Sqlite 函数封装 Sqlite 常用函数封装提高Codeeer的效率

时间:2021-03-19 人气:0

想了解Sqlite 常用函数封装提高Codeeer的效率的相关内容吗，在本文为您仔细讲解Sqlite 函数封装的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：函数,封装,Codeeer，下面大家一起来学习吧。

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。

创建：

复制代码代码如下:

 
/// <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; 
} 
} 

删除：

复制代码代码如下:

 
/// <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：
这里要说明下，因为存在多字段同时插入的情况（何止存在，很普遍- -。没见过谁的数据库像意大利面条一样）

在这里设计了Insert结构用以储存字段和值的关系（曾考虑过用数组的办法实现，可是那玩意不太方便调用，瞅着挺抽象的，不太好用，如果有更好的建议，欢迎留言~）

复制代码代码如下:

 
/// <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; 
} 
} 

以下为插入模块的主函数：

复制代码代码如下:

 
/// <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 数据包为空，睁大你的狗眼……"); 
} 
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; 
} 
} 

目测有点复杂呢，来个Demo，有必要说下，“W2”和“W44”是已经设计好的字段，而“TableTest”是已经添加好的表段

复制代码代码如下:

 
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); 

表段获取：

复制代码代码如下:

 
/// <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; 
} 

字段获取：

复制代码代码如下:

 
/// <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。

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