使用SqlDataReader将值插入到SQL Server表中

Question

这是我编写select语句来检查数据库中是否有值的方法。

bool userIsPresent=false; 
string sqlQuery = string.Format("SELECT * FROM Person WHERE Name = '{0}'", name); 

SqlCommand s = new SqlCommand(sqlQuery, con); 
con.Open(); 

SqlDataReader sqlread = s.ExecuteReader(); 
userIsPresent = sqlread.HasRows; 
con.Close(); 

但现在我需要一些值保存到数据库中。我怎样才能做到这一点 ？我不认为我应该使用SqlDataReader，那么如何保存并确认数据是否保存到数据库？

public static bool saveToDb(string name1,string nam2, DateTime dat) 
{ 
    bool ok=false; 
    string sqlQuery = string.Format("INSERT into NumbersTable values ('{0}', '{1}','{2}')",name1,nam2,dat); 

    SqlCommand s = new SqlCommand(sqlQuery, con); 

    con.Open(); 
    SqlDataReader sr = s.ExecuteReader(); // MIGHT BE WRONG 
    ok = sr.HasRows; 

    con.Close(); 
    return ok; 
} 

Answer 1

您需要ExecuteNonQuery在数据库中插入记录。

s.ExecuteNonQuery(); 

（使用Parameterized query防止SQL注入）

Answer 2

在代码中添加此：

con.open(); 
S.executeNonQuery(); 

Answer 3

只需要更正您现有的代码中的一些事情，无疑这会有所帮助对你来说：

public static bool executeMyQuery(string sqlQuery) 
     { 
     try 
     {  con.Open(); 
       SqlCommand s = new SqlCommand(sqlQuery, con); 
       s.ExecuteNonQuery(); 
       con.Close(); 
       return true; 
     } 
     catch() 
     { 
      return false; 
     } 

    And use the above function[executeMyQuery()] anywhere you want to insert like and check whether record is inserted or not like below: 

    bool isInserted = false; 
    // give dummy value or get it what u want to inser on name1,nam2,dat 
    string rawQuery = string.Format("INSERT into NumbersTable values ('{0}', '{1}','{2}')",name1,nam2,dat); 

    isInserted = myExecuteQuery(rawQuery); 

    if(isInserted) 
    { 
     // lblStatus i am taking only to make you understand 
     // lblStatus.text = "Record inserted succesfully"; 
    } 
    else 
    { 
     // lblStatus.text = "Record insertion failed"; 
    } 

Answer 4

好吧所以y ou想要做的是插入到数据库中，而不是从中读取数据，因此您只需简单地对数据库执行sql查询，而不读取从数据库中选择的任何数据。为此，您需要使用ExecuteNonQuery语句而不是sqlDataReader。结果会看起来像这样

public static bool saveToDb(string name1, string nam2, DateTime dat) 
{ 
    bool ok = false; 
    string sqlQuery = "INSERT INTO NumbersTable VALUES (@name1, @nam2, @dat)"; 
    //This is the sql query we will use and by placing the @ symbol in front of words 
    //Will establish them as variables and placeholders for information in an sql command 
    //Next we create the sql command 
    SqlCommand cmd = new SqlCommand(sqlQuery, con); 
    //Here we will insert the correct values into the placeholders via the commands 
    //parameters 
    cmd.Parameters.AddWithValue("name1", name1); 
    //This tells it to replace "@name1" with the value of name1 
    cmd.Parameters.AddWithValue("nam2", nam2); 
    cmd.Parameters.AddWithValue("dat", dat); 
    //Finally we open the connection 
    con.Open(); 
    //Lastly we tell the sql command to execute on the database, in this case inserting 
    //the values 
    int i = cmd.ExecuteNonQuery(); 
    //Here we have the results of the execution stored in an integer, this is because 
    //ExecuteNonQuery returns the number of rows it has effected, in the case of this 
    //Insert statement it would effect one row by creating it, therefore i is 1 
    //This is useful for determining if your sql statement was successfully executed 
    //As if it returns 0, nothing has happened and something has gone wrong 
    con.Close(); 
} 

我希望这有助于，如果您需要其他任何东西随时问。

Answer 5

试试吧...这个代码将得到正确的消息..
1，名称2，DAT是列名在数据表中数据库

公共静态无效saveToDb（）
{
string sqlQuery =“INSERT到NumbersTable（name1，name2，dat）values（'Princee'，'Singhal'，'18/02/2012'）;
SqlCommand s = new SqlCommand（sqlQuery，con）;
con .Open（）;
int i = s.Execut eNonQuery（）; （i> = 1）
如果（i> = 1）
{
MessageBox.Show（“Record Inserted”）;
}
其他
{
MessageBox.Show（ “可能会出现一些问题Occure！”）;
}
con.Close（）;
}