C#操作SQLite實現(xiàn)數(shù)據(jù)的增刪改查
更新時間：2022年01月23日 11:27:18 作者：熊思雨
SQLite是一個輕量級、跨平臺的關(guān)系型數(shù)據(jù)庫，在小型項目中，方便，易用，同時支持多種開發(fā)語言。本文將用C#語言對SQLite 的一個封裝，實現(xiàn)數(shù)據(jù)的增刪改查。需要的可以參考一下
簡介
SQLite是一個輕量級、跨平臺的關(guān)系型數(shù)據(jù)庫，在小型項目中，方便，易用，同時支持多種開發(fā)語言，下面是我用C#語言對SQLite 的一個封裝。
Winfrom界面如下：
代碼還需要改進部分：
下面的代碼我不覺得是完美的，讀者可以自己去實現(xiàn)這些功能：
1.如果不想用多線程可以去掉UsingLock.cs ，在SQLiteHelper.cs中刪除對應(yīng)的引用即可。
2.創(chuàng)建數(shù)據(jù)庫文件，可以從代碼中分離成單獨的方法。比如創(chuàng)建有密碼的數(shù)據(jù)庫文件。
3.在執(zhí)行SQL語句時，有些語句執(zhí)行成功，也不會有影響行數(shù)。比如，創(chuàng)建表，刪除表，此時執(zhí)行SQL語句返回的影響行數(shù)就為0。
4.只要SQL語句不報錯就是執(zhí)行成功的，在方法的返回值可以改為多個，比如用
Tuple<bool, string, int> 第一個參數(shù) bool 代表執(zhí)行結(jié)果，第二個參數(shù) string 代表錯誤信息，第三個參數(shù) int 代表影響的行數(shù)。
同樣，也可以這樣：
Tuple<bool, string, DataSet> 第一個參數(shù) bool 代表執(zhí)行結(jié)果，第二個參數(shù) string 代表錯誤信息，第三個參數(shù) DataSet 代表返回的表單數(shù)據(jù)。
主要代碼
SQLiteHelper.cs
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.SQLite;
using System.IO;
using System.Text;
namespace MySQLiteHelper
{
public class SQLiteHelper
{
#region 字段
/// <summary>
/// 事務(wù)的基類
/// </summary>
private DbTransaction DBtrans;
/// <summary>
/// 使用靜態(tài)變量字典解決多線程實例本類，實現(xiàn)一個數(shù)據(jù)庫對應(yīng)一個clslock
/// </summary>
private static readonly Dictionary<string, ClsLock> RWL = new Dictionary<string, ClsLock>();
/// <summary>
/// 數(shù)據(jù)庫地址
/// </summary>
private readonly string mdataFile;
/// <summary>
/// 數(shù)據(jù)庫密碼
/// </summary>
private readonly string mPassWord;
private readonly string LockName = null;
/// <summary>
/// 數(shù)據(jù)庫連接定義
/// </summary>
private SQLiteConnection mConn;
#endregion
#region 構(gòu)造函數(shù)
/// <summary>
/// 根據(jù)數(shù)據(jù)庫地址初始化
/// </summary>
/// <param name="dataFile">數(shù)據(jù)庫地址</param>
public SQLiteHelper(string dataFile)
{
this.mdataFile = dataFile ?? throw new ArgumentNullException("dataFile=null");
//this.mdataFile = AppDomain.CurrentDomain.BaseDirectory + dataFile;
this.mdataFile = dataFile;
if (!RWL.ContainsKey(dataFile))
{
LockName = dataFile;
RWL.Add(dataFile, new ClsLock());
}
}
/// <summary>
/// 使用密碼打開數(shù)據(jù)庫
/// </summary>
/// <param name="dataFile">數(shù)據(jù)庫地址</param>
/// <param name="PassWord">數(shù)據(jù)庫密碼</param>
public SQLiteHelper(string dataFile, string PassWord)
{
this.mdataFile = dataFile ?? throw new ArgumentNullException("dataFile is null");
this.mPassWord = PassWord ?? throw new ArgumentNullException("PassWord is null");
//this.mdataFile = AppDomain.CurrentDomain.BaseDirectory + dataFile;
this.mdataFile = dataFile;
if (!RWL.ContainsKey(dataFile))
{
LockName = dataFile;
RWL.Add(dataFile, new ClsLock());
}
}
#endregion
#region 打開/關(guān)閉 數(shù)據(jù)庫
/// <summary>
/// 打開 SQLiteManager 使用的數(shù)據(jù)庫連接
/// </summary>
public void Open()
{
if (string.IsNullOrWhiteSpace(mPassWord))
{
mConn = OpenConnection(this.mdataFile);
}
else
{
mConn = OpenConnection(this.mdataFile, mPassWord);
}
Console.WriteLine("打開數(shù)據(jù)庫成功");
}
/// <summary>
/// 關(guān)閉連接
/// </summary>
public void Close()
{
if (this.mConn != null)
{
try
{
this.mConn.Close();
if (RWL.ContainsKey(LockName))
{
RWL.Remove(LockName);
}
}
catch
{
Console.WriteLine("關(guān)閉失敗");
}
}
Console.WriteLine("關(guān)閉數(shù)據(jù)庫成功");
}
#endregion
#region 事務(wù)
/// <summary>
/// 開始事務(wù)
/// </summary>
public void BeginTrain()
{
EnsureConnection();
DBtrans = mConn.BeginTransaction();
