Sqlite 常用函数封装：修改密码，创建数据库、获取表段、字段，

以下是频繁用到的Sqlite函数，内容格式相对固定，封装一下有助于提高开发效率（^_^至少提高Codeeer的效率了）

而且，我发现Sqlite中文资料比较少，起码相对其他找起来要复杂些，服务一下大众~

我没有封装读取部分，因为数据库读取灵活性太大，封装起来难度也大，而且就算封装好了，也难以应付所有情况，还是建议根据实际情况设计代码逻辑。

解释下，为啥代码中的注释基本都用英文写了，因为这段时间在学双拼- -。可是还不太熟悉，打字超慢，而且Code的时候容易打断思路，好在~英文不多，而且这些都看不懂的话你……你要向我解释一下你是怎么一路学到数据库的 0。0

修改密码

/// <summary>
/// Change Password
/// </summary>
/// <param name="DataSource"></param>
/// <param name="OldPassword"></param>
/// <param name="NewPassword"></param>
/// <returns></returns>
public static bool PasswordChange(string DataSource,string OldPassword,string NewPassword)
{
    try
    {
        using (SQLiteConnection conn = new SQLiteConnection())
        {
            SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
            SCS.DataSource = DataSource;
            SCS.Password = OldPassword;
            conn.ConnectionString = SCS.ToString();

            conn.Open();

            //Change Password
            conn.ChangePassword(NewPassword);
        }
        return true;
    }
    catch (Exception E)
    {
        MessageBox.Show(E.Message,"提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
        return false;
    }
}

创建数据库

/// <summary>
/// Creat New Sqlite File
/// </summary>
/// <param name="NewTable">New Table Name</param>
/// <param name="NewWords">Words list of the New Table</param>
/// <param name="CreatNew">Creat or Add to the Database(Using to make Multi Tables)</param>
/// <returns></returns>
public static bool Creat(string DataSource,string NewTable,List<string> NewWords,string PassWord = null,bool CreatNew = true)
{
    try
    {
        if (CreatNew)
        {
            //Creat Data File
            SQLiteConnection.CreateFile(DataSource);
        }

        //Creat Table
        using (SQLiteConnection conn = new SQLiteConnection())
        {
            SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
            SCS.DataSource = DataSource;
            SCS.Password = PassWord;
            conn.ConnectionString = SCS.ToString();

            conn.Open();

            //Creat
            string Bazinga = "create table [" + NewTable + "] (";
            foreach (string Words in NewWords)
            {
                Bazinga += "[" + Words + "] TEXT COLLATE NOCASE,";
            }

            //Set Primary Key
            //The Top item from the "NewWords"
            Bazinga += @"PRIMARY KEY ([" + NewWords[0] + "]))";
            DbCommand cmd = conn.CreateCommand();
            cmd.Connection = conn;
            cmd.CommandText = Bazinga;
            cmd.ExecuteNonQuery();
        }
        return true;
    }
    catch (Exception E)
    {
        MessageBox.Show(E.Message,MessageBoxIcon.Information);
        return false;
    }
}

获取表段

/// <summary>
/// Get Tables From Sqlite
/// </summary>
/// <returns>list of Tables</returns>
public static List<string> GetTables(string DataSource,string PassWord = null)
{
    List<string> ResultLst = new List<string>();

    try
    {
        using (SQLiteConnection conn = new SQLiteConnection())
        {
            SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
            SCS.DataSource = DataSource;
            SCS.Password = PassWord;
            conn.ConnectionString = SCS.ToString();

            conn.Open();
            using (SQLiteCommand tablesGet = new SQLiteCommand("SELECT name from sqlite_master where type='table'",conn))
            {
                using (SQLiteDataReader tables = tablesGet.ExecuteReader())
                {
                    while (tables.Read())
                    {
                        try
                        {
                            ResultLst.Add(tables[0].ToString());
                        }
                        catch (Exception E)
                        {
                            MessageBox.Show(E.Message,MessageBoxIcon.Information);
                        }
                    }
                }
            }
        }
    }
    catch (Exception E)
    {
        MessageBox.Show(E.Message,MessageBoxIcon.Information);
    }

    return ResultLst;
}

获取字段

/// <summary>
/// Get Words From Table->Sqlite
/// </summary>
/// <param name="TargetTable">Target Table</param>
/// <returns>list of Words</returns>
public static List<string> GetWords(string DataSource,string TargetTable,string PassWord = null)
{
    List<string> WordsLst = new List<string>();

