小弟新学,做了个简单的登陆界面,运行时出现错误,请帮忙解决。
protected void Button1_Click(object sender, EventArgs e)
{
if (this.TextBox2.Text != "")
{
if (this.TextBox1.Text != "")
{
string sql;
sql =string.Format( "select * from User where Name='" + this.TextBox2.Text.Trim()+ "' and PassWord='" + this.TextBox1.Text.Trim() + "'");
try
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["巡检系统数据库ConnectionString"].ConnectionString);
conn.Open();
SqlCommand cmd=new SqlCommand(sql,conn);
cmd.Connection = conn;
int state=Convert.ToInt32(cmd.ExecuteScalar());
if(state==0||state>1)
{
this.Label3.Text="用户不存在,请检测用户名和密码是否正确!";
}
else
{
this.Label3.Text="登录成功!";
}
conn.Close();
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
}
else
{
this.Label3.Text = "请输入密码!";
}
}
else
{
this.Label3.Text = "请选择用户!";
}
}
}运行程序,页面可以打开,输入用户名和密码后,点确定,提示如下“/巡检系统”应用程序中的服务器错误。
--------------------------------------------------------------------------------System.Data.SqlClient.SqlException: 关键字 'User' 附近有语法错误。
在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
在 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
在 System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
在 System.Data.SqlClient.SqlDataReader.get_MetaData()
在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
在 System.Data.SqlClient.SqlCommand.ExecuteScalar()
在 Login.Button1_Click(Object sender, EventArgs e) 这个是什么意思呀?
protected void Button1_Click(object sender, EventArgs e)
{
if (this.TextBox2.Text != "")
{
if (this.TextBox1.Text != "")
{
string sql;
sql =string.Format( "select * from User where Name='" + this.TextBox2.Text.Trim()+ "' and PassWord='" + this.TextBox1.Text.Trim() + "'");
try
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["巡检系统数据库ConnectionString"].ConnectionString);
conn.Open();
SqlCommand cmd=new SqlCommand(sql,conn);
cmd.Connection = conn;
int state=Convert.ToInt32(cmd.ExecuteScalar());
if(state==0||state>1)
{
this.Label3.Text="用户不存在,请检测用户名和密码是否正确!";
}
else
{
this.Label3.Text="登录成功!";
}
conn.Close();
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
}
else
{
this.Label3.Text = "请输入密码!";
}
}
else
{
this.Label3.Text = "请选择用户!";
}
}
}运行程序,页面可以打开,输入用户名和密码后,点确定,提示如下“/巡检系统”应用程序中的服务器错误。
--------------------------------------------------------------------------------System.Data.SqlClient.SqlException: 关键字 'User' 附近有语法错误。
在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
在 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
在 System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
在 System.Data.SqlClient.SqlDataReader.get_MetaData()
在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
在 System.Data.SqlClient.SqlCommand.ExecuteScalar()
在 Login.Button1_Click(Object sender, EventArgs e) 这个是什么意思呀?
sql =string.Format( "select * from [User] where Name='" + this.TextBox2.Text.Trim()+ "' and PassWord='" + this.TextBox1.Text.Trim() + "'");试试。
--------------------------------------------------------------------------------System.Data.SqlClient.SqlException: 数据类型 text 和 varchar 在 equal to 运算符中不兼容。
在 System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
在 System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
在 System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
在 System.Data.SqlClient.SqlDataReader.get_MetaData()
在 System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
在 System.Data.SqlClient.SqlCommand.ExecuteScalar()
在 Login.Button1_Click(Object sender, EventArgs e)
sql =string.Format( "select count(*) from [User] where Name='" + this.TextBox2.Text.Trim()+ "' and PassWord='" + this.TextBox1.Text.Trim() + "'");
{
if (this.TextBox2.Text != "")
{
if (this.TextBox1.Text != "")
{
string sql;
sql =string.Format( "select count(*) from [User] where [Name]='" + this.TextBox2.Text.Trim()+ "' and [PassWord]='" + this.TextBox1.Text.Trim() + "'");
try
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["巡检系统数据库ConnectionString"].ConnectionString);
conn.Open();
SqlCommand cmd=new SqlCommand(sql,conn);
cmd.Connection = conn;
int state=Convert.ToInt32(cmd.ExecuteScalar());
if(state==0||state>1)
{
this.Label3.Text="用户不存在,请检测用户名和密码是否正确!";
}
else
{
this.Label3.Text="登录成功!";
}
conn.Close();
}
catch (Exception ex)
{
throw new Exception(ex.ToString());
}
}
else
{
this.Label3.Text = "请输入密码!";
}
}
else
{
this.Label3.Text = "请选择用户!";
}
}
}
sql =string.Format( "select count(*) from [User] where [Name]='{0}' and [PassWord]='{1}'",this.TextBox2.Text.Trim(),this.TextBox1.Text.Trim()+ );
sql =string.Format( "select count(*) from [User] where [Name]='{0}' and [PassWord]='{1}'",this.TextBox2.Text.Trim(),this.TextBox1.Text.Trim());
System.Data.SqlClient.SqlException: 数据类型 text 和 varchar 在 equal to 运算符中不兼容。谁有可用的代码,我想学学呀。新手悲催。。