mysql-connector

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: com.mysql.jdbc.Driver not found with mysql connector in buildpath I'm working on connecting MySQL database to a Java program. When I run my program I am getting this error Class Not Found Exception: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver for this line try{ Class.forName("com.mysql.jdbc.Driver").newInstance(); So, what's the problem? I'm placing the connector in the project's file.. Is the

问题 Summary: Inserting 100k rows at a time with 1k batches (yes it's definitely being batched) and time to insert is increasing for each batch. Trying to understand why. Original Question: JProfiler shows a lot of time spent reading an InputStream in ReadAheadInputStream.fill. Update: Per comment below from EJP "The time is being spent blocked in read(), while the database server is executing the statement and preparing the response" What could cause so much time to be spent here? Details:

问题 How can I make my transactions to wait if there is still an un-committed/un-roll-backed transaction in MySQL? Currently I do my transactions on the code side, not on the DB Stored Procedure side, like this: cmd.Connection.BeginTransaction(); try { // db codes here cmd.Transaction.Commit(); } catch { cmd.Transaction.Rollback(); throw; } finally { cmd.Connection.Close(); } I want for other transactions to wait until the previous transaction is finished. Since I have, in some of my stored proc,

问题 I have just replaced my mysql connector jar 3.1.12 to 5.1.27. and getting error You need to specify Statement.RETURN_GENERATED_KEYS to the Statement.executeUpdate() or Connection.prepareStatement(). I got the solution that i should use PreparedStatement ps = connection.prepareStatement(SQL, Statement.RETURN_GENERATED_KEYS); instead PreparedStatement ps = connection.prepareStatement(SQL); The main problem is how can I replace this in whole project and is there any method to set it globally? Is

问题 Trying to build a simple mysql connection, but getting a bad_alloc and I can't figure out how to solve this, even looking at similar posts here is my code #include <iostream> #include <stdlib.h> #include <sstream> #include <memory> #include <string> #include <stdexcept> #include "mysql_connection.h" #include "cppconn\driver.h" #include "cppconn\statement.h" #include "cppconn\connection.h" #include "cppconn\exception.h" #include "cppconn\prepared_statement.h" #include "cppconn\statement.h"

问题 I've just run into a confusing issue in Groovy while trying to modify a MySQL database. What appears to be identical code throws an Exception unless my GroovyString is explicitly converted to a java.lang.String : import groovy.sql.Sql def sql = Sql.newInstance('jdbc:mysql://localhost/test?useUnicode=yes&characterEncoding=UTF-8', 'user', 'pass', 'com.mysql.jdbc.Driver') def tableName = 'my_table' sql.execute "truncate $tableName" throws: com.mysql.jdbc.exceptions.jdbc4

问题 I have a python program which makes mysql calls that I build into an exe using pyinstaller. The following problem occurs with either a --onefile or a --onedir compile using pyinstaller. I have been able to use either mysqldb or mysql.connector to successfully connect and make queries. Here is the mysqldb connect logic: # from http://www.lfd.uci.edu/~gohlke/pythonlibs/#mysql-python try: db = MySQLdb.connect(host=hostname,user=username,passwd=password) except MySQLdb.Error as e: reply = QtGui

问题 This code works if it's in main: int main(void) { cout << endl; cout << "Running statement." << endl; try { sql::Driver *driver; sql::Connection *con; sql::Statement *stmt; /* Create a connection */ driver = get_driver_instance(); con = driver->connect("address:port", "user", "pass"); /* Connect to the MySQL test database */ con->setSchema("database"); stmt = con->createStatement(); stmt->execute("TRUNCATE TABLE words"); delete stmt; delete con; } catch (sql::SQLException &e) { cout << "# ERR

问题 I want to start and stop mysql through java program. I tried solution from this question, but it failed to start the mysql. Then I tried using other commands as below: private static String commandStart = SQL_INSTALL_DIR + "/bin/mysqld"; private static String commandStop = SQL_INSTALL_DIR + "/bin/mysqld -u root shutdown"; public static void main(String[] args) { Connection con = null; Statement st = null; ResultSet rs = null; startMysql(); String url = "jdbc:mysql://localhost:3306/testdb";

问题 As a reaction to MySqlParameter as TableName, it seems that MySQL's Connector/NET library doesn't support table names from user input in the following way: MySqlCommand cmd = new MySqlCommand("SELECT * FROM @table"); cmd.Parameters.AddWithValue("@table",TableNameFromUserInput); So I tried to find another way, but I couldn't find any libraries that did this for me. When searching for how to do this manually, I couldn't found anything that didn't tell you to use "prepared statements" from some