SQLiteHelper类，操作SQLite数据库
using System;
using System.Data;
using System.Text.RegularExpressions;
using System.Xml;
using System.IO;
using System.Collections;
using System.Data.SQLite;
using System.Configuration;//添加.net引用
namespace Tools.Common
{
/// <summary>
/// 对SQLite操作的类
/// 引用：System.Data.SQLite.dll【版本：3.6.23.1（原始文件名：SQlite3.DLL）】
/// </summary>
public class SQLiteHelper
{
/// <summary>
/// 所有成员函数都是静态的，构造函数定义为私有
/// </summary>
private SQLiteHelper()
{
}
/// <summary>
/// 连接字符串
/// </summary>
public static string ConnectionString
{//"Data Source=Test.db3;Pooling=true;FailIfMissing=false";
get
{
////(AppSettings节点下的"SQLiteConnectionString")
string text = ConfigurationManager.AppSettings["SQLiteConnectionString"];
string str2 = ConfigurationManager.AppSettings["IsEncrypt"];
if (str2 == "true")
{
text = DesEncrypt.Decrypt(text);
}
return text;
}
}
private static SQLiteConnection _Conn = null;
/// <summary>
/// 连接对象
/// </summary>
public static SQLiteConnection Conn
{
get
{
if (_Conn == null) _Conn = new SQLiteConnection(ConnectionString);
return SQLiteHelper._Conn;
}
set { SQLiteHelper._Conn = value; }
}
#region CreateCommand(commandText,SQLiteParameter[])
/// <summary>
/// 创建命令
/// </summary>
/// <param name="connection">连接</param>
/// <param name="commandText">语句</param>
/// <param name="commandParameters">语句参数.</param>
/// <returns>SQLite Command</returns>
public static SQLiteCommand CreateCommand(string commandText, params SQLiteParameter[] commandParameters)
{
SQLiteCommand cmd = new SQLiteCommand(commandText, Conn);
if (commandParameters.Length > 0)
{
foreach (SQLiteParameter parm in commandParameters)
cmd.Parameters.Add(parm);
}
return cmd;
}
#endregion
#region CreateParameter(parameterName,parameterType,parameterValue)
/// <summary>
/// 创建参数
/// </summary>
/// <param name="parameterName">参数名</param>
/// <param name="parameterType">参数类型</param>
/// <param name="parameterValue">参数值</param>
/// <returns>返回创建的参数</returns>
public static SQLiteParameter CreateParameter(string parameterName, System.Data.DbType parameterType, object parameterValue)
{
SQLiteParameter parameter = new SQLiteParameter();
parameter.DbType = parameterType;
parameter.ParameterName = parameterName;
parameter.Value = parameterValue;
return parameter;
}
#endregion
#region ExecuteDataSet(commandText,paramList[])
/// <summary>
/// 查询数据集
/// </summary>
/// <param name="cn">连接.</param>
/// <param name="commandText">查询语句.</param>
/// <param name="paramList">object参数列表.</param>
/// <returns></returns>
public static DataSet ExecuteDataSet( string commandText,params object[] paramList)
{
SQLiteCommand cmd = Conn.CreateCommand();
cmd.CommandText = commandText;
if (paramList != null)
{
AttachParameters(cmd, commandText, paramList);
}
DataSet ds = new DataSet();
if (Conn.State == ConnectionState.Closed)
Conn.Open();
SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
da.Fill(ds);
da.Dispose();
cmd.Dispose();
Conn.Close();
return ds;
}
#endregion
#region ExecuteDataSet(SQLiteCommand)
/// <summary>
/// 查询数据集
/// </summary>
/// <param name="cmd">SQLiteCommand对象</param>
/// <returns>返回数据集</returns>
public static DataSet ExecuteDataSet(SQLiteCommand cmd)
{
if (cmd.Connection.State == ConnectionState.Closed)
cmd.Connection.Open();
DataSet ds = new DataSet();
SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
da.Fill(ds);
da.Dispose();
cmd.Connection.Close();
cmd.Dispose();
return ds;
}
#endregion
#region ExecuteDataSet(SQLiteTransaction,commandText,params SQLiteParameter[])
