[Asp.Net]自己的一个SqlHelper类
using System;
using System.Configuration;//
using System.Data;//
using System.Data.SqlClient;//
public class SqlHelper
{
private SqlConnection conn = null;
private SqlCommand cmd = null;
private SqlDataReader sdr = null;
public SqlHelper()
{
/*
* 先引用组件：System.configuration
* 再using System.Configuration
* 修改节点：<connectionStrings><add name="connStr" connectionString="数据库连接字符串"/></connectionStrings>
*/
string connstr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
conn = new SqlConnection(connstr);
}
public bool ss()
{
if (conn.State==ConnectionState.Open)
{
return true;
}
else
{
return false;
}
}
//打开conn
private SqlConnection GetConn()
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
return conn;
}
/// <summary>
/// 该方法执行传入增删改SQL语句，返回受影响行数
/// </summary>
/// <param name="sql">增删改SQL语句</param>
/// <returns>返回受影响行数</returns>
public int ExecuteNonQuery(String sql)
{
int res;
try
{
SqlCommand cmd = new SqlCommand(sql, GetConn());
res = cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
return res;
}
/// <summary>
/// 该方法执行传入增删改SQL语句，返回受影响行数(+1)
/// </summary>
/// <param name="cmdText">增删改SQL语句</param>
/// <returns></returns>
public int ExecuteNonQuery(string cmdText, SqlParameter[] paras)
{
int res;
using (cmd = new SqlCommand(cmdText, GetConn()))
{
cmd.Parameters.AddRange(paras);
res = cmd.ExecuteNonQuery();
}
return res;
}
/// <summary>
/// 该方法执行传入的Sql查询语句
/// </summary>
/// <param name="sql">要执行的Sql查询语句</param>
/// <returns>返回DataTable</returns>
public DataTable ExecuteQuery(string sql)
{
DataTable dt = new DataTable();
cmd = new SqlCommand(sql, GetConn());
using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
return dt;
}
}
下面是使用！！
使用
using
System;
using
System.Collections.Generic;
using
System.Text;
using
System.Data;
//
using
System.Data.SqlClient;
//
public
class
TestQuestions
{
private
SqlHelper s
=
null
;
public
TestQuestions()
{
s
=
new
SqlHelper();
}
///
<summary>
///
插入题目
///
</summary>
///
<param name="questionsclass">
问题分类
</param>
///
<param name="quesstions">
问题题目
</param>
///
<param name="answer1">
答案1（正确答案）
</param>
///
<param name="answer2">
答案2
</param>
///
<param name="answer3">
答案3
</param>
///
<param name="answer4">
答案4
</param>
///
<returns></returns>
public
bool
Insert(
string
questionsclass,
string
questions,
string
answer1,
string
answer2,
string
answer3,
string
answer4)
{
bool
flag
=
false
;
string
sql
=
@"
insert into t_testquestions values(@questionsclass,@questions,@answer1,@answer2,@answer3,@answer4)
"
;
SqlParameter[] paras
=
new
SqlParameter[] {
new
SqlParameter(
"
@questionsclass
"
, questionsclass),
new
SqlParameter(
"
@questions
"
, questions),
new
SqlParameter(
"
@answer1
"
, answer1),
new
SqlParameter(
"
@answer2
"
, answer2),
new
SqlParameter(
"
@answer3
"
, answer3),
new
SqlParameter(
"
@answer4
"
, answer4)
};
int
res
=
s.ExecuteNonQuery(sql, paras);
if
(res
>
0
)
{
flag
=
true
;
}
return
flag;
}
///
<summary>
///
该方法取出所有题目（按题目分类排序）
///
</summary>
///
<param name="classid">
题库id
</param>
///
<returns>
返回DataTable
</returns>
public
DataTable SelectAll_test(
string
classid)
{
string
sql
=
@"
select * from t_testquestions where questionsclassid=