    using (SQLiteConnection conn = new SQLiteConnection())
    {
        SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
        SCS.DataSource = DataSource;
        SCS.Password = PassWord;
        conn.ConnectionString = SCS.ToString();

        conn.Open();
        using (SQLiteCommand tablesGet = new SQLiteCommand(@"SELECT * FROM " + TargetTable,conn))
        {
            using (SQLiteDataReader Words = tablesGet.ExecuteReader())
            {
                try
                {
                    for (int i = 0; i < Words.FieldCount; i++)
                    {
                        WordsLst.Add(Words.GetName(i));
                    }
                }
                catch (Exception E)
                {
                    MessageBox.Show(E.Message,MessageBoxIcon.Information);
                }
            }
        }
    }

    return WordsLst;
}

取值

/// <summary>
/// Get Values From Sqlite
/// </summary>
/// <returns>list of Values</returns>
public static List<string> GetValues(string DataSource,string Sql,string GetColumu,string PassWord = null)
{
    List<string> ResultLst = new List<string>();

    using (SQLiteConnection conn = new SQLiteConnection())
    {
        SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
        SCS.DataSource = DataSource;
        SCS.Password = PassWord;
        conn.ConnectionString = SCS.ToString();

        conn.Open();
        using (SQLiteCommand cmd = new SQLiteCommand(Sql,conn))
        {
            using (SQLiteDataReader dr = cmd.ExecuteReader())
            {
                while (dr.Read())
                {
                    try
                    {
                        ResultLst.Add(dr[GetColumu].ToString());
                    }
                    catch (Exception E)
                    {
                        MessageBox.Show(E.Message,MessageBoxIcon.Information);
                    }
                }
            }
        }
    }

    return ResultLst;
}

插入数据

/// <summary>
/// Insert Data
/// </summary>
/// <param name="DataSource"></param>
/// <param name="TargetTable"></param>
/// <returns></returns>
public static bool Insert(string DataSource,string ColumnS,string ValueS,string PassWord = null)
{
    try
    {
        using (SQLiteConnection conn = new SQLiteConnection())
        {
            SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
            SCS.DataSource = DataSource;
            SCS.Password = PassWord;
            conn.ConnectionString = SCS.ToString();

            conn.Open();

            //Insert
            DbCommand cmd = conn.CreateCommand();
            cmd.CommandText = "insert into [" + TargetTable + "] (" + ColumnS + ") values (" + ValueS + ")";
            cmd.ExecuteNonQuery();

            return true;
        }
    }
    catch (Exception E)
    {
        MessageBox.Show(E.Message,MessageBoxIcon.Information);
        return false;
    }
}

删除数据

/// <summary>
/// Delete Date
/// </summary>
/// <param name="DataSource"></param>
/// <param name="TargetTable"></param>
/// <param name="Word"></param>
/// <param name="Value"></param>
/// <returns></returns>
public static bool Delete(string DataSource,string Word,string Value,string PassWord = null)
{
    try
    {
        //Connect
        using (SQLiteConnection conn = new SQLiteConnection())
        {
            SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
            SCS.DataSource = DataSource;
            SCS.Password = PassWord;
            conn.ConnectionString = SCS.ToString();

            conn.Open();

            DbCommand cmd = conn.CreateCommand();
            cmd.Connection = conn;
            //Delete
            cmd.CommandText = "Delete From " + TargetTable + " where [" + Word + "] = '" + Value + "'";
            cmd.ExecuteNonQuery();
        }

        return true;
    }
    catch (Exception E)
    {
        MessageBox.Show(E.Message,MessageBoxIcon.Information);
        return false;
    }
}

执行Sqlite指令

/// <summary>
/// SQLiteCommand
/// </summary>
/// <param name="DataSource"></param>
/// <param name="Sql"></param>
/// <returns></returns>
public static bool SqlCommand(string DataSource,string PassWord = null)
{
    try
    {
        using (SQLiteConnection conn = new SQLiteConnection())
        {
            SQLiteConnectionStringBuilder SCS = new SQLiteConnectionStringBuilder();
            SCS.DataSource = DataSource;
            SCS.Password = PassWord;
            conn.ConnectionString = SCS.ToString();

            conn.Open();
            using (SQLiteCommand cmd_Re = new SQLiteCommand(Sql,conn))
            {
                cmd_Re.ExecuteNonQuery();
            }
        }
        return true;
    }
    catch (Exception E)
    {
        MessageBox.Show(E.Message,MessageBoxIcon.Information);
        return false;
    }
}

（编辑：李大同）

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