/// <summary>
/// 查询数据集
/// </summary>
/// <param name="transaction">SQLiteTransaction对象. </param>
/// <param name="commandText">查询语句.</param>
/// <param name="commandParameters">命令的参数列表.</param>
/// <returns>DataSet</returns>
/// <remarks>必须手动执行关闭连接transaction.connection.Close</remarks>
public static DataSet ExecuteDataSet(SQLiteTransaction transaction, string commandText, params SQLiteParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or committed, please provide an open transaction.", "transaction");
IDbCommand cmd = transaction.Connection.CreateCommand();
cmd.CommandText = commandText;
foreach (SQLiteParameter parm in commandParameters)
{
cmd.Parameters.Add(parm);
}
if (transaction.Connection.State == ConnectionState.Closed)
transaction.Connection.Open();
DataSet ds = ExecuteDataSet((SQLiteCommand)cmd);
return ds;
}
#endregion
#region ExecuteDataSet(SQLiteTransaction,commandText,object[] commandParameters)
/// <summary>
/// 查询数据集
/// </summary>
/// <param name="transaction">SQLiteTransaction对象 </param>
/// <param name="commandText">查询语句.</param>
/// <param name="commandParameters">命令参数列表</param>
/// <returns>返回数据集</returns>
/// <remarks>必须手动执行关闭连接transaction.connection.Close</remarks>
public static DataSet ExecuteDataSet(SQLiteTransaction transaction, string commandText, object[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or committed, please provide an open transaction.", "transaction");
IDbCommand cmd = transaction.Connection.CreateCommand();
cmd.CommandText = commandText;
AttachParameters((SQLiteCommand)cmd, cmd.CommandText, commandParameters);
if (transaction.Connection.State == ConnectionState.Closed)
transaction.Connection.Open();
DataSet ds = ExecuteDataSet((SQLiteCommand)cmd);
return ds;
}
#endregion
#region UpdateDataset(insertCommand,deleteCommand,updateCommand,dataSet,tableName)
/// <summary>
/// 更新数据集中数据到数据库
/// </summary>
/// <param name="insertCommand">insert语句</param>
/// <param name="deleteCommand">delete语句</param>
/// <param name="updateCommand">update语句</param>
/// <param name="dataSet">要更新的DataSet</param>
/// <param name="tableName">数据集中要更新的table名</param>
public static void UpdateDataset(SQLiteCommand insertCommand, SQLiteCommand deleteCommand, SQLiteCommand updateCommand, DataSet dataSet, string tableName)
{
if (insertCommand == null) throw new ArgumentNullException("insertCommand");
if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
if (updateCommand == null) throw new ArgumentNullException("updateCommand");
if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");
// Create a SQLiteDataAdapter, and dispose of it after we are done
using (SQLiteDataAdapter dataAdapter = new SQLiteDataAdapter())
{
// Set the data adapter commands
dataAdapter.UpdateCommand = updateCommand;
dataAdapter.InsertCommand = insertCommand;
dataAdapter.DeleteCommand = deleteCommand;
// Update the dataset changes in the data source
dataAdapter.Update(dataSet, tableName);
// Commit all the changes made to the DataSet
dataSet.AcceptChanges();
}
}
#endregion
#region ExecuteReader(SQLiteCommand,commandText, object[] paramList)
/// <summary>
/// ExecuteReader方法
/// </summary>
/// <param name="cmd">查询命令</param>
/// <param name="commandText">含有类似@colume参数的sql语句</param>
/// <param name="paramList">语句参数列表</param>
/// <returns>IDataReader</returns>
public static IDataReader ExecuteReader(SQLiteCommand cmd, string commandText, object[] paramList)
{
if (cmd.Connection == null)
throw new ArgumentException("没有为命令指定活动的连接.", "cmd");
