insertion

Can the South (for Django) insert rows of data into database?

由 瘦欲@ 提交于 2019-12-11 05:53:02
问题 I want to create a table, and then a list of data that should be inserted into that table. Does South have the capability to do such a thing? If so, do you have any reference as to show me how this can be done? I want to be able to do this because at this point, it seems like the only way to have the 'exact' same data is to manually insert them into the database ourselves. I want some 'nice' automated way of inserting rows in a table. 回答1: You'd want to use fixtures. Create a fixtures

Mysql InnoDB Insertion Speed Too Slow?

由 廉价感情. 提交于 2019-12-10 11:18:02
问题 I have a InnoDb table in Mysql that needs to handle insertions very quickly (everything else can be as slow as it wants). The table has no relations or indexes an id which is auto incremented and a time stamp. I ran a script from multiple clients to insert as many records as possible in the allotted time (loop insert) and calculated the number of insertions per second. I am only getting on average 200 insertions per second and I need around 20000. The performance doesn't change with the

SQL Server error: ExecuteNonQuery: Connection property has not been initialized

由 淺唱寂寞╮ 提交于 2019-12-09 04:38:41
I am trying to develop a sample registration page using ASP.Net and C#. I am calling a stored procedure to insert the data to database. My database is SQL Server 2008. This is my code: public partial class Sample : System.Web.UI.Page { SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ToString()); string str; protected void Page_Load(object sender, EventArgs e) { rbt_Male.Checked = true; } protected void btn_Submit_Click(object sender, EventArgs e) { string @Name = txtbx_Name.Text; string @Gender_male = rbt_Male.Text; string @Gender_Female = rbt

Selecting a Random Row in Oracle

由 拥有回忆 提交于 2019-12-07 08:44:42
问题 I need to randomly select values from one table, e.g. tableA.a_id which is a VARCHAR2 , and use the value to insert into another table. For instance, assuming three columns needs to be inserted into 100 rows of tableX (a sequence number, a random number between 100 and 999, and values of tableA.a_id ): insert into tableX select rownum, dbms_random.value(100,999), 0), (select a_id from ( SELECT a_id FROM tableA ORDER BY dbms_random.value ) where rownum = 1) from (select level from dual connect

Codeigniter, error tracking in transaction

由 安稳与你 提交于 2019-12-07 06:10:48
问题 I'm running a little method in CodeIgniter to insert some lines in the database (same table). I would like to see which insertion have failed inside a transaction (by returning an array of titles). My code is : $failure = array(); //the array where we store what failed $this->db->trans_start(); foreach ($data as $ressourceCsv){ //data is an array of arrays to feed the database $this->ajout_ressource($ressourceCsv); //method to insert (basically, just an insert with active record) if (($this-

Insertion sort analysis and summation notation

由 随声附和 提交于 2019-12-06 05:30:03
问题 I am trying to understand the worst case analysis of Insertion sort and I have a problem with the math involved on slide 21 (ppt). I understand the first formula: But these I'm struggling with: Why is there a - 1 at the end? Also, I don't understand this one: 回答1: It's Gauss' trick to sum numbers from 1 to n: First formula However, the sum you want to compute starts at 2 , not 1 , that is why you have to subtract the first term (i.e. 1) from the formula: Second formula Essentially, you

MVC Ajax.BeginForm Replace strange behaviour

由 て烟熏妆下的殇ゞ 提交于 2019-12-06 00:09:40
问题 In a partial view, I am using MVCs Ajax.Beginform like followed: <div id="divToReplace"> @using (Ajax.BeginForm("Action", "Controller, new AjaxOptions { InsertionMode = System.Web.Mvc.Ajax.InsertionMode.Replace, UpdateTargetId = "divToReplace" }, new { id = "formID" })) { ... </div> When submitting the form, I would expect that the hole div "divToReplace" is replaced by the answer (the partial view again). But instead the inner html of the div "divToReplace" is replaced by the answer, so the

Selecting a Random Row in Oracle

由 不问归期 提交于 2019-12-05 14:10:13
I need to randomly select values from one table, e.g. tableA.a_id which is a VARCHAR2 , and use the value to insert into another table. For instance, assuming three columns needs to be inserted into 100 rows of tableX (a sequence number, a random number between 100 and 999, and values of tableA.a_id ): insert into tableX select rownum, dbms_random.value(100,999), 0), (select a_id from ( SELECT a_id FROM tableA ORDER BY dbms_random.value ) where rownum = 1) from (select level from dual connect by level <= 100); However, rather than picking a random row from tableA.a_id for each row, it selects

MVC Ajax.BeginForm Replace strange behaviour

由 与世无争的帅哥 提交于 2019-12-04 05:02:01
In a partial view, I am using MVCs Ajax.Beginform like followed: <div id="divToReplace"> @using (Ajax.BeginForm("Action", "Controller, new AjaxOptions { InsertionMode = System.Web.Mvc.Ajax.InsertionMode.Replace, UpdateTargetId = "divToReplace" }, new { id = "formID" })) { ... </div> When submitting the form, I would expect that the hole div "divToReplace" is replaced by the answer (the partial view again). But instead the inner html of the div "divToReplace" is replaced by the answer, so the beginning of the partial view looks like this: <div id="divToReplace"> <div id="divToReplace"> ... What

How are iomanip Functions Implemented?

由 浪子不回头ぞ 提交于 2019-12-04 00:49:57
问题 Some of the standard iomanip functions take take a parameter. I'd like to know how this is accomplished, for instance, can I do something similar with a function? That's really the solution that I needed for this answer, but I couldn't figure out how to do this. When I looked up the definition for setw function for example in http://en.cppreference.com it lists the return type as "unspecified", and it also only lists one argument, rather than also taking a stream& parameter. How does this
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