Delete("tb_person", null, null); //删除表中所有数据
}
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根据条件修改表中数据

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/// <summary>
/// 修改数据
/// </summary>
/// <param name="name"></param>
void UpdateData(string id)
{
ContentValues cv = new ContentValues();
cv.Put("name", "张三1000");
Localhost_DataBase.Update("tb_person", cv, " Id=? ", new string[] { id });
}
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ListViewAdapter 类

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

namespace LocalhostDataBaseTest
{
public class ListViewAdapter:BaseAdapter<Person>
{
Activity context;
public List<Person> mings;

    public ListViewAdapter(Activity context, List<Person> mings)
    {
        this.context = context;
        this.mings = mings;
    }

    public override int Count
    {
        get
        {
            return this.mings.Count;
        }
    }

    public override long GetItemId(int position)
    {
        return position;
    }

    public override Person this[int position]
    {
        get
        {
            return this.mings[position];
        }
    }

    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        var itme = this.mings[position];

        convertView = LayoutInflater.From(context).Inflate(Resource.Layout.Person_Items, parent, false);

        TextView item_id = convertView.FindViewById<TextView>(Resource.Id.item_id);
        TextView item_name = convertView.FindViewById<TextView>(Resource.Id.item_name);
        TextView item_idcard = convertView.FindViewById<TextView>(Resource.Id.item_idcard);
        TextView item_sex = convertView.FindViewById<TextView>(Resource.Id.item_sex);
        TextView item_age = convertView.FindViewById<TextView>(Resource.Id.item_age);

        item_id.Text = (position + 1).ToString();
        item_name.SetText(itme.Name, TextView.BufferType.Normal);
        item_idcard.SetText(itme.IdCard, TextView.BufferType.Normal);
        item_sex.SetText(itme.Sex, TextView.BufferType.Normal);
        item_age.SetText(itme.Age, TextView.BufferType.Normal); 

        return convertView;
    }
}

}
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OnCreate调用

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protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);

// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);

lv_Person = FindViewById<ListView>(Resource.Id.listViewPerson);
CreateDataBase();
DeleteData("10");
UpdateData("9");
QueryData();

}

Xamarin.Android 本地OA信用盘平台出租数据库 SQLiteDatabase 操作

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