}
/// <summary>
/// 提交事務(wù)
/// </summary>
public void DBCommit()
{
try
{
DBtrans.Commit();
}
catch (Exception)
{
DBtrans.Rollback();
}
}
#endregion
#region 工具
/// <summary>
/// 打開一個SQLite數(shù)據(jù)庫文件，如果文件不存在，則創(chuàng)建（無密碼）
/// </summary>
/// <param name="dataFile"></param>
/// <returns>SQLiteConnection 類</returns>
private SQLiteConnection OpenConnection(string dataFile)
{
if (dataFile == null)
{
throw new ArgumentNullException("dataFiledataFile=null");
}
if (!File.Exists(dataFile))
{
SQLiteConnection.CreateFile(dataFile);
}
SQLiteConnection conn = new SQLiteConnection();
SQLiteConnectionStringBuilder conStr = new SQLiteConnectionStringBuilder
{
DataSource = dataFile
};
conn.ConnectionString = conStr.ToString();
conn.Open();
return conn;
}
/// <summary>
/// 打開一個SQLite數(shù)據(jù)庫文件，如果文件不存在，則創(chuàng)建（有密碼）
/// </summary>
/// <param name="dataFile"></param>
/// <param name="Password"></param>
/// <returns>SQLiteConnection 類</returns>
private SQLiteConnection OpenConnection(string dataFile, string Password)
{
if (dataFile == null)
{
throw new ArgumentNullException("dataFile=null");
}
if (!File.Exists(Convert.ToString(dataFile)))
{
SQLiteConnection.CreateFile(dataFile);
}
try
{
SQLiteConnection conn = new SQLiteConnection();
SQLiteConnectionStringBuilder conStr = new SQLiteConnectionStringBuilder
{
DataSource = dataFile,
Password = Password
};
conn.ConnectionString = conStr.ToString();
conn.Open();
return conn;
}
catch (Exception)
{
return null;
}
}
/// <summary>
/// 讀取 或 設(shè)置 SQLiteManager 使用的數(shù)據(jù)庫連接
/// </summary>
public SQLiteConnection Connection
{
get
{
return mConn;
}
private set
{
mConn = value ?? throw new ArgumentNullException();
}
}
/// <summary>
/// 確保數(shù)據(jù)庫是連接狀態(tài)
/// </summary>
/// <exception cref="Exception"></exception>
protected void EnsureConnection()
{
if (this.mConn == null)
{
throw new Exception("SQLiteManager.Connection=null");
}
if (mConn.State != ConnectionState.Open)
{
mConn.Open();
}
}
/// <summary>
/// 獲取數(shù)據(jù)庫文件的路徑
/// </summary>
/// <returns></returns>
public string GetDataFile()
{
return this.mdataFile;
}
/// <summary>
/// 判斷表 table 是否存在
/// </summary>
/// <param name="table"></param>
/// <returns>存在返回true，否則返回false</returns>
public bool TableExists(string table)
{
if (table == null)
{
throw new ArgumentNullException("table=null");
}
EnsureConnection();
SQLiteDataReader reader = ExecuteReader("SELECT count(*) as c FROM sqlite_master WHERE type='table' AND name=@tableName ", new SQLiteParameter[] { new SQLiteParameter("tableName", table) });
if (reader == null)
{
return false;
}
reader.Read();
int c = reader.GetInt32(0);
reader.Close();
reader.Dispose();
//return false;
return c == 1;
}
/// <summary>
/// VACUUM 命令（通過復(fù)制主數(shù)據(jù)庫中的內(nèi)容到一個臨時數(shù)據(jù)庫文件，然后清空主數(shù)據(jù)庫，并從副本中重新載入原始的數(shù)據(jù)庫文件）
/// </summary>
/// <returns></returns>
public bool Vacuum()
{
try
{
using (SQLiteCommand Command = new SQLiteCommand("VACUUM", Connection))
{
Command.ExecuteNonQuery();
}
return true;
}
catch (System.Data.SQLite.SQLiteException)
{
return false;
}
}
#endregion
#region 執(zhí)行SQL
/// <summary>
/// 執(zhí)行SQL, 并返回 SQLiteDataReader 對象結(jié)果
/// </summary>
/// <param name="sql"></param>
/// <param name="paramArr">null 表示無參數(shù)</param>
/// <returns></returns>
public SQLiteDataReader ExecuteReader(string sql, SQLiteParameter[] paramArr)
