求问c#怎么中怎么做一个查询按钮对我的一个数据库进行模糊查询_c#吧_百度贴吧
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求问c#怎么中怎么做一个查询按钮对我的一个数据库进行模糊查询收藏
求问c#怎么中怎么做一个查询按钮对我的一个数据库进行模糊查询然后显示出来，求问代码是什么？
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select * from test where id like `%要模糊查询的字%`
每次查询时重新绑定一下gdv
登录百度帐号首先，需要连接SQLServer数据库的服务器名称server、数据库名database、数据库用户名uid以及密码pwd，如下图：
&然后需要以下数据库SQL代码段，还有一个myHelper.cs代码，粘贴复制即可：
DbHelperSQL.cs代码：
注意要更改红框中的内容
using System.C
using System.Collections.G
using System.D
using System.Data.SqlC
using System.C
namespace MTBug.sqlHelper
/// &summary&
/// 数据访问抽象基础类
/// Copyright (C) Maticsoft
/// &/summary&
public abstract class DbHelperSQL
//数据库连接字符串(web.config来配置)，多数据库可使用DbHelperSQLP来实现.
//public static string connectionString = @"server=database=MTBugLuid=pwd=123";
public static string connectionString = @"server=database=MTBugLuid=pwd=aaaaaa";
public DbHelperSQL()
//connectionString = @"server=" + System.Net.Dns.GetHostName() + ";database=TianZuid=pwd=" + myHelper.getXMLValue("dbUserPW");
connectionString = @"server=" + myHelper.getXMLValue("dbAddr") + ";database=MTBugLuid=pwd=" + myHelper.getXMLValue("dbUserPW");
#region 公用方法
/// &summary&
/// 判断是否存在某表的某个字段
/// &/summary&
/// &param name="tableName"&表名称&/param&
/// &param name="columnName"&列名称&/param&
/// &returns&是否存在&/returns&
public static bool ColumnExists(string tableName, string columnName)
string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
object res = GetSingle(sql);
if (res == null)
return false;
return Convert.ToInt32(res) & 0;
public static int GetMaxID(string FieldName, string TableName)
string strsql = "select max(" + FieldName + ")+1 from " + TableN
object obj = GetSingle(strsql);
if (obj == null)
return int.Parse(obj.ToString());
public static bool Exists(string strSql)
object obj = GetSingle(strSql);
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
cmdresult = 0;
cmdresult = int.Parse(obj.ToString()); //也可能=0
if (cmdresult == 0)
return false;
return true;
/// &summary&
/// 表是否存在
/// &/summary&
/// &param name="TableName"&&/param&
/// &returns&&/returns&
public static bool TabExists(string TableName)
string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
//string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
object obj = GetSingle(strsql);
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
cmdresult = 0;
cmdresult = int.Parse(obj.ToString());
if (cmdresult == 0)
return false;
return true;
public static bool Exists(string strSql, params SqlParameter[] cmdParms)
object obj = GetSingle(strSql, cmdParms);
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
cmdresult = 0;
cmdresult = int.Parse(obj.ToString());
if (cmdresult == 0)
return false;
return true;
#endregion
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 (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
connection.Open();
int rows = cmd.ExecuteNonQuery();
catch (System.Data.SqlClient.SqlException e)
connection.Close();
public static int ExecuteSqlByTime(string SQLString, int Times)
using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
connection.Open();
cmd.CommandTimeout = T
int rows = cmd.ExecuteNonQuery();
catch (System.Data.SqlClient.SqlException e)
connection.Close();
/// &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 int ExecuteSqlTran(List&String& SQLStringList)
using (SqlConnection conn = new SqlConnection(connectionString))
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection =
SqlTransaction tx = conn.BeginTransaction();
cmd.Transaction =
int count = 0;
for (int n = 0; n & SQLStringList.C n++)
string strsql = SQLStringList[n];
if (strsql.Trim().Length & 1)
cmd.CommandText =
count += cmd.ExecuteNonQuery();
tx.Commit();
tx.Rollback();
/// &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 (SqlConnection connection = new SqlConnection(connectionString))
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value =
cmd.Parameters.Add(myParameter);
connection.Open();
int rows = cmd.ExecuteNonQuery();
catch (System.Data.SqlClient.SqlException e)
cmd.Dispose();
connection.Close();
/// &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 object ExecuteSqlGet(string SQLString, string content)
