增加了个文本框后SQL语句抛出没有默认只异常问题
数据库文件增加了个solutionContent字段，改了想向数据库写入数据的C#代码和相应的SQL语句（其他查询及修改的代码还没有增加新字段），结果在操作数据库的代码中抛出异常！/// <summary>
///WorkLog 的摘要说明
/// </summary>
public class WorkLog
{
string sql = string.Empty;
public WorkLog()
{
}
public WorkLog(DataRow dr)
{
_logID = Convert.ToInt32(dr["ID"]);
_userID = Convert.ToInt32(dr["userID"]);
_caID = Convert.ToInt32(dr["caID"]);
_logContent = dr["logContent"].ToString();
_solutionContent = dr["solutionContent"].ToString();
_addDate = Convert.ToDateTime(dr["addDate"]);
_title = dr["logTitle"].ToString();
}
/// <summary>
/// 日志编号
/// </summary>
private int _logID;
public int LogID
{
get { return _logID; }
set { _logID = value; }
}
/// <summary>
/// 用户编号
/// </summary>
private int _userID;
public int UserID
{
get { return _userID; }
set { _userID = value; }
}
/// <summary>
/// 分类编号（日记类型）
/// </summary>
private int _caID;
public int CaID
{
get { return _caID; }
set { _caID = value; }
}
/// <summary>文章标题
///
/// </summary>
private string _title;
public string Title
{
get { return _title; }
set { _title = value; }
}
/// <summary>
/// 问题描述
/// </summary>
private string _logContent;
public string LogContent
{
get { return _logContent; }
set { _logContent = value; }
}
/// <summary>
/// 解决方案
/// </summary>
private string _solutionContent;
public string SolutionContent
{
get { return _solutionContent; }
set { _solutionContent = value; }
}
/// <summary>
/// 时间
/// </summary>
private DateTime _addDate;
public DateTime AddDate
{
get { return _addDate; }
set { _addDate = value; }
}
/// <summary>添加日志
///
/// </summary>
/// <param name="log"></param>
/// <returns></returns>
public bool Add(WorkLog log)
{
sql = "INSERT INTO WORKLOG (userID,caID,addDate,logTitle,logContent,solutionContent) VALUES(@userID,@caID,@addDate,@title,@logContent,@solutionContent)";
OleDbParameter[] paras = new OleDbParameter[] {
new OleDbParameter("@userID",log.UserID),
new OleDbParameter("@caID",log.CaID),
new OleDbParameter("@addDate",log.AddDate.ToString()),
new OleDbParameter("@title",log.Title),
new OleDbParameter("@logContent",log.LogContent),
new OleDbParameter("@solutionContent",log.SolutionContent)
};
int res = SQLHelper.ExecuteSql(sql, paras);
if (res > 0) return true;
return false;
} --------------------编程问答-------------------- 结果在下面的代码抛出异常：
/// <summary>
///SQLHelper 的摘要说明
/// </summary>
public class SQLHelper
{
public SQLHelper()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
//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.
//todo:数据库连接字符串
public static string connectionString = GetConnString();
public static string GetConnString()
{
string DatabaseName = ConfigurationManager.AppSettings["conStr"];
string DBName = ConfigurationManager.AppSettings["DBName"];
return DatabaseName + System.Web.HttpContext.Current.Server.MapPath(DBName);
}
#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 (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException E)
{
connection.Close();
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 (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
OleDbTransaction 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.OleDb.OleDbException 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 (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand cmd = new OleDbCommand(SQLString, connection);
System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@content", OleDbType.VarChar);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException 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 (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand cmd = new OleDbCommand(strSQL, connection);
System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@fs", OleDbType.Binary);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException 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 (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.OleDb.OleDbException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
}
}
/// <summary>
/// 执行查询语句，返回OleDbDataReader
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>OleDbDataReader</returns>
public static OleDbDataReader ExecuteReader(string strSQL)
{
OleDbConnection connection = new OleDbConnection(connectionString);
OleDbCommand cmd = new OleDbCommand(strSQL, connection);
try
{
connection.Open();
OleDbDataReader myReader = cmd.ExecuteReader();
return myReader;
}
catch (System.Data.OleDb.OleDbException 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 (OleDbConnection connection = new OleDbConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (System.Data.OleDb.OleDbException 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 OleDbParameter[] cmdParms)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (System.Data.OleDb.OleDbException ex)
{
throw new Exception(ex.Message);在此处抛出异常，提示参数 @solutionContent 没有默认值。改在哪赋默认值呢？？
}
}
}
}
--------------------编程问答-------------------- 1、access 数据库 表设计视图
2、 鼠标单击 access 数据库 solutionContent 字段
最下方 有 默认值设置 --------------------编程问答--------------------
这个视图设计的默认值设置没有关系吧！我只是增加了一个填写对于问题的解决方案的内容而已，其字段属性跟问题描述（LogContent）的属性一样的！问题描述数据库视图设计的字段没有默认值的！
还是在代码声明中的问题多点！
补充：.NET技术 , ASP.NET
