613 lines
21 KiB
C#
613 lines
21 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Specialized;
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using System.Data;
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using System.Data.SQLite;
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using System.Configuration;
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public class SQLiteHelper
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{
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//数据库连接字符串
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// public static string connectionString = ConfigurationManager.ConnectionStrings["ProcessDB"].ConnectionString;
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public static string connectionString = "Data Source =D:\\huarui\\database\\ProcessDB.db;BinaryGUID=False;";
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public SQLiteHelper() { }
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#region 公用方法
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public static int GetMaxID(string FieldName, string TableName)
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{
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string strsql = "select max(" + FieldName + ")+1 from " + TableName;
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object obj = GetSingle(strsql);
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if (obj == null)
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{
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return 1;
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}
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else
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{
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return int.Parse(obj.ToString());
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}
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}
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public static bool Exists(string strSql)
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{
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object obj = GetSingle(strSql);
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int cmdresult;
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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cmdresult = 0;
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}
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else
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{
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cmdresult = int.Parse(obj.ToString());
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}
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if (cmdresult == 0)
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{
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return false;
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}
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else
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{
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return true;
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}
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}
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public static bool Exists(string strSql, params SQLiteParameter[] cmdParms)
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{
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object obj = GetSingle(strSql, cmdParms);
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int cmdresult;
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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cmdresult = 0;
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}
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else
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{
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cmdresult = int.Parse(obj.ToString());
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}
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if (cmdresult == 0)
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{
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return false;
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}
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else
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{
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return true;
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}
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}
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#endregion
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#region 执行简单SQL语句
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/// <summary>
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/// 执行SQL语句，返回影响的记录数
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSql(string SQLString)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
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{
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try
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{
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connection.Open();
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int rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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connection.Close();
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throw new Exception(E.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行SQL语句，设置命令的执行等待时间
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/// </summary>
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/// <param name="SQLString"></param>
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/// <param name="Times"></param>
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/// <returns></returns>
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public static int ExecuteSqlByTime(string SQLString, int Times)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
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{
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try
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{
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connection.Open();
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cmd.CommandTimeout = Times;
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int rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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connection.Close();
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throw new Exception(E.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行多条SQL语句，实现数据库事务。
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/// </summary>
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/// <param name="SQLStringList">多条SQL语句</param>
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public static bool ExecuteSqlTran(ArrayList SQLStringList)
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{
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bool isSuccess = false;
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using (SQLiteConnection conn = new SQLiteConnection(connectionString))
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{
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conn.Open();
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SQLiteCommand cmd = new SQLiteCommand();
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cmd.Connection = conn;
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cmd.CommandText = "PRAGMA synchronous = OFF;";
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cmd.ExecuteNonQuery();
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SQLiteTransaction tx = conn.BeginTransaction();
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cmd.Transaction = tx;
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try
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{
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for (int n = 0; n < SQLStringList.Count; n++)
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{
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string strsql = SQLStringList[n].ToString();
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if (strsql.Trim().Length > 1)
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{
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cmd.CommandText = strsql;
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cmd.ExecuteNonQuery();
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}
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}
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tx.Commit();
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isSuccess = true;
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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tx.Rollback();
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isSuccess = false;
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throw new Exception(E.Message);
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}
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}
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return isSuccess;
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}
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/// <summary>
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/// 执行带一个存储过程参数的的SQL语句。
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <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>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSql(string SQLString, string content)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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SQLiteCommand cmd = new SQLiteCommand(SQLString, connection);
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SQLiteParameter myParameter = new SQLiteParameter("@content", DbType.String);
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myParameter.Value = content;
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cmd.Parameters.Add(myParameter);
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try
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{
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connection.Open();