{
if (sql == null)
{
throw new ArgumentNullException("sql=null");
}
EnsureConnection();
using (RWL[LockName].Read())
{
using (SQLiteCommand cmd = new SQLiteCommand(sql, Connection))
{
if (paramArr != null)
{
cmd.Parameters.AddRange(paramArr);
}
try
{
SQLiteDataReader reader = cmd.ExecuteReader();
cmd.Parameters.Clear();
return reader;
}
catch (Exception)
{
return null;
}
}
}
}
/// <summary>
/// 執(zhí)行查詢，并返回dataset對象
/// </summary>
/// <param name="sql">SQL查詢語句</param>
/// <param name="paramArr">參數(shù)數(shù)組</param>
/// <returns></returns>
public DataSet ExecuteDataSet(string sql, SQLiteParameter[] paramArr)
{
if (sql == null)
{
throw new ArgumentNullException("sql=null");
}
this.EnsureConnection();
using (RWL[LockName].Read())
{
using (SQLiteCommand cmd = new SQLiteCommand(sql, this.Connection))
{
if (paramArr != null)
{
cmd.Parameters.AddRange(paramArr);
}
try
{
SQLiteDataAdapter da = new SQLiteDataAdapter();
DataSet ds = new DataSet();
da.SelectCommand = cmd;
da.Fill(ds);
cmd.Parameters.Clear();
da.Dispose();
return ds;
}
catch (Exception)
{
return null;
}
}
}
}
/// <summary>
/// 執(zhí)行SQL查詢，并返回dataset對象。
/// </summary>
/// <param name="strTable">映射源表的名稱</param>
/// <param name="sql">SQL語句</param>
/// <param name="paramArr">SQL參數(shù)數(shù)組</param>
/// <returns></returns>
public DataSet ExecuteDataSet(string strTable, string sql, SQLiteParameter[] paramArr)
{
if (sql == null)
{
throw new ArgumentNullException("sql=null");
}
this.EnsureConnection();
using (RWL[LockName].Read())
{
using (SQLiteCommand cmd = new SQLiteCommand(sql, this.Connection))
{
if (paramArr != null)
{
cmd.Parameters.AddRange(paramArr);
}
try
{
SQLiteDataAdapter da = new SQLiteDataAdapter();
DataSet ds = new DataSet();
da.SelectCommand = cmd;
da.Fill(ds, strTable);
cmd.Parameters.Clear();
da.Dispose();
return ds;
}
catch (Exception)
{
return null;
}
}
}
}
/// <summary>
/// 執(zhí)行SQL，返回受影響的行數(shù)，可用于執(zhí)行表創(chuàng)建語句，paramArr == null 表示無參數(shù)
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public int ExecuteNonQuery(string sql, SQLiteParameter[] paramArr)
{
if (sql == null)
{
throw new ArgumentNullException("sql=null");
}
this.EnsureConnection();
using (RWL[LockName].Read())
{
try
{
using (SQLiteCommand cmd = new SQLiteCommand(sql, Connection))
{
if (paramArr != null)
{
foreach (SQLiteParameter p in paramArr)
{
cmd.Parameters.Add(p);
}
}
int c = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return c;
}
}
catch (SQLiteException)
{
return 0;
}
}
}
/// <summary>
/// 執(zhí)行SQL，返回結(jié)果集第一行，如果結(jié)果集為空，那么返回空 List(List.Count=0)，
/// rowWrapper = null 時，使用 WrapRowToDictionary
/// </summary>
/// <param name="sql"></param>
/// <param name="paramArr"></param>
/// <returns></returns>
public object ExecuteScalar(string sql, SQLiteParameter[] paramArr)
{
if (sql == null)
{
throw new ArgumentNullException("sql=null");
}
this.EnsureConnection();
using (RWL[LockName].Read())
{
using (SQLiteCommand cmd = new SQLiteCommand(sql, Connection))
{
if (paramArr != null)
{
cmd.Parameters.AddRange(paramArr);
}
try
{
object reader = cmd.ExecuteScalar();
cmd.Parameters.Clear();
cmd.Dispose();
return reader;
}
catch (Exception)
{
return null;
}
}
}
}
/// <summary>
/// 查詢一行記錄，無結(jié)果時返回 null，conditionCol = null 時將忽略條件，直接執(zhí)行 select * from table
/// </summary>
/// <param name="table">表名</param>
