prepared-statement

问题 I am use nodejs npm package sql I currently have an array of product skus like so.. var skus = ['product1', 'product2', 'product3']; My sql store in a file as follows... SELECT * FROM stock AS s WHERE s.sku IN (@skus) Then I also have my prepared statement code as follows.. var connection = new sql.Connection(config, function(err) { var ps = new sql.PreparedStatement(connection); //Add params if(params != undefined){ for(var key in params){ ps.input(key, sql.VarChar(200)); } } ps.prepare

问题 This returns true but it didn't truncate the table: $this->db->query("TRUNCATE TABLE $tablename"); But it works before creating a database connection object for prepared statement. How to fix it? Also, I want to know how to truncate the table using prepared statement. 回答1: NO, A prepared statement would not be a solution because it is not possible to bind the table name. So avoid to use prepared statement for Truncate Table. You cannot bind any SQL litera l but data one. So keywords,

问题 Is it possible to store the result of a prepared table in mysql ? My use case is - : I am creating two variables based on certain conditions of the source table, then fetching the randomized rows, based on this criteria. Since I have 10 of such tables, should I be 1st joining them and then doing this randomization on the "overall" passing/filtering criteria (See also @total below, which is my main criteria, PER table) set @total=(select count(*) from tab_1 where predict_var ="4" or predict

问题 I don't remember ever seeing a way to use prepared statements from the console and somehow don't think running an explain query thought as a prepared statement from the API will get what I want. This is related to this old question of mine. I'm primarily interested in MySQL but would be interested in other DBs as well. 回答1: According to the brief research that I conducted, I don't see a way to get it. Ideally, the real execution plan would be generated once the variables are provided. Lookup

问题 I am using JDBC connection object obtained from hibernate to perform bath update, I am doing this because I need to use the MySql ON DUPLICATE feature. But, when trying to insert I am not able to inset saying the string has special characters, Session session = sessionFactory.openSession(); PreparedStatement pstm = null; Connection conn = session.connection(); try { IRKeyWordTweet record = null; conn.setAutoCommit(false); for (Iterator itrList = statusToInsert.iterator(); itrList.hasNext();)

问题 I am looking for a way to achieve PreparedStatement caching, so as to save recreating the PreparedStatement objects for queries that were already executed in the past. Is there some built in way to achieve this using Tomcat? Or must I program this cache myself? 回答1: I believe tomcat uses commons-dbcp and commons-dbcp supports prepared statement pooling. check it out here. poolPreparedStatements false Enable prepared statement pooling for this pool. 回答2: Prepared statement caching is done by

问题 In PostgreSQL, what is the difference between a prepared statement and a SQL or PL/pgSQL function, in terms of their purposes, advantages and disadvantages? When shall we use which? In this very simple example, do they work the same, correct? CREATE TABLE foo (id INT, name VARCHAR(80)); CREATE FUNCTION myfunc1(INT, VARCHAR(80)) RETURNS void AS ' INSERT INTO foo VALUES ($1, $2); ' LANGUAGE SQL; SELECT myfunc1(3, 'ben'); CREATE FUNCTION myfunc2(INT, VARCHAR(80)) RETURNS void AS ' BEGIN INSERT

问题 I have a table in the database: create table store ( ... n_status integer not null, t_tag varchar(4) t_name varchar, t_description varchar, dt_modified timestamp not null, ... ); In my stored function I need to execute the same select against this table multiple times: select * from store where n_place_id = [different values] and t_tag is not null and n_status > 0 and (t_name ~* t_search or t_description ~* t_search) order by dt_modified desc limit n_max; Here, t_search and n_max are

问题 I'm learning about prepared statements and trying to work with a query that yields multiple rows of results. Right now, I'm just trying to figure out how to determine the number of rows and then make that number display in the html. My prepared statement looks like this: if($stmt = $mysqli -> prepare("SELECT field1, field2, field3 FROM table WHERE id= ?ORDER BY id ASC")) { /* Bind parameters, s - string, b - blob, i - int, etc */ $stmt -> bind_param("i", $id); $stmt -> execute(); /* Bind

问题 I am trying to insert to a timestamp with timezone field of my DB a string which includes date, time and timezone using prepared statement. The problem is that Timestamp.valueof function does not take into consideration the time zone that the string inludes so it causes an error. The accepted format is yyyy-[m]m-[d]d hh:mm:ss[.f...] which does not mention timezone. That is the exact code that causes the error: pst.setTimestamp(2,Timestamp.valueOf("2012-08-24 14:00:00 +02:00")) Is there any