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SQLite通用数据库类，
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using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Configuration;
using System.Data.sqlite;
using System.Collections.Generic;
using System.Diagnostics;
using log4net;
using System.Windows.Forms;
namespace HBKSZYGL.DBUtility
{
/// <summary>
/// Copyright (C) 2011 Maticsoft
/// 数据访问基础类(基于sqlite)
/// 可以用户可以修改满足自己项目的需要。
/// </summary>
public abstract class DbHelpersqlite
{
//数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
//public static string connectionString = "Data Source= " + Application.StartupPath + "\\" + ClsAppCommon.AppCommon.dbSourcePath + ";Pooling=true;Min Pool Size=0;Max Pool Size=100;PublicKeyToken=db937bc2d44ff139;";
public static string connectionString = "Data Source= " + ClsAppCommon.AppCommon.dbSourcePath + "";
public static readonly ILog loggerDebug = log4net.LogManager.GetLogger("debug");//选择<logger name="debug">的配置
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,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
/// <summary>
/// 执行sql语句，返回影响的记录数
/// </summary>
/// <param name="sqlString">sql语句</param>
/// <returns>影响的记录数</returns>
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);
}
}
}
}
/// <summary>
/// 执行sql语句，实现数据库事务。
/// </summary>
/// <param name="sqlStringList">sql语句</param>
public static bool ExecutesqlTran(string sqlString)
{
using (sqliteConnection conn = new sqliteConnection(connectionString))
{
conn.Open();
sqliteCommand cmd = new sqliteCommand();
cmd.Connection = conn;
sqliteTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
cmd.CommandText = sqlString;
cmd.ExecuteNonQuery();
tx.Commit();
return true;
}
catch (System.Data.sqlite.sqliteException E)
{
tx.Rollback();
return false;
// throw new Exception(E.Message);
}
}
}
/// <summary>
/// 执行多条sql语句，实现数据库事务。
/// </summary>
/// <param name="sqlStringList">多条sql语句</param>
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);
}
}
}
/// <summary>
/// 执行多条插入sql语句，实现数据库事务。
/// </summary>
/// <param name="sqlStringList">执行的sql语句</param>
/// <param name="tableName">表名</param>
public static void ExecuteInsertsqlTran(ArrayList sqlStringList,string tableName)
{
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 = "INSERT INTO [" + tableName + "]" + strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch (System.Data.sqlite.sqliteException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
}
}
/// <summary>
/// 执行多条插入sql语句，实现数据库事务。
/// </summary>
/// <param name="sqlStringList">执行的sql语句</param>
public static bool ExecuteInsertsqlTran(List<string> sqlStringList)
{
using (sqliteConnection conn = new sqliteConnection(connectionString))
{
Stopwatch sw = new Stopwatch();
sw.Start();
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();
sw.Stop();
loggerDebug.Debug("批量插入sqlite:" + sqlStringList.Count + "条数据，所占时间:" + sw.ElapsedMilliseconds.ToString() + "毫秒");
return true;
}
catch (System.Data.sqlite.sqliteException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的sql语句。
/// </summary>
/// <param name="sqlString">sql语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
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();
}
}
}
/// <summary>
/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
/// </summary>
/// <param name="strsql">sql语句</param>
/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
/// <returns>影响的记录数</returns>
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();
}
}
}
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）。
/// </summary>
/// <param name="sqlString">计算查询结果语句</param>
/// <returns>查询结果（object）</returns>
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,System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.sqlite.sqliteException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
}
}
/// <summary>
/// 执行查询语句，返回sqliteDataReader
/// </summary>
/// <param name="strsql">查询语句</param>
/// <returns>sqliteDataReader</returns>
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);
}
}
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="sqlString">查询语句</param>
/// <returns>DataSet</returns>
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");
loggerDebug.Debug(sqlString);
}
catch (System.Data.sqlite.sqliteException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 执行带参数的sql语句
/// <summary>
/// 执行sql语句，返回影响的记录数
/// </summary>
/// <param name="sqlString">sql语句</param>
/// <returns>影响的记录数</returns>
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);
}
}
}
}
/// <summary>
/// 执行多条sql语句，实现数据库事务。
/// </summary>
/// <param name="sqlStringList">sql语句的哈希表（key为sql语句，value是该语句的sqliteParameter[]）</param>
public static void ExecutesqlTran(Hashtable sqlStringList)
{
using (sqliteConnection conn = new sqliteConnection(connectionString))
{
conn.Open();
using (sqliteTransaction trans = conn.BeginTransaction())
{
sqliteCommand cmd = new sqliteCommand();
try
{
//循环
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;
}
}
}
}
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）。
/// </summary>
/// <param name="sqlString">计算查询结果语句</param>
/// <returns>查询结果（object）</returns>
public static object GetSingle(string sqlString,cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj,System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.sqlite.sqliteException e)
{
throw new Exception(e.Message);
}
}
}
}
/// <summary>
/// 执行查询语句，返回sqliteDataReader
/// </summary>
/// <param name="strsql">查询语句</param>
/// <returns>sqliteDataReader</returns>
public static sqliteDataReader ExecuteReader(string sqlString,params sqliteParameter[] cmdParms)
{
sqliteConnection connection = new sqliteConnection(connectionString);
sqliteCommand cmd = new sqliteCommand();
try
{
PrepareCommand(cmd,cmdParms);
sqliteDataReader myReader = cmd.ExecuteReader();
cmd.Parameters.Clear();
return myReader;
}
catch (System.Data.sqlite.sqliteException e)
{
throw new Exception(e.Message);
}
}
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="sqlString">查询语句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string sqlString,params sqliteParameter[] cmdParms)
{
using (sqliteConnection connection = new sqliteConnection(connectionString))
{
sqliteCommand cmd = new sqliteCommand();
PrepareCommand(cmd,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;
cmd.CommandType = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (sqliteParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
}
}