using (SqlConnection connection = new SqlConnection(connectionString))
SqlCommand cmd = new SqlCommand(SQLString, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value =
cmd.Parameters.Add(myParameter);
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
return null;
catch (System.Data.SqlClient.SqlException e)
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 (SqlConnection connection = new SqlConnection(connectionString))
SqlCommand cmd = new SqlCommand(strSQL, connection);
System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
myParameter.Value =
cmd.Parameters.Add(myParameter);
connection.Open();
int rows = cmd.ExecuteNonQuery();
catch (System.Data.SqlClient.SqlException e)
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 (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
return null;
catch (System.Data.SqlClient.SqlException e)
connection.Close();
public static object GetSingle(string SQLString, int Times)
using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
connection.Open();
cmd.CommandTimeout = T
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
return null;
catch (System.Data.SqlClient.SqlException e)
connection.Close();
/// &summary&
/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// &/summary&
/// &param name="strSQL"&查询语句&/param&
/// &returns&SqlDataReader&/returns&
public static SqlDataReader ExecuteReader(string strSQL)
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(strSQL, connection);
connection.Open();
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
return myR
catch (System.Data.SqlClient.SqlException e)
/// &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 (SqlConnection connection = new SqlConnection(connectionString))
DataSet ds = new DataSet();
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
catch (System.Data.SqlClient.SqlException ex)
throw new Exception(ex.Message);
public static DataSet Query(string SQLString, int Times)
using (SqlConnection connection = new SqlConnection(connectionString))
DataSet ds = new DataSet();
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout = T
command.Fill(ds, "ds");
catch (System.Data.SqlClient.SqlException ex)
throw new Exception(ex.Message);
#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 SqlParameter[] cmdParms)
using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand())
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
catch (System.Data.SqlClient.SqlException e)
/// &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SqlParameter[]）&/param&
public static void ExecuteSqlTran(Hashtable SQLStringList)
using (SqlConnection conn = new SqlConnection(connectionString))
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
SqlCommand cmd = new SqlCommand();
foreach (DictionaryEntry myDE in SQLStringList)
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.V
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
trans.Rollback();
/// &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SqlParameter[]）&/param&
public static int ExecuteSqlTran(System.Collections.Generic.List&CommandInfo& cmdList)
using (SqlConnection conn = new SqlConnection(connectionString))
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
SqlCommand cmd = new SqlCommand();
int count = 0;
foreach (CommandInfo myDE in cmdList)
string cmdText = myDE.CommandT
SqlParameter[] cmdParms = (SqlParameter[])myDE.P
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
trans.Rollback();
object obj = cmd.ExecuteScalar();
bool isHave = false;
if (obj == null && obj == DBNull.Value)
isHave = false;
isHave = Convert.ToInt32(obj) & 0;
if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
trans.Rollback();
if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
trans.Rollback();
int val = cmd.ExecuteNonQuery();
if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
trans.Rollback();
cmd.Parameters.Clear();
trans.Commit();
trans.Rollback();
/// &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SqlParameter[]）&/param&
public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List&CommandInfo& SQLStringList)
using (SqlConnection conn = new SqlConnection(connectionString))