/// <param name="conditionCol"></param>
/// <param name="conditionVal"></param>
/// <returns></returns>
public object QueryOne(string table, string conditionCol, object conditionVal)
{
if (table == null)
{
throw new ArgumentNullException("table=null");
}
this.EnsureConnection();
string sql = "select * from " + table;
if (conditionCol != null)
{
sql += " where " + conditionCol + "=@" + conditionCol;
}
object result = ExecuteScalar(sql, new SQLiteParameter[] { new SQLiteParameter(conditionCol, conditionVal) });
return result;
}
#endregion
#region 增 刪 改
/// <summary>
/// 執(zhí)行 insert into 語句
/// </summary>
/// <param name="table"></param>
/// <param name="entity"></param>
/// <returns></returns>
public int InsertData(string table, Dictionary<string, object> entity)
{
if (table == null)
{
throw new ArgumentNullException("table=null");
}
this.EnsureConnection();
string sql = BuildInsert(table, entity);
return this.ExecuteNonQuery(sql, BuildParamArray(entity));
}
/// <summary>
/// 執(zhí)行 update 語句，注意：如果 where = null，那么 whereParams 也為 null，
/// </summary>
/// <param name="table">表名</param>
/// <param name="entity">要修改的列名和列名的值</param>
/// <param name="where">查找符合條件的列</param>
/// <param name="whereParams">where條件中參數(shù)的值</param>
/// <returns></returns>
public int Update(string table, Dictionary<string, object> entity, string where, SQLiteParameter[] whereParams)
{
if (table == null)
{
throw new ArgumentNullException("table=null");
}
this.EnsureConnection();
string sql = BuildUpdate(table, entity);
SQLiteParameter[] parameter = BuildParamArray(entity);
if (where != null)
{
sql += " where " + where;
if (whereParams != null)
{
SQLiteParameter[] newArr = new SQLiteParameter[(parameter.Length + whereParams.Length)];
Array.Copy(parameter, newArr, parameter.Length);
Array.Copy(whereParams, 0, newArr, parameter.Length, whereParams.Length);
parameter = newArr;
}
}
return this.ExecuteNonQuery(sql, parameter);
}
/// <summary>
/// 執(zhí)行 delete from table 語句，where不必包含'where'關(guān)鍵字，where = null 時將忽略 whereParams
/// </summary>
/// <param name="table"></param>
/// <param name="where"></param>
/// <param name="whereParams"></param>
/// <returns></returns>
public int Delete(string table, string where, SQLiteParameter[] whereParams)
{
if (table == null)
{
throw new ArgumentNullException("table=null");
}
this.EnsureConnection();
string sql = "delete from " + table + " ";
if (where != null)
{
sql += "where " + where;
}
return ExecuteNonQuery(sql, whereParams);
}
/// <summary>
/// 將 Dictionary 類型數(shù)據(jù) 轉(zhuǎn)換為 SQLiteParameter[] 類型
/// </summary>
/// <param name="entity"></param>
/// <returns></returns>
private SQLiteParameter[] BuildParamArray(Dictionary<string, object> entity)
{
List<SQLiteParameter> list = new List<SQLiteParameter>();
foreach (string key in entity.Keys)
{
list.Add(new SQLiteParameter(key, entity[key]));
}
if (list.Count == 0)
{
return null;
}
return list.ToArray();
}
/// <summary>
/// 將 Dictionary 類型數(shù)據(jù) 轉(zhuǎn)換為 插入數(shù)據(jù) 的 SQL語句
/// </summary>
/// <param name="table">表名</param>
/// <param name="entity">字典</param>
/// <returns></returns>
private string BuildInsert(string table, Dictionary<string, object> entity)
{
StringBuilder buf = new StringBuilder();
buf.Append("insert into ").Append(table);
buf.Append(" (");
foreach (string key in entity.Keys)
{
buf.Append(key).Append(",");
}
buf.Remove(buf.Length - 1, 1); // 移除最后一個,
buf.Append(") ");
buf.Append("values(");
foreach (string key in entity.Keys)
{
buf.Append("@").Append(key).Append(","); // 創(chuàng)建一個參數(shù)
}
buf.Remove(buf.Length - 1, 1);
buf.Append(") ");
return buf.ToString();
}
/// <summary>
/// 將 Dictionary 類型數(shù)據(jù) 轉(zhuǎn)換為 修改數(shù)據(jù) 的 SQL語句
/// </summary>
/// <param name="table">表名</param>
/// <param name="entity">字典</param>
/// <returns></returns>
private string BuildUpdate(string table, Dictionary<string, object> entity)
{
StringBuilder buf = new StringBuilder();
buf.Append("update ").Append(table).Append(" set ");
foreach (string key in entity.Keys)
{
buf.Append(key).Append("=").Append("@").Append(key).Append(",");
}
buf.Remove(buf.Length - 1, 1);
buf.Append(" ");
return buf.ToString();
}
#endregion
}
}UsingLock.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
namespace MySQLiteHelper
{
/// <summary>
/// 使用using代替lock操作的對象，可指定寫入和讀取鎖定模式
/// </summary>
public sealed class ClsLock
{
#region 內(nèi)部類
/// <summary>
/// 利用IDisposable的using語法糖方便的釋放鎖定操作內(nèi)部類
/// </summary>
private struct Lock : IDisposable
{
/// <summary>
/// 讀寫鎖對象
/// </summary>
private readonly ReaderWriterLockSlim _Lock;
/// <summary>
/// 是否為寫入模式
/// </summary>
private bool _IsWrite;
/// <summary>
/// 利用IDisposable的using語法糖方便的釋放鎖定操作構(gòu)造函數(shù)
/// </summary>
/// <param name="rwl">讀寫鎖</param>
/// <param name="isWrite">寫入模式為true，讀取模式為false</param>
public Lock(ReaderWriterLockSlim rwl, bool isWrite)
{
_Lock = rwl;
_IsWrite = isWrite;
}
/// <summary>
/// 釋放對象時退出指定鎖定模式
/// </summary>
public void Dispose()
{
if (_IsWrite)
{
if (_Lock.IsWriteLockHeld)
{
_Lock.ExitWriteLock();
}
}
else
{
if (_Lock.IsReadLockHeld)
{
_Lock.ExitReadLock();
}
}
}
}
/// <summary>
/// 空的可釋放對象，免去了調(diào)用時需要判斷是否為null的問題內(nèi)部類
/// </summary>
private class Disposable : IDisposable
{
/// <summary>
/// 空的可釋放對象
/// </summary>
public static readonly Disposable Empty = new Disposable();
/// <summary>
/// 空的釋放方法
/// </summary>
public void Dispose() { }
}
#endregion
/// <summary>
/// 讀寫鎖
/// </summary>
private readonly ReaderWriterLockSlim _LockSlim = new ReaderWriterLockSlim();
/// <summary>
/// 使用using代替lock操作的對象，可指定寫入和讀取鎖定模式構(gòu)造函數(shù)
/// </summary>
public ClsLock()
{
Enabled = true;
}
/// <summary>
/// 是否啟用，當該值為false時，Read()和Write()方法將返回 Disposable.Empty
/// </summary>
public bool Enabled { get; set; }
/// <summary>
/// 進入讀取鎖定模式，該模式下允許多個讀操作同時進行，
/// 退出讀鎖請將返回對象釋放，建議使用using語塊,
/// Enabled為false時，返回Disposable.Empty，
/// 在讀取或?qū)懭腈i定模式下重復(fù)執(zhí)行，返回Disposable.Empty;
/// </summary>
public IDisposable Read()
{
if (Enabled == false || _LockSlim.IsReadLockHeld || _LockSlim.IsWriteLockHeld)
{
return Disposable.Empty;
}
else
{
_LockSlim.EnterReadLock();
return new Lock(_LockSlim, false);
}
}
/// <summary>
/// 進入寫入鎖定模式,該模式下只允許同時執(zhí)行一個讀操作，
/// 退出讀鎖請將返回對象釋放，建議使用using語塊，
/// Enabled為false時，返回Disposable.Empty，
/// 在寫入鎖定模式下重復(fù)執(zhí)行，返回Disposable.Empty
/// </summary>
/// <exception cref="NotImplementedException">讀取模式下不能進入寫入鎖定狀態(tài)</exception>
public IDisposable Write()
{
if (Enabled == false || _LockSlim.IsWriteLockHeld)
{
return Disposable.Empty;
}
else if (_LockSlim.IsReadLockHeld)
{
throw new NotImplementedException("讀取模式下不能進入寫入鎖定狀態(tài)");
}
else
{
_LockSlim.EnterWriteLock();
return new Lock(_LockSlim, true);
}
}
}
}Form1.cs
