prepared-statement

问题 the whole data operation is below. i want to close close each and every resource without interfering with the next connection. should i change the constructor to a connection() mthod then have a disconnect() mthod, but after doing so where should i public class DataBean{ private Connection conn = null; private ResultSet res = null; private InitialContext context; private DataSource datasource; private Statement stmt=null; private java.sql.PreparedStatement prepar = null; private java.sql

问题 the whole data operation is below. i want to close close each and every resource without interfering with the next connection. should i change the constructor to a connection() mthod then have a disconnect() mthod, but after doing so where should i public class DataBean{ private Connection conn = null; private ResultSet res = null; private InitialContext context; private DataSource datasource; private Statement stmt=null; private java.sql.PreparedStatement prepar = null; private java.sql

问题 I've two DB servers db1 and db2. db1 has a table called tbl_album db2 has a table called tbl_user_album CREATE TABLE tbl_album ( id PRIMARY KEY, name varchar(128) ... ); CREATE TABLE tbl_user_album ( id PRIMARY KEY, album_id bigint ... ); Now if a user wants to create an album what my php code needs to do is: Create a record in db1 and save its id(primary key) Create a record in db2 using it saved in first statement Is it possible to keep these two statements in a transaction? I'm ok with a

问题 I've two DB servers db1 and db2. db1 has a table called tbl_album db2 has a table called tbl_user_album CREATE TABLE tbl_album ( id PRIMARY KEY, name varchar(128) ... ); CREATE TABLE tbl_user_album ( id PRIMARY KEY, album_id bigint ... ); Now if a user wants to create an album what my php code needs to do is: Create a record in db1 and save its id(primary key) Create a record in db2 using it saved in first statement Is it possible to keep these two statements in a transaction? I'm ok with a

问题 I have a script using PHP and MySQLi with prepared statements. The purpose is to create a new user on a MySQL server, however preparing the statement fails with no further information as to why. $query = 'CREATE USER ?@`10.1.1.%` IDENTIFIED BY ?;'; if ($stmt = $newdb->prepare($query)) { $stmt->bind_param('ss', $db_username, $db_password); if ($stmt->execute()) { // Database user created successfully } else { die(errorJSON('db', 'create', 22)); } $stmt->close(); } else { die(errorJSON('db',

问题 I am trying to create a prepared statement in using the Golang sqlx library. I want to have the table name be a bindVar stmt, err := stmtTx.Preparex("SELECT * FROM $1 WHERE question_id=$2;") However this gives me an syntax error around /$1/ . Can I not use a bind var for the table name? 回答1: Can I not use a bind var for the table name? No, source of quote. The arguments can only be used as data values, not as identifiers. Thus for example this is reasonable: INSERT INTO mytable VALUES ($1);

问题 From this tutorial shown that rows.Closed() must be called where rows is from stmt.Query() , is stmt.Closed() also should be called where stmt is from db.Prepare() ? // inside a function stmt, err := db.Prepare(cmd) // cmd is SQL string Check(err) // should we add: defer stmt.Close() rows, err := stmt.Query(params) // params is map/interface{} defer rows.Close() Check(err) 回答1: The short answer is Yes. You should call stmt.Close(); The long answer can be found in this google groups thread.

问题 I have a query that looks like this: SELECT last_name, first_name, middle_initial FROM names WHERE last_name IN ('smith', 'jones', 'brown') I need to be able to parameterize the list in the IN clause to write it as a JDBC PreparedStatement. This list could contain any number of names in it. Is the correct way to do this: SELECT last_name, first_name, middle_initial FROM names WHERE last_name IN (?) and then build a list of parameters? Or is there a better (more correct) way to do that? 回答1:

问题 How do I create prepared statements for insert and select queries in MySQL? I am using the MySQL2 gem, and my connection object looks like this: con = Mysql2::Client.new(:host => "#{ENV['DB_HOST']}", :port => '3306', :username => "#{ENV['DB_UNAME']}", :password => "#{ENV['DB_PWD']}", :database => 'dbname') 回答1: Unfortunately, mysql2 gem does not have prepared statement support yet. The contributors are planning to add such a feature in a near future, as we can see by this Pull Request

问题 I am testing fastload example code from an official teradata website . To err on the side of caution , I use the sample FastLoad1.csv located on their samples.jar here When I run this sample code, I get an error in this line pstmtFld.setAsciiStream(1, dataStream, -1); // This method is not implemented How must setAsciiStream be used with a prepared statement ? Am i using the setAsciiStream correctly ? Here is the error message in console Attempting connection to Teradata with FastLoadCSV.