"
+
classid;
DataTable dt
=
s.ExecuteQuery(sql);
return
dt;
}
///
<summary>
///
该方法删除一条题目
///
</summary>
///
<param name="id">
题目的id
</param>
///
<returns></returns>
public
bool
Delete(
string
id)
{
bool
flag
=
false
;
string
sql
=
@"
delete t_testquestions where id=@id
"
;
SqlParameter[] paras
=
new
SqlParameter[] {
new
SqlParameter(
"
@id
"
, id)
};
int
res
=
s.ExecuteNonQuery(sql, paras);
if
(res
>
0
)
{
flag
=
true
;
}
return
flag;
}
///
<summary>
///
该方法更新指定id的题目
///
</summary>
///
<param name="id">
题目的id
</param>
///
<param name="questionsclass">
问题分类
</param>
///
<param name="quesstions">
问题题目
</param>
///
<param name="answer1">
答案1（正确答案）
</param>
///
<param name="answer2">
答案2
</param>
///
<param name="answer3">
答案3
</param>
///
<param name="answer4">
答案4
</param>
///
<returns>
成功返回真
</returns>
public
bool
update(
string
id,
string
questionsclass,
string
questions,
string
answer1,
string
answer2,
string
answer3,
string
answer4)
{
bool
flag
=
false
;
string
sql
=
@"
update t_testquestions set [questionsclass]=@questionsclass,[questions]=@questions,[answer1]=@answer1,[answer2]=@answer2,[answer3]=@answer3,[answer4]=@answer4 where id=@id
"
;
SqlParameter[] paras
=
new
SqlParameter[] {
new
SqlParameter(
"
@id
"
, id),
new
SqlParameter(
"
@questionsclass
"
, questionsclass),
new
SqlParameter(
"
@questions
"
, questions),
new
SqlParameter(
"
@answer1
"
, answer1),
new
SqlParameter(
"
@answer2
"
, answer2),
new
SqlParameter(
"
@answer3
"
, answer3),
new
SqlParameter(
"
@answer4
"
, answer4)
};
int
res
=
s.ExecuteNonQuery(sql, paras);
if
(res
>
0
)
{
flag
=
true
;
}
return
flag;
}
public
string
idToQuestions(
string
id)
{
string
sql
=
@"
select * from t_testquestions where id=
"
+
id;
DataTable dt
=
s.ExecuteQuery(sql);
return
dt.Rows[
0
][
2
].ToString();
}
//
---类别管理
///
<summary>
///
该方法取出所有题库分类
///
</summary>
///
<returns>
返回DataTable
</returns>
public
DataTable SelectAll_class()
{
string
sql
=
@"
select * from t_questionsclass
"
;
DataTable dt
=
s.ExecuteQuery(sql);
return
dt;
}
///
<summary>
///
刚方法添加题库
///
</summary>
///
<param name="name">
题库名
</param>
///
<returns>
成功返回真
</returns>
public
bool
Insert_Class(
string
name)
{
bool
flag
=
false
;
if
(
!
IsExists_class(name))
{
string
sql
=
@"
insert into t_questionsclass values('
"
+
name
+
"
')
"
;
int
res
=
s.ExecuteNonQuery(sql);
if
(res
>
0
)
{
flag
=
true
;
}
}
return
flag;
}
///
<summary>
///
该方法删除一个题库
///
</summary>
///
<param name="id">
题库id
</param>
///
<returns></returns>
public
bool
Delete_class(
string
id)
{
bool
flag
=
false
;
string
sql
=
@"
delete t_questionsclass where id=@id
"
;
SqlParameter[] paras
=
new
SqlParameter[] {
new
SqlParameter(
"
@id
"
, id)
};
int
res
=
s.ExecuteNonQuery(sql, paras);
if
(res
>
0
)
{
flag
=
true
;
}
return
flag;
}
///
<summary>
///
该方法判断传入题库名是否存在
///
</summary>
///
<param name="name">
题库名
</param>
///
<returns>
存在返回true，不存在返回false
</returns>
public
bool
IsExists_class(
string
name)
{
bool
flag
=
false
;
string
sql
=
"
select * from t_questionsclass where [classname]='
"
+
name
+
"
'
"
;
DataTable dt
=
s.ExecuteQuery(sql);
if
(dt.Rows.Count
>
0
)
{
flag
=
true
;
}
return
flag;
}
}