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int rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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throw new Exception(E.Message);
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}
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finally
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{
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cmd.Dispose();
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connection.Close();
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}
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}
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}
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/// <summary>
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/// 执行带一个存储过程参数的的SQL语句。
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <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>
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/// <returns>影响的记录数</returns>
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public static object ExecuteSqlGet(string SQLString, string content)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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SQLiteCommand cmd = new SQLiteCommand(SQLString, connection);
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SQLiteParameter myParameter = new SQLiteParameter("@content", DbType.String);
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myParameter.Value = content;
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cmd.Parameters.Add(myParameter);
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try
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{
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connection.Open();
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object obj = cmd.ExecuteScalar();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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throw new Exception(E.Message);
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}
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finally
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{
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cmd.Dispose();
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connection.Close();
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}
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}
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}
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/// <summary>
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/// 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)
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/// </summary>
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/// <param name="strSQL">SQL语句</param>
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/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
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SQLiteParameter myParameter = new SQLiteParameter("@fs", DbType.Binary);
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myParameter.Value = fs;
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cmd.Parameters.Add(myParameter);
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try
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{
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connection.Open();
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int rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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throw new Exception(E.Message);
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}
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finally
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{
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cmd.Dispose();
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connection.Close();
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}
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}
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}
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/// <summary>
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/// 执行一条计算查询结果语句，返回查询结果（object）。
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/// </summary>
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/// <param name="SQLString">计算查询结果语句</param>
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/// <returns>查询结果（object）</returns>
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public static object GetSingle(string SQLString)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand cmd = new SQLiteCommand(SQLString, connection))
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{
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try
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{
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connection.Open();
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object obj = cmd.ExecuteScalar();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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catch (System.Data.SQLite.SQLiteException e)
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{
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connection.Close();
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throw new Exception(e.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行查询语句，返回SQLiteDataReader(使用该方法切记要手工关闭SQLiteDataReader和连接)
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/// </summary>
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/// <param name="strSQL">查询语句</param>
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/// <returns>SQLiteDataReader</returns>
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public static SQLiteDataReader ExecuteReader(string strSQL)
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{
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SQLiteConnection connection = new SQLiteConnection(connectionString);
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SQLiteCommand cmd = new SQLiteCommand(strSQL, connection);
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try
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{
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connection.Open();
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SQLiteDataReader myReader = cmd.ExecuteReader();
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return myReader;
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}
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catch (System.Data.SQLite.SQLiteException e)
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{
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throw new Exception(e.Message);
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}
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//finally //不能在此关闭，否则，返回的对象将无法使用
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//{
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// cmd.Dispose();
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// connection.Close();
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//}
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}
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/// <summary>
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/// 执行查询语句，返回DataSet
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/// </summary>
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/// <param name="SQLString">查询语句</param>
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/// <returns>DataSet</returns>
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public static DataSet Query(string SQLString)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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DataSet ds = new DataSet();
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try
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{
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connection.Open();
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SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
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command.Fill(ds, "ds");
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connection.Close();
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command.Dispose();
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}
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catch (System.Data.SQLite.SQLiteException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds;
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}
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}
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public static DataSet Query(string SQLString, string TableName)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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DataSet ds = new DataSet();
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try
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{
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connection.Open();
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SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
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command.Fill(ds, TableName);
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}
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catch (System.Data.SQLite.SQLiteException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds;
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}
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}
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/// <summary>
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/// 执行查询语句，返回DataSet,设置命令的执行等待时间
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/// </summary>
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/// <param name="SQLString"></param>
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/// <param name="Times"></param>
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/// <returns></returns>
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public static DataSet Query(string SQLString, int Times)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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DataSet ds = new DataSet();
