SQLite在.net的应用

时间:2014-05-11 14:37:17   收藏:0   阅读:527

       IDE: VS2005

       语言: C#

       组件: sqlite-netFx20-setup-bundle-x86-2005-1.0.92.0


       简介:

                本示例使用SQLite的密码、外键功能。以及关闭临时文件(journal mode=Off)。

                通过查询和插入(修改、删除)来演示C#使用SQLite的实用性。


一、设计窗体

        拖拽2个TextBox、2个Button、1个DataGridView、1个SQLiteConnection、1个SQLiteCommand

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        设置SQLiteCommand的Connection属性为SQLiteConnection

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        完整的窗体:

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二、功能实现

        1. 查询

           (1)设置数据桥

           dataAdapter = new SQLiteDataAdapter(sqLiteCommand1);

           (2)设置缓存器

cmdBuilder = new SQLiteCommandBuilder(dataAdapter);

            (3)建立数据表

table = new DataTable(tblName);

             (4)连接数据表

dataAdapter.Fill(table);

              (5)指定数据源

dataGridView1.DataSource = table;

               为了定位表的名称,我们使用查找特定的关键字:from。

int iPos = statementStr.LastIndexOf("from") + 5;

            String tblName = statementStr.Substring(iPos, (statementStr.Length - 1) - iPos);


    2. 插入

        按照行来分解Insert语句;也可以执行Update、Delete等语句。

            int i = edtStmt.Lines.Length;
            for (int j = 0; j < i; j++)
            {
                String strSta = edtStmt.Lines[j].ToString();
                sqLiteCommand1.CommandText = strSta;
                sqLiteCommand1.ExecuteNonQuery();
            }


三、源代码

        Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Data.SQLite;

namespace testSQLite
{
    public partial class Form1 : Form
    {
        private DataTable table;
        private SQLiteDataAdapter dataAdapter;
        private SQLiteCommandBuilder cmdBuilder;
        private String strFmt, connStr;
        private String currDir;

        public Form1()
        {
            InitializeComponent();

            currDir = Directory.GetCurrentDirectory();
            strFmt = "data source=\"" + currDir + "/{0}\""
                    + ";page size=32768;"
                    + "cache size=0;"
                    + "Password=20130321;"
                    + "foreign keys=True;"
                    + "journal mode=Off";
        }

        private void btnExec_Click(object sender, EventArgs e)
        {
            if (edtStmt.Text.ToLower().IndexOf("insert") < 0) return;

            connStr = string.Format(strFmt, edtDB.Text);
            //
            sqLiteConnection1.Close();
            sqLiteConnection1.ConnectionString = connStr;
            sqLiteConnection1.Open();

            int i = edtStmt.Lines.Length;
            for (int j = 0; j < i; j++)
            {
                String strSta = edtStmt.Lines[j].ToString();
                sqLiteCommand1.CommandText = strSta;
                sqLiteCommand1.ExecuteNonQuery();
            }
            MessageBox.Show("Insert Done");
        }

        private void btnSearch_Click(object sender, EventArgs e)
        {
            if (edtStmt.Text.IndexOf(";") < 0)
            {
                MessageBox.Show("Please enter a SQL statement terminator - ‘;‘");
                return;
            }
            connStr = string.Format(strFmt, edtDB.Text);


            String statementStr = edtStmt.Text.ToLower();

            int iPos = statementStr.LastIndexOf("from") + 5;

            String tblName = statementStr.Substring(iPos, (statementStr.Length - 1) - iPos);

            sqLiteConnection1.Close();
            sqLiteConnection1.ConnectionString = connStr;
            sqLiteConnection1.Open();

            sqLiteCommand1.CommandText = edtStmt.Text;
            dataAdapter = new SQLiteDataAdapter(sqLiteCommand1);
            cmdBuilder = new SQLiteCommandBuilder(dataAdapter);

            table = new DataTable(tblName);
            dataAdapter.Fill(table);

            dataGridView1.DataSource = table;
        }
    }
}



参考文档:

       SQLite.NET.chm



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