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
SqlCommand cmd = new SqlCommand();
int indentity = 0;
foreach (CommandInfo myDE in SQLStringList)
string cmdText = myDE.CommandT
SqlParameter[] cmdParms = (SqlParameter[])myDE.P
foreach (SqlParameter q in cmdParms)
if (q.Direction == ParameterDirection.InputOutput)
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (SqlParameter q in cmdParms)
if (q.Direction == ParameterDirection.Output)
indentity = Convert.ToInt32(q.Value);
cmd.Parameters.Clear();
trans.Commit();
trans.Rollback();
/// &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SqlParameter[]）&/param&
public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
using (SqlConnection conn = new SqlConnection(connectionString))
conn.Open();
using (SqlTransaction trans = conn.BeginTransaction())
SqlCommand cmd = new SqlCommand();
int indentity = 0;
foreach (DictionaryEntry myDE in SQLStringList)
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.V
foreach (SqlParameter q in cmdParms)
if (q.Direction == ParameterDirection.InputOutput)
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
foreach (SqlParameter q in cmdParms)
if (q.Direction == ParameterDirection.Output)
indentity = Convert.ToInt32(q.Value);
cmd.Parameters.Clear();
trans.Commit();
trans.Rollback();
/// &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, params SqlParameter[] cmdParms)
using (SqlConnection connection = new SqlConnection(connectionString))
using (SqlCommand cmd = new SqlCommand())
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;
catch (Exception e)
Console.WriteLine(e.Message);
return null;
/// &summary&
/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// &/summary&
/// &param name="strSQL"&查询语句&/param&
/// &returns&SqlDataReader&/returns&
public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return myR
catch (System.Data.SqlClient.SqlException e)
cmd.Dispose();
connection.Close();
/// &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 SqlParameter[] cmdParms)
using (SqlConnection connection = new SqlConnection(connectionString))
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
DataSet ds = new DataSet();
da.Fill(ds, "ds");
cmd.Parameters.Clear();
catch (System.Data.SqlClient.SqlException ex)
throw new Exception(ex.Message);
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection =
cmd.CommandText = cmdT
if (trans != null)
cmd.Transaction =
cmd.CommandType = CommandType.T//cmdT
if (cmdParms != null)
foreach (SqlParameter parameter in cmdParms)
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
parameter.Value = DBNull.V
cmd.Parameters.Add(parameter);
#endregion
#region 存储过程操作
/// &summary&
/// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
/// &/summary&
/// &param name="storedProcName"&存储过程名&/param&
/// &param name="parameters"&存储过程参数&/param&
/// &returns&SqlDataReader&/returns&
public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
SqlConnection connection = new SqlConnection(connectionString);
SqlDataReader returnR
connection.Open();
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredP
returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
return returnR
/// &summary&
/// 执行存储过程
/// &/summary&
/// &param name="storedProcName"&存储过程名&/param&
/// &param name="parameters"&存储过程参数&/param&
/// &param name="tableName"&DataSet结果中的表名&/param&
/// &returns&DataSet&/returns&
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
using (SqlConnection connection = new SqlConnection(connectionString))
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataS
public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
using (SqlConnection connection = new SqlConnection(connectionString))
DataSet dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.SelectCommand.CommandTimeout = T
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataS
/// &summary&
/// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
/// &/summary&
/// &param name="connection"&数据库连接&/param&
/// &param name="storedProcName"&存储过程名&/param&
/// &param name="parameters"&存储过程参数&/param&
/// &returns&SqlCommand&/returns&
