I am trying to connect to the mysql database at localhost with D but when i want to compile my code i am getting the following error from the terminal:
module mysql is in file 'mysql.d'
which cannot be readimport path[0] = /Library/D/dmd/src/phobos
import path[1] = /Library/D/dmd/src/druntime/import
#!/usr/bin/env dub
import mysql;
void main (){
//Connect
con = new Connection("host=localhost; port =3306; user=root; pwd=password; db=awesomeschema");
scope(exit) con.close();
if (con.closed()){
writeln("connected");
} else {
writeln("conn closed");
}
}
Your code example has no dependencies listed.
No Mysql client library has been requested. Hence it fails to compile.
Related
I have simple vibe-D program which is trying to connect to SQL:
import std.stdio;
import mysql;
import vibe.d;
void main()
{
MySQLPool db_pool = new MySQLPool("localhost","root","","dbname",3306);
Connection db = db_pool.lockConnection();
// same thing happens with:
// string connectionStr = "host=localhost;port=3306;user=root;db=dbname";
// db = new Connection(connectionStr);
}
(I deleted everything else for simplification)
Dependencies:
"dependencies": {
"mysql-native": "~>3.2.0",
"vibe-d": "~>0.9.4"
}
And it fails to connect with:
object.Exception#../../../.dub/packages/vibe-core-1.22.4/vibe-core/source/vibe/core/net.d(256): Failed to connect to [0:0:0:0:0:0:0:1]:3306: refused
When I try it without vibe-d in the dub project (using phobos sockets) it connects with no problem. What am I doing wrong?
that's an ipv6 address.... is your mysql listening on that interface? might help trying 127.0.0.1 instead of localhost and seeing what happens.
can also consider reconfiguring mysql to listen on all interfaces too, including the ipv6
So I'm trying to deploy my Django project using lambda, with zappa. I'm using MySQL for DB engine. Now after doing some research, I realized that I needed to create a custom Django command to create DB, since I'm using MySQL. So I created crate_db command, zappa updated, then ran zappa manage dev create_db. Then I got this error: 2004 (HY000): Can't create TCP/IP socket (97)
below is my create_db.py file, for your information.
import sys
import logging
import mysql.connector
import os
from django.core.management.base import BaseCommand, CommandError
from django.conf import settings
rds_host = os.environ.get("MY HOST")
db_name = os.environ.get("")
user_name = os.environ.get("MY USERNAME")
password = os.environ.get("MY PASSWORD")
port = os.environ.get("3306")
logger = logging.getLogger()
logger.setLevel(logging.INFO)
class Command(BaseCommand):
help = 'Creates the initial database'
def handle(self, *args, **options):
print('Starting db creation')
try:
db = mysql.connector.connect(host=rds_host, user=user_name,
password=password, db="mysql", connect_timeout=10)
c = db.cursor()
print("connected to db server")
c.execute("""CREATE DATABASE bookcake_db;""")
c.execute("""GRANT ALL ON bookcake_db.* TO 'ryan'#'%'""")
c.close()
print("closed db connection")
except mysql.connector.Error as err:
logger.error("Something went wrong: {}".format(err))
sys.exit()
Any ideas? Thanks.
I try use tarantool as application server and want connect from tarantool to mysql.
In lua i write a function:
local function mysql_data(query, limit)
local conn = mysql.connect({host = mysql_host, user = mysql_user, password = mysql_password, db = mysql_database})
local tuples = conn:execute(query, limit)
return tuples
end
but in log i see:
2016-03-29 17:57:37.358 [8553] main/101/grepmaillog_app.lua F> /home/lua/./grepmaillog_app.lua:12: module 'mysql' not found:
no field package.preload['mysql']
no file './mysql.lua'
no file './mysql/init.lua'
no file '/root/.luarocks/share/lua/5.1/mysql.lua'
no file '/root/.luarocks/share/lua/5.1/mysql/init.lua'
no file '/root/.luarocks/share/lua/mysql.lua'
no file '/root/.luarocks/share/lua/mysql/init.lua'
no file '/usr/local/share/tarantool/mysql.lua'
no file '/usr/local/share/tarantool/mysql/init.lua'
no file '/usr/share/tarantool/mysql.lua'
no f
How i can install package mysql for tarantool ?
Please install tarantool-mysql package from http://tarantool.org/download.html
I have grails 2.0 which comes with H2 database and dbconsole.
I want to take the database backup from dbconsole:
databse url : "jdbc:mysql://localhost/opal"
Username : root
password: (none)
in the tools section of dbconsole there is a option to backup the database.
it will ask 3 things
Target file name: ~/backup.zip(by default)
Source directory:
Source database name: opal (name of my database)
when i press run , it gives error,
No database files have been found in directory E:/Workspace/opal for the database opal
can anybody suggest how to take the database backup.
I've never gotten that to work. If you just want a snapshot of data for development (load on startup) I found that using DBUnit to export/import the data worked great for me. I wrote a script to export it that I call from the console:
class DataExport {
def ctx = SCH.servletContext.getAttribute(GA.APPLICATION_CONTEXT)
def exportData() {
println "-->export"
def ds = ctx.dataSourceUnproxied
println ds.dump()
Connection jdbcConnection = ctx.dataSourceUnproxied.getConnection()
IDatabaseConnection connection = new DatabaseConnection(jdbcConnection);
println connection.dump()
ITableFilter filter = new DatabaseSequenceFilter(connection);
IDataSet dataset = new FilteredDataSet(filter, connection.createDataSet());
FlatXmlDataSet.write(dataset, new File("full.xml").newWriter());
connection.close()
}
}
And then in bootstrap you can load it back in
Connection jdbcConnection
FlatXmlDataSet dataSet = new FlatXmlDataSetBuilder().build(new ClassPathResource('resources/data/full.xml').inputStream)
jdbcConnection = ctx.dataSource.getConnection()
IDatabaseConnection connection = new DatabaseConnection(jdbcConnection);
try {
DatabaseOperation.INSERT.execute(connection, dataSet)
} catch(e) {
e.printStackTrace()
throw(e)
} finally {
jdbcConnection.close()
}
log.info 'data loaded'
I think this site would be quite helpful. Or, on taking dump of the database and to restore the database try snippet below:
mysqldump -u root -p my_database Table1 Table2 > /home/user/tablesDump.sql;
and to restore the table(s) back:
mysql -u root -p my_database_2
mysql> source /home/user/tablesDump.sql;
Both tables were created in my_database_2.
So I want to create a JDBC connection to MySQL server that is installed on my pc, here are the steps,
I installed MySQL with the username and password "root", downