SQLite在.net的应用

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

设置SQLiteCommand的Connection属性为SQLiteConnection

完整的窗体：

二、功能实现

1. 查询

（1）设置数据桥

           dataAdapter = new SQLiteDataAdapter(sqLiteCommand1);

cmdBuilder = new SQLiteCommandBuilder(dataAdapter);

table = new DataTable(tblName);

dataAdapter.Fill(table);

dataGridView1.DataSource = table;

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

（编辑：李大同）

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