C#封装的JS(JavaScript)操作类的代码
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C#封装的Sqlite访问类的代码
把做工程过程中重要的内容段备份一次，如下内容是关于C#封装的Sqlite访问类的内容，希望能对各位有一些用途。using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Configuration;
using System.Data.SQLite;
namespace DAL
internal abstract class DbHelperSQLite
public static string connectionString = "Data Source=" + AppDomain.CurrentDomain.BaseDirectory + @"dataleaf.db;Version=3;";
public DbHelperSQLite()
#region 公用方法
public static int GetMaxID(string FieldName, string TableName)
string strsql = "select max(" + FieldName + ")+1 from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
return 1;
else
return int.Parse(obj.ToString());
public static bool Exists(string strSql)
object obj = GetSingle(strSql);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
cmdresult = 0;
else
cmdresult = int.Parse(obj.ToString());
if (cmdresult == 0)
return false;
else
return true;
public static bool Exists(string strSql, params SQLiteParameter[] cmdParms)
object obj = GetSingle(strSql, cmdParms);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
cmdresult = 0;
else
cmdresult = int.Parse(obj.ToString());
if (cmdresult == 0)
return false;
else
return true;
#endregion
#region 执行简单SQL语句
public static int ExecuteSql(string SQLString)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
try
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
catch (System.Data.SQLite.SQLiteException E)
connection.Close();
throw new Exception(E.Message);
public static void ExecuteSqlTran(ArrayList SQLStringList)
using (SQLiteConnection conn = new SQLiteConnection(connectionString))
conn.Open();
SQLiteCommand cmd = new SQLiteCommand();
cmd.Connection = conn;
SQLiteTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
for (int n = 0; n < SQLStringList.Count; n++)
string strsql = SQLStringList[n].ToString();
if (strsql.Trim().Length > 1)
cmd.CommandText = strsql;
cmd.ExecuteNonQuery();
tx.Commit();
catch (System.Data.SQLite.SQLiteException E)
tx.Rollback();
throw new Exception(E.Message);
public static int ExecuteSql(string SQLString, string content)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
SQLiteCommand cmd = new SQLiteCommand(SQLString, connection);
SQLiteParameter myParameter = new SQLiteParameter("@content", DbType.String);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
catch (System.Data.SQLite.SQLiteException E)
throw new Exception(E.Message);
finally
cmd.Dispose();
connection.Close();
public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
SQLiteParameter myParameter = new SQLiteParameter("@fs", DbType.Binary);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
catch (System.Data.SQLite.SQLiteException E)
throw new Exception(E.Message);
finally
cmd.Dispose();
connection.Close();
public static object GetSingle(string SQLString)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
try
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
return null;
else
return obj;
catch (System.Data.SQLite.SQLiteException e)
connection.Close();
throw new Exception(e.Message);
public static SQLiteDataReader ExecuteReader(string strSQL)
SQLiteConnection connection = new SQLiteConnection(connectionString);
SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
try
connection.Open();
SQLiteDataReader myReader = cmd.ExecuteReader();
return myReader;
catch (System.Data.SQLite.SQLiteException e)
throw new Exception(e.Message);
public static DataSet Query(string SQLString)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
DataSet ds = new DataSet();
try
connection.Open();
SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
catch (System.Data.SQLite.SQLiteException ex)
throw new Exception(ex.Message);
return ds;
#endregion
#region 执行带参数的SQL语句
public static int ExecuteSql(string SQLString, params SQLiteParameter[] cmdParms)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
using (SQLiteCommand cmd = new SQLiteCommand())
try
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
catch (System.Data.SQLite.SQLiteException E)
throw new Exception(E.Message);
public static void ExecuteSqlTran(Hashtable SQLStringList)
using (SQLiteConnection conn = new SQLiteConnection(connectionString))
conn.Open();
using (SQLiteTransaction trans = conn.BeginTransaction())
SQLiteCommand cmd = new SQLiteCommand();
try
foreach (DictionaryEntry myDE in SQLStringList)
string cmdText = myDE.Key.ToString();
SQLiteParameter[] cmdParms = (SQLiteParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
catch
trans.Rollback();
throw;
public static object GetSingle(string SQLString, params SQLiteParameter[] cmdParms)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
using (SQLiteCommand cmd = new SQLiteCommand())
try
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
return null;
else
return obj;
catch (System.Data.SQLite.SQLiteException e)
throw new Exception(e.Message);
public static SQLiteDataReader ExecuteReader(string SQLString, params SQLiteParameter[] cmdParms)
SQLiteConnection connection = new SQLiteConnection(connectionString);
SQLiteCommand cmd = new SQLiteCommand();
try
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
SQLiteDataReader myReader = cmd.ExecuteReader();
cmd.Parameters.Clear();
return myReader;
catch (System.Data.SQLite.SQLiteException e)
throw new Exception(e.Message);
public static DataSet Query(string SQLString, params SQLiteParameter[] cmdParms)
using (SQLiteConnection connection = new SQLiteConnection(connectionString))
SQLiteCommand cmd = new SQLiteCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (SQLiteDataAdapter da = new SQLiteDataAdapter(cmd))
DataSet ds = new DataSet();
try
da.Fill(ds, "ds");
cmd.Parameters.Clear();
catch (System.Data.SQLite.SQLiteException ex)
throw new Exception(ex.Message);
return ds;
private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, SQLiteTransaction trans, string cmdText, SQLiteParameter[] cmdParms)
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
if (cmdParms != null)
foreach (SQLiteParameter parm in cmdParms)
cmd.Parameters.Add(parm);
#endregion
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