cmd.CommandText = commandText;
AttachParameters(cmd, commandText, paramList);
if (cmd.Connection.State == ConnectionState.Closed)
cmd.Connection.Open();
IDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return rdr;
}
#endregion
#region ExecuteNonQuery(commandText,paramList)
/// <summary>
/// 执行ExecuteNonQuery方法
/// </summary>
/// <param name="cn">连接</param>
/// <param name="commandText">语句</param>
/// <param name="paramList">参数</param>
/// <returns></returns>
public static int ExecuteNonQuery(string commandText, params object[] paramList)
{
SQLiteCommand cmd = Conn.CreateCommand();
cmd.CommandText = commandText;
AttachParameters(cmd, commandText, paramList);
if (Conn.State == ConnectionState.Closed)
Conn.Open();
int result = cmd.ExecuteNonQuery();
cmd.Dispose();
Conn.Close();
return result;
}
#endregion
#region ExecuteNonQuery(SQLiteTransaction,commandText,paramList)
/// <summary>
/// 执行ExecuteNonQuery方法,带事务
/// </summary>
/// <param name="transaction">之前创建好的SQLiteTransaction对象</param>
/// <param name="commandText">语句.</param>
/// <param name="paramList">参数.</param>
/// <returns>返回影响的行数</returns>
/// <remarks>
/// 定义事务 DbTransaction trans = conn.BeginTransaction();
/// 或者：SQLiteTransaction trans = Conn.BeginTransaction();
/// 操作代码示例：
/// try
///{
/// // 连续操作记录
/// for (int i = 0; i < 1000; i++)
/// {
/// ExecuteNonQuery(trans,commandText,[] paramList);
/// }
/// trans.Commit();
///}
///catch
///{
/// trans.Rollback();
/// throw;
///}
///trans.Connection.Close();//关闭事务连接
///transaction.Dispose();//释放事务对象
/// </remarks>
public static int ExecuteNonQuery(SQLiteTransaction transaction, string commandText, params object[] paramList)
{
if (transaction == null) throw new ArgumentNullException("transaction is null");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rolled back or committed,please provide an open transaction.", "transaction");
using (IDbCommand cmd = transaction.Connection.CreateCommand())
{
cmd.CommandText = commandText;
AttachParameters((SQLiteCommand)cmd, cmd.CommandText, paramList);
if (transaction.Connection.State == ConnectionState.Closed)
transaction.Connection.Open();
int result = cmd.ExecuteNonQuery();
return result;
}
}
#endregion
#region ExecuteNonQuery(IDbCommand)
/// <summary>
/// 执行ExecuteNonQuery方法
/// </summary>
/// <param name="cmd">创建好的命令.</param>
/// <returns></returns>
public static int ExecuteNonQuery(IDbCommand cmd)
{
if (cmd.Connection.State == ConnectionState.Closed)
cmd.Connection.Open();
int result = cmd.ExecuteNonQuery();
cmd.Connection.Close();
cmd.Dispose();
return result;
}
#endregion
#region ExecuteScalar(commandText,paramList)
/// <summary>
/// 执行ExecuteScalar
/// </summary>
/// <param name="commandText">语句s</param>
/// <param name="paramList">参数</param>
/// <returns></returns>
public static object ExecuteScalar(string commandText, params object[] paramList)
{
SQLiteConnection cn = new SQLiteConnection(ConnectionString);
SQLiteCommand cmd = cn.CreateCommand();
cmd.CommandText = commandText;
AttachParameters(cmd, commandText, paramList);
if (cn.State == ConnectionState.Closed)
cn.Open();
object result = cmd.ExecuteScalar();
cmd.Dispose();
cn.Close();
return result;
}
#endregion
#region ExecuteXmlReader(IDbCommand)
/// <summary>
/// ExecuteXmlReader返回xml格式
/// </summary>
/// <param name="command">语句</param>
/// <returns>返回XmlTextReader对象</returns>
public static XmlReader ExecuteXmlReader(IDbCommand command)
{ // open the connection if necessary, but make sure we
// know to close it when we�re done.