private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
SqlCommand command = new SqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredP
foreach (SqlParameter parameter in parameters)
if (parameter != null)
// 检查未分配值的输出参数,将其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
parameter.Value = DBNull.V
command.Parameters.Add(parameter);
/// &summary&
/// 执行存储过程，返回影响的行数
/// &/summary&
/// &param name="storedProcName"&存储过程名&/param&
/// &param name="parameters"&存储过程参数&/param&
/// &param name="rowsAffected"&影响的行数&/param&
/// &returns&&/returns&
public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
using (SqlConnection connection = new SqlConnection(connectionString))
connection.Open();
SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
rowsAffected = command.ExecuteNonQuery();
result = (int)command.Parameters["ReturnValue"].V
//Connection.Close();
/// &summary&
/// 创建 SqlCommand 对象实例(用来返回一个整数值)
/// &/summary&
/// &param name="storedProcName"&存储过程名&/param&
/// &param name="parameters"&存储过程参数&/param&
/// &returns&SqlCommand 对象实例&/returns&
private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new SqlParameter("ReturnValue",
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
#endregion
CommandInfo.cs代码：
using System.Collections.G
using System.T
using System.Data.SqlC
namespace MTBug.sqlHelper
public enum EffentNextType
/// &summary&
/// 对其他语句无任何影响
/// &/summary&
/// &summary&
/// 当前语句必须为"select count(1) from .."格式，如果存在则继续执行，不存在回滚事务
/// &/summary&
WhenHaveContine,
/// &summary&
/// 当前语句必须为"select count(1) from .."格式，如果不存在则继续执行，存在回滚事务
/// &/summary&
WhenNoHaveContine,
/// &summary&
/// 当前语句影响到的行数必须大于0，否则回滚事务
/// &/summary&
ExcuteEffectRows,
/// &summary&
/// 引发事件-当前语句必须为"select count(1) from .."格式，如果不存在则继续执行，存在回滚事务
/// &/summary&
SolicitationEvent
public class CommandInfo
public object ShareObject = null;
public object OriginalData = null;
event EventHandler _solicitationE
public event EventHandler SolicitationEvent
_solicitationEvent +=
_solicitationEvent -=
public void OnSolicitationEvent()
if (_solicitationEvent != null)
_solicitationEvent(this, new EventArgs());
public string CommandT
public System.Data.Common.DbParameter[] P
public EffentNextType EffentNextType = EffentNextType.N
public CommandInfo()
public CommandInfo(string sqlText, SqlParameter[] para)
this.CommandText = sqlT
this.Parameters =
public CommandInfo(string sqlText, SqlParameter[] para, EffentNextType type)
this.CommandText = sqlT
this.Parameters =
this.EffentNextType =
myHelper.cs代码：
using System.Collections.G
using System.L
using System.T
using System.X
using System.IO;
namespace MTBug
public static class myHelper
public delegate void ShowWarnMessage(string _str);
public static event ShowWarnMessage showWarnM
public static string xmlPath = System.Environment.CurrentDirectory + "\\Resources\\Config.xml";
public static void mySendMessageToMainWindow(string _str)
if (showWarnMessage != null)
showWarnMessage(_str);
public static string getXMLValue(string eleName)
XmlDocument xmlDoc1 = new XmlDocument();
xmlDoc1.Load(xmlPath);
var root = xmlDoc1.DocumentE
XmlNode nodes = xmlDoc1.SelectSingleNode("//" + eleName);
if (nodes != null)
xmlDoc1.Save(xmlPath);
return nodes.InnerText.ToString();
XmlElement xe1 = xmlDoc1.CreateElement(eleName);//创建一个&hospitalName&节点
xe1.InnerText = "";
root.AppendChild(xe1);
xmlDoc1.Save(xmlPath);
return "";
catch (Exception tt)
myHelper.errorLogAdd(tt.Message);
return "";
public static void errorLogAdd(string _str)
_str = DateTime.Now.ToString("yyyyMMddhhmmss") + "-" + _
if (System.IO.File.Exists("C://errorLog.txt"))
StreamWriter sw = new StreamWriter("C://errorLog.txt", true, Encoding.GetEncoding("gb2312"));
sw.WriteLine(_str);
sw.Flush();
sw.Close();
FileStream fs1 = new FileStream("C://errorLog.txt", FileMode.Create, FileAccess.Write);//创建
StreamWriter sw = new StreamWriter(fs1);
sw.WriteLine(_str);
sw.Flush();
sw.Close();
fs1.Close();
完成以上步骤之后，在MainWindow.xaml中添加增、删、改三个按钮：
&Canvas x:Name="c_sql" Width="500" Height="150" Canvas.Left="50" Canvas.Top="800" Background="SkyBlue"&
&Label x:Name="label1" Height="30" Width="120" Content="数据库SQL更改" FontFamily="Berlin Sans FB" FontSize="16"/&
