也许你想成为太阳，可你却只是一颗星辰；也许你想成为大树，可你却是一棵小草。于是，你有些自卑。其实，你和别人一样，也是一片风景：做不了太阳，就做星辰，在自我的星座发光发热；做不了大树，就做小草，以自我的绿色装点期望……
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：
/// <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：
/// <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~）
/// <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：
/// <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
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：
/// <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：
/// <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。
本文Sqlite 常用函数封装提高Codeeer的效率到此结束。人走到喧华的群众中去，是为了淹没他自我沉默的呼号。小编再次感谢大家对我们的支持！