if (command.Connection.State != ConnectionState.Open)
{
command.Connection.Open();
}
// get a data adapter
SQLiteDataAdapter da = new SQLiteDataAdapter((SQLiteCommand)command);
DataSet ds = new DataSet();
// fill the data set, and return the schema information
da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
da.Fill(ds);
// convert our dataset to XML
StringReader stream = new StringReader(ds.GetXml());
command.Connection.Close();
// convert our stream of text to an XmlReader
return new XmlTextReader(stream);
}
#endregion
#region AttachParameters(SQLiteCommand,commandText,object[] paramList)
/// <summary>
/// 增加参数到命令（自动判断类型）
/// </summary>
/// <param name="commandText">命令语句</param>
/// <param name="paramList">object参数列表</param>
/// <returns>返回SQLiteParameterCollection参数列表</returns>
/// <remarks>Status experimental. Regex appears to be handling most issues. Note that parameter object array must be in same ///order as parameter names appear in SQL statement.</remarks>
private static SQLiteParameterCollection AttachParameters(SQLiteCommand cmd, string commandText, params object[] paramList)
{
if (paramList == null || paramList.Length == 0) return null;
SQLiteParameterCollection coll = cmd.Parameters;
string parmString = commandText.Substring(commandText.IndexOf("@"));
// pre-process the string so always at least 1 space after a comma.
parmString = parmString.Replace(",", " ,");
// get the named parameters into a match collection
string pattern = @"(@)\S*(.*?)\b";
Regex ex = new Regex(pattern, RegexOptions.IgnoreCase);
MatchCollection mc = ex.Matches(parmString);
string[] paramNames = new string[mc.Count];
int i = 0;
foreach (Match m in mc)
{
paramNames[i] = m.Value;
i++;
}
// now let's type the parameters
int j = 0;
Type t = null;
foreach (object o in paramList)
{
t = o.GetType();
SQLiteParameter parm = new SQLiteParameter();
switch (t.ToString())
{
case ("DBNull"):
case ("Char"):
case ("SByte"):
case ("UInt16"):
case ("UInt32"):
case ("UInt64"):
throw new SystemException("Invalid data type");
case ("System.String"):
parm.DbType = DbType.String;
parm.ParameterName = paramNames[j];
parm.Value = (string)paramList[j];
coll.Add(parm);
break;
case ("System.Byte[]"):
parm.DbType = DbType.Binary;
parm.ParameterName = paramNames[j];
parm.Value = (byte[])paramList[j];
coll.Add(parm);
break;
case ("System.Int32"):
parm.DbType = DbType.Int32;
parm.ParameterName = paramNames[j];
parm.Value = (int)paramList[j];
coll.Add(parm);
break;
case ("System.Boolean"):
parm.DbType = DbType.Boolean;
parm.ParameterName = paramNames[j];
parm.Value = (bool)paramList[j];
coll.Add(parm);
break;
case ("System.DateTime"):
parm.DbType = DbType.DateTime;
parm.ParameterName = paramNames[j];
parm.Value = Convert.ToDateTime(paramList[j]);
coll.Add(parm);
break;
case ("System.Double"):
parm.DbType = DbType.Double;
parm.ParameterName = paramNames[j];
parm.Value = Convert.ToDouble(paramList[j]);
coll.Add(parm);
break;
case ("System.Decimal"):
parm.DbType = DbType.Decimal;
parm.ParameterName = paramNames[j];
parm.Value = Convert.ToDecimal(paramList[j]);
break;
case ("System.Guid"):
parm.DbType = DbType.Guid;
parm.ParameterName = paramNames[j];
parm.Value = (System.Guid)(paramList[j]);
break;
case ("System.Object"):
parm.DbType = DbType.Object;
parm.ParameterName = paramNames[j];
parm.Value = paramList[j];
coll.Add(parm);
break;
default:
throw new SystemException("Value is of unknown data type");
} // end switch
j++;
}
return coll;
}
#endregion
#region ExecuteNonQueryTypedParams(IDbCommand, DataRow)
/// <summary>
/// Executes non query typed params from a DataRow
/// </summary>
/// <param name="command">Command.</param>
/// <param name="dataRow">Data row.</param>
/// <returns>Integer result code</returns>
public static int ExecuteNonQueryTypedParams(IDbCommand command, DataRow dataRow)
{
int retVal = 0;
// If the row has values, the store procedure parameters must be initialized
if (dataRow != null && dataRow.ItemArray.Length > 0)
{
// Set the parameters values
AssignParameterValues(command.Parameters, dataRow);
retVal = ExecuteNonQuery(command);
}
else
{
retVal = ExecuteNonQuery(command);
}
return retVal;
}
#endregion
#region AssignParameterValues
/// <summary>
/// This method assigns dataRow column values to an IDataParameterCollection
/// </summary>