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try
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{
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connection.Open();
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SQLiteDataAdapter command = new SQLiteDataAdapter(SQLString, connection);
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command.SelectCommand.CommandTimeout = Times;
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command.Fill(ds, "ds");
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}
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catch (System.Data.SQLite.SQLiteException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds;
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}
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}
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#endregion
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#region 执行带参数的SQL语句
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/// <summary>
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/// 执行SQL语句，返回影响的记录数
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <returns>影响的记录数</returns>
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public static int ExecuteSql(string SQLString, params SQLiteParameter[] cmdParms)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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int rows = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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return rows;
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}
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catch (System.Data.SQLite.SQLiteException E)
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{
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throw new Exception(E.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行多条SQL语句，实现数据库事务。
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/// </summary>
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/// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SQLiteParameter[]）</param>
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public static void ExecuteSqlTran(Hashtable SQLStringList)
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{
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using (SQLiteConnection conn = new SQLiteConnection(connectionString))
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{
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conn.Open();
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using (SQLiteTransaction trans = conn.BeginTransaction())
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{
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SQLiteCommand cmd = new SQLiteCommand();
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try
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{
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//循环
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foreach (DictionaryEntry myDE in SQLStringList)
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{
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string cmdText = myDE.Key.ToString();
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SQLiteParameter[] cmdParms = (SQLiteParameter[])myDE.Value;
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PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
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int val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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}
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trans.Commit();
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}
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catch (System.Data.SQLite.SQLiteException e)
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{
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trans.Rollback();
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throw new Exception(e.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行一条计算查询结果语句，返回查询结果（object）。
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/// </summary>
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/// <param name="SQLString">计算查询结果语句</param>
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/// <returns>查询结果（object）</returns>
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public static object GetSingle(string SQLString, params SQLiteParameter[] cmdParms)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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object obj = cmd.ExecuteScalar();
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cmd.Parameters.Clear();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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catch (System.Data.SQLite.SQLiteException e)
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{
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throw new Exception(e.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行查询语句，返回SQLiteDataReader (使用该方法切记要手工关闭SQLiteDataReader和连接)
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/// </summary>
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/// <param name="strSQL">查询语句</param>
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/// <returns>SQLiteDataReader</returns>
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public static SQLiteDataReader ExecuteReader(string SQLString, params SQLiteParameter[] cmdParms)
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{
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SQLiteConnection connection = new SQLiteConnection(connectionString);
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SQLiteCommand cmd = new SQLiteCommand();
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try
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{
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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SQLiteDataReader myReader = cmd.ExecuteReader();
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cmd.Parameters.Clear();
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return myReader;
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}
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catch (System.Data.SQLite.SQLiteException e)
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{
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throw new Exception(e.Message);
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}
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//finally //不能在此关闭，否则，返回的对象将无法使用
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//{
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// cmd.Dispose();
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// connection.Close();
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//}
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}
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/// <summary>
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/// 执行查询语句，返回DataSet
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/// </summary>
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/// <param name="SQLString">查询语句</param>
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/// <returns>DataSet</returns>
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public static DataSet Query(string SQLString, params SQLiteParameter[] cmdParms)
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{
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using (SQLiteConnection connection = new SQLiteConnection(connectionString))
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{
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SQLiteCommand cmd = new SQLiteCommand();
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PrepareCommand(cmd, connection, null, SQLString, cmdParms);
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using (SQLiteDataAdapter da = new SQLiteDataAdapter(cmd))
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{
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DataSet ds = new DataSet();
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try
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{
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da.Fill(ds, "ds");
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cmd.Parameters.Clear();
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}
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catch (System.Data.SQLite.SQLiteException ex)
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{
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throw new Exception(ex.Message);
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}
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return ds;
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}
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}
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}
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public 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 parameter in cmdParms)
|
||
{
|
||
if ((parameter.Direction == ParameterDirection.InputOutput
|
||
|| parameter.Direction == ParameterDirection.Input) &&
|
||
(parameter.Value == null))
|
||
{
|
||
parameter.Value = DBNull.Value;
|
||
}
|
||
cmd.Parameters.Add(parameter);
|
||
}
|
||
}
|
||
}
|
||
|
||
#endregion
|
||
|
||
#region 参数转换
|
||
/// <summary>
|
||
/// 放回一个SQLiteParameter
|
||
/// </summary>
|
||
/// <param name="name">参数名字</param>
|
||
/// <param name="type">参数类型</param>
|
||
/// <param name="size">参数大小</param>
|
||
/// <param name="value">参数值</param>
|
||
/// <returns>SQLiteParameter的值</returns>
|
||
public static SQLiteParameter MakeSQLiteParameter(string name,
|
||
DbType type, int size, object value)
|
||
{
|
||
SQLiteParameter parm = new SQLiteParameter(name, type, size);
|
||
parm.Value = value;
|
||
return parm;
|
||
}
|
||
|
||
public static SQLiteParameter MakeSQLiteParameter(string name, DbType type, object value)
|
||
{
|
||
SQLiteParameter parm = new SQLiteParameter(name, type);
|
||
parm.Value = value;
|
||
return parm;
|
||
}
|
||
|
||
#endregion
|
||
}
|