using MySQLiteHelper;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.Windows.Forms;
namespace SQLiteDemo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private SQLiteHelper SQLiteHelpers = null;
private const string DBAddress = "D:\\SQLiteData\\test_record.db3";
private void Form1_Load(object sender, EventArgs e)
{
SQLiteHelpers = new SQLiteHelper(DBAddress,"123456");
}
/// <summary>
/// 打開數(shù)據(jù)庫
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_OpenDB_Click(object sender, EventArgs e)
{
SQLiteHelpers.Open();
Label_DBOpenState.Text = "打開";
}
/// <summary>
/// 關(guān)閉數(shù)據(jù)庫
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_CloseDB_Click(object sender, EventArgs e)
{
SQLiteHelpers.Close();
Label_DBOpenState.Text = "關(guān)閉";
}
/// <summary>
/// 查詢
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Query_Click(object sender, EventArgs e)
{
SQLiteParameter[] parameter = new SQLiteParameter[]
{
new SQLiteParameter("address", "濟南")
};
string sql = "SELECT * FROM student WHERE address = @address";
DataSet dataSet = SQLiteHelpers.ExecuteDataSet(sql, parameter);
if (dataSet != null)
{
dataGridView1.DataSource = dataSet.Tables[0];
}
}
/// <summary>
/// 插入數(shù)據(jù)
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Add_Click(object sender, EventArgs e)
{
Dictionary<string, object> dic = new Dictionary<string, object>();
dic.Add("ID", 6);
dic.Add("name", "王二麻子");
dic.Add("age", 44);
dic.Add("address", "陜西");
int result = SQLiteHelpers.InsertData("student", dic);
Console.WriteLine("插入結(jié)果，受影響的行數(shù)：" + result);
}
/// <summary>
/// 修改數(shù)據(jù)
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Modify_Click(object sender, EventArgs e)
{
Dictionary<string, object> dic = new Dictionary<string, object>();
//將列名 name 的值改為 “猴子”
dic.Add("name", "猴子");
//將列名 address 的值改為 花果山
dic.Add("address", "花果山");
//where條件
string where = "ID = @ID AND age = @Age";
//where條件中對應(yīng)的參數(shù)
SQLiteParameter[] parameter = new SQLiteParameter[]
{
new SQLiteParameter("ID", 4),
new SQLiteParameter("Age",23)
};
int result = SQLiteHelpers.Update("student", dic, where, parameter);
Console.WriteLine("修改結(jié)果，受影響的行數(shù)：" + result);
}
/// <summary>
/// 刪除數(shù)據(jù)
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Delete_Click(object sender, EventArgs e)
{
//where條件
string where = "ID = @ID";
//where條件中對應(yīng)的參數(shù)
SQLiteParameter[] parameter = new SQLiteParameter[]
{
new SQLiteParameter("ID", 6),
};
int result = SQLiteHelpers.Delete("student", where, parameter);
Console.WriteLine("刪除結(jié)果，受影響的行數(shù)：" + result);
}
/// <summary>
/// 判斷表是否存在
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_TableExists_Click(object sender, EventArgs e)
{
string title = "dddd";
bool result = SQLiteHelpers.TableExists(title);
Console.WriteLine(string.Format("{0} 表是否存在，結(jié)果：{1}", title, result));
}
//輸出各表中的數(shù)據(jù)
//public static void PrintValues(DataSet ds)
//{
// foreach (DataTable table in ds.Tables)
// {
// Console.WriteLine("表名稱：" + table.TableName);
// foreach (DataRow row in table.Rows)
// {
// foreach (DataColumn column in table.Columns)
// {
// Console.Write(row[column] + "");
// }
// Console.WriteLine();
// }
// }
//}
}
}以上就是C#操作SQLite實現(xiàn)數(shù)據(jù)的增刪改查的詳細內(nèi)容，更多關(guān)于C# SQLite增刪改查的資料請關(guān)注腳本之家其它相關(guān)文章！
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