/// <param name="commandParameters">The IDataParameterCollection to be assigned values</param>
/// <param name="dataRow">The dataRow used to hold the command's parameter values</param>
/// <exception cref="System.InvalidOperationException">Thrown if any of the parameter names are invalid.</exception>
protected internal static void AssignParameterValues(IDataParameterCollection commandParameters, DataRow dataRow)
{
if (commandParameters == null || dataRow == null)
{
// Do nothing if we get no data
return;
}
DataColumnCollection columns = dataRow.Table.Columns;
int i = 0;
// Set the parameters values
foreach (IDataParameter commandParameter in commandParameters)
{
// Check the parameter name
if (commandParameter.ParameterName == null ||
commandParameter.ParameterName.Length <= 1)
throw new InvalidOperationException(string.Format(
"Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
i, commandParameter.ParameterName));
if (columns.Contains(commandParameter.ParameterName))
commandParameter.Value = dataRow[commandParameter.ParameterName];
else if (columns.Contains(commandParameter.ParameterName.Substring(1)))
commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
i++;
}
}
#endregion
#region AssignParameterValues
/// <summary>
/// This method assigns dataRow column values to an array of IDataParameters
/// </summary>
/// <param name="commandParameters">Array of IDataParameters to be assigned values</param>
/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
/// <exception cref="System.InvalidOperationException">Thrown if any of the parameter names are invalid.</exception>
protected void AssignParameterValues(IDataParameter[] commandParameters, DataRow dataRow)
{
if ((commandParameters == null) || (dataRow == null))
{
// Do nothing if we get no data
return;
}
DataColumnCollection columns = dataRow.Table.Columns;
int i = 0;
// Set the parameters values
foreach (IDataParameter commandParameter in commandParameters)
{
// Check the parameter name
if (commandParameter.ParameterName == null ||
commandParameter.ParameterName.Length <= 1)
throw new InvalidOperationException(string.Format(
"Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
i, commandParameter.ParameterName));
if (columns.Contains(commandParameter.ParameterName))
commandParameter.Value = dataRow[commandParameter.ParameterName];
else if (columns.Contains(commandParameter.ParameterName.Substring(1)))
commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
i++;
}
}
#endregion
#region AssignParameterValues
/// <summary>
/// This method assigns an array of values to an array of IDataParameters
/// </summary>
/// <param name="commandParameters">Array of IDataParameters to be assigned values</param>
/// <param name="parameterValues">Array of objects holding the values to be assigned</param>
/// <exception cref="System.ArgumentException">Thrown if an incorrect number of parameters are passed.</exception>
protected void AssignParameterValues(IDataParameter[] commandParameters, params object[] parameterValues)
{
if ((commandParameters == null) || (parameterValues == null))
{
// Do nothing if we get no data
return;
}
// We must have the same number of values as we pave parameters to put them in
if (commandParameters.Length != parameterValues.Length)
{
throw new ArgumentException("Parameter count does not match Parameter Value count.");
}
// Iterate through the IDataParameters, assigning the values from the corresponding position in the
// value array
for (int i = 0, j = commandParameters.Length, k = 0; i < j; i++)
{
if (commandParameters[i].Direction != ParameterDirection.ReturnValue)
{
// If the current array value derives from IDataParameter, then assign its Value property
if (parameterValues[k] is IDataParameter)
{
IDataParameter paramInstance;
paramInstance = (IDataParameter)parameterValues[k];
if (paramInstance.Direction == ParameterDirection.ReturnValue)
{
paramInstance = (IDataParameter)parameterValues[++k];
}
if (paramInstance.Value == null)
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = paramInstance.Value;
}
}
else if (parameterValues[k] == null)
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = parameterValues[k];
}
k++;
}
}
}
#endregion
}
}
<appSettings>
<add key="SQLiteConnectionString" value="Data Source=Test.db3;Pooling=true;FailIfMissing=false"/>
</appSettings>