&Button Canvas.Left="50" Canvas.Top="50" Content="添加" Height="60" Name="button1" Width="100" Click="button1_Click" FontSize="20"/&
&Button Canvas.Left="200" Canvas.Top="50" Content="删除" Height="60" Name="button2" Width="100" Click="button2_Click" FontSize="20"/&
&Button Canvas.Left="350" Canvas.Top="50" Content="更新" Height="60" Name="button3" Width="100" Click="button3_Click" FontSize="20"/&
项目中新建一个类test.cs，代码如下：
using System.Collections.G
using System.L
using System.T
using System.Data.SqlC
using System.D
namespace MTBug.sqlHelper
[Serializable]
public partial class test
public test()
#region Model
private int _
private string _
public int ids
set{ _ids =}
get{ return _}
public string name
set{ _name =}
get{ return _}
#endregion Model
#region Model
/// &summary&
/// 增加一条数据
/// &/summary&
public int Add(int ids, string username)
////string _str = "insert into [test] (ids,name) values (" + ids.ToString() + "," + "'"+username.ToString()+"'" + ");";
StringBuilder strSql = new StringBuilder();
strSql.Append("insert into [test] (");
strSql.Append(" ids,name) ");
strSql.Append(" values (");
strSql.Append(" @ids,@name)");
SqlParameter[] parameters = {
new SqlParameter("@ids", SqlDbType.Int,4),
new SqlParameter("@name", SqlDbType.VarChar,20)};
parameters[0].Value =
parameters[1].Value =
//StringBuilder strSql = new StringBuilder();
//strSql.Append("insert into [test] (");
//strSql.Append(" ids,name) values ( ");
//strSql.Append("@ids,@name)");
//SqlParameter[] parameters = {
new SqlParameter("@ids", SqlDbType.Int,4),
new SqlParameter("@name", SqlDbType.VarChar,20)};
//parameters[0].Value =
//parameters[1].Value =
object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters);
if (obj == null)
return Convert.ToInt32(obj);
/// &summary&
/// 删除一条数据
/// &/summary&
public bool Delete(int ids)
StringBuilder strSql = new StringBuilder();
strSql.Append("delete from [test] ");
strSql.Append(" where ids=" + ids.ToString());
int rows = DbHelperSQL.ExecuteSql(strSql.ToString());
if (rows & 0)
return true;
return false;
/// &summary&
/// 更新一条数据
/// &/summary&
public bool Update(int ids, string username)
StringBuilder strSql = new StringBuilder();
strSql.Append("update [test] set ");
strSql.Append("name=@name ");
strSql.Append(" where ids=@ids ");
SqlParameter[] parameters = {
new SqlParameter("@ids", SqlDbType.Int,4),
new SqlParameter("@name", SqlDbType.VarChar,50)};
parameters[0].Value =
parameters[1].Value =
int rows = DbHelperSQL.ExecuteSql(strSql.ToString(), parameters);
if (rows & 0)
return true;
return false;
#endregion
test代码中定义如何对数据库进行增删改数据的方法。
最后，在MainWindow.xaml.cs后台代码中设置，三个按钮的点击事件：
private void button1_Click(object sender, RoutedEventArgs e)
///点击往test表里随机插入一条数据
test _u = new test();
int _ds = _u.Add(2, "你好");
private void button2_Click(object sender, RoutedEventArgs e)
test _u = new test();
bool _ds = _u.Delete(2);
private void button3_Click(object sender, RoutedEventArgs e)
test _u = new test();
bool _ds = _u.Update(2, "欧文");
查看数据库的表test，数据就可以增删改了。
&===================================================
出错地点总结：
①增删改数据库的方法类型要与相对应的方法类型一致：
②传递的参数要对应：
③编写sql语句要正确，尤其字符串要加上，单引号&&。
例：insert into [MTBugList].[dbo].[test] (ids,name) values (3,'你好');&
④有两种C#sql语句的写法：
/// &summary&
/// 增加一条数据
/// &/summary&
public int Add(int ids, string username)
string _str = "insert into [test] (ids,name) values (" + ids.ToString() + "," + "'" + username.ToString() + "'" + ");";
object obj = DbHelperSQL.GetSingle(_str.ToString());
if (obj == null)
return Convert.ToInt32(obj);
/// &summary&
/// 增加一条数据
/// &/summary&
public int Add(int ids, string username)
StringBuilder strSql = new StringBuilder();
strSql.Append("insert into [test] (");
strSql.Append(" ids,name) ");
strSql.Append(" values (");
strSql.Append(" @ids,@name)");
SqlParameter[] parameters = {
new SqlParameter("@ids", SqlDbType.Int,4),
new SqlParameter("@name", SqlDbType.VarChar,20)};
parameters[0].Value =
parameters[1].Value =
object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters);
if (obj == null)
return Convert.ToInt32(obj);
⑤注意④中含多个字段时，parameters[？].Value要随着更改。
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