Sqlite 常用函數封裝提高Codeeer的效率

以下是頻繁用到的Sqlite函數，內容格式相對固定，封裝一下有助於提高開發效率（^_^至少提高Codeeer的效率了）

而且，我發現Sqlite中文資料比較少，起碼相對其他找起來要複雜些，服務一下福士~
我沒有封裝讀取部分，因為資料庫讀取靈活性太大，封裝起來難度也大，而且就算封裝好了，也難以應付所有情況，還是建議根據實際情況設計代碼邏輯。

建立： 複製代碼 代碼如下:/// <summary>
/// Creat New Sqlite File
/// </summary>
/// <param name="NewTable">New Table Name</param>
/// <param name="NewWords">Words list of the New Table</param>
/// <returns>IsSuccessful</returns>
public static bool Creat(string DataSource, string NewTable, List<string> NewWords)
{
try
{
//Creat Data File
SQLiteConnection.CreateFile(DataSource);
//Creat Table
using (DbConnection conn = SQLiteFactory.Instance.CreateConnection())
{
//Connect
conn.ConnectionString = "Data Source=" + DataSource;
conn.Open();
//Creat
string Bazinga = "create table [" + NewTable + "] (";
foreach (string Words in NewWords)
{
Bazinga += "[" + Words + "] BLOB 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, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return false;
}
}

刪除： 複製代碼 代碼如下:/// <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 TargetTable, string Word, string Value)
{
try
{
//Connect
using (DbConnection conn = SQLiteFactory.Instance.CreateConnection())
{
conn.ConnectionString = "Data Source=" + DataSource;
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, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return false;
}
}

插入：
這裡要說明下，因為存在多欄位同時插入的情況（何止存在，很普遍- -。沒見過誰的資料庫像意大利麵條一樣）

在這裡設計了Insert結構用以儲存欄位和值的關係（曾考慮過用數組的辦法實現，可是那玩意不太方便調用，瞅著挺抽象的，不太好用，如果有更好的建議，歡迎留言~） 複製代碼 代碼如下:/// <summary>
/// Use to format Insert column's value
/// </summary>
public struct InsertBag
{
public string ColumnName;
public string Value;
public InsertBag(string Column, string value)
{
ColumnName = Column;
Value = value;
}
}

以下為插入模組的主函數： 複製代碼 代碼如下:/// <summary>
/// Insert Data
/// </summary>
/// <param name="DataSource"></param>
/// <param name="TargetTable"></param>
/// <param name="InsertBags">struck of InsertBag</param>
/// <returns></returns>
public static bool Insert(string DataSource, string TargetTable, List<InsertBag> InsertBags)
{
try
{
using (DbConnection conn = SQLiteFactory.Instance.CreateConnection())
{
//Connect Database
conn.ConnectionString = "Data Source=" + DataSource;
conn.Open();
//Deal InsertBags
StringBuilder ColumnS = new StringBuilder();
StringBuilder ValueS = new StringBuilder();
for (int i = 0; i < InsertBags.Count; i++)
{
ColumnS.Append(InsertBags[i].ColumnName + ",");
ValueS.Append("'" + InsertBags[i].Value + "',");
}
if (InsertBags.Count == 0)
{
throw new Exception("InsertBag 資料包為空白，睜大你的狗眼……");
}
else
{
//Drop the last "," from the ColumnS and ValueS
ColumnS = ColumnS.Remove(ColumnS.Length - 1, 1);
ValueS = ValueS.Remove(ValueS.Length - 1, 1);
}
//Insert
DbCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into [" + TargetTable + "] (" + ColumnS.ToString() + ") values (" + ValueS.ToString() + ")";
cmd.ExecuteNonQuery();
return true;
}
}
catch (Exception E)
{
MessageBox.Show(E.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return false;
}
}

目測有點複雜呢，來個Demo，有必要說下，“W2”和“W44”是已經設計好的欄位，而“TableTest”是已經添加好的表段 複製代碼 代碼如下:List<Sqlite.InsertBag> Lst = new List<Sqlite.InsertBag>();
Lst.Add(new Sqlite.InsertBag("W2", "222222222"));
Lst.Add(new Sqlite.InsertBag("W44", "4444444"));
Sqlite.Insert(@"D:\1.Sql3", "TableTest", Lst);

表段擷取： 複製代碼 代碼如下:/// <summary>
/// Get Tables From Sqlite
/// </summary>
/// <returns>list of Tables</returns>
public static List<string> GetTables(string DataSource)
{
List<string> ResultLst = new List<string>();
using (SQLiteConnection conn = new SQLiteConnection("Data Source=" + DataSource))
{
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, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
}
return ResultLst;
}

欄位擷取： 複製代碼 代碼如下:/// <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)
{
List<string> WordsLst = new List<string>();
using (SQLiteConnection conn = new SQLiteConnection("Data Source=" + DataSource))
{
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, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
return WordsLst;
}

解釋下，為啥代碼中的注釋基本都用英文寫了，因為這段時間在學雙拼- -。可是還不太熟悉，打字超慢，而且Code的時候容易打斷思路，好在~英文不多，而且這些都看不懂的話你……你要向我解釋一下你是怎麼一路學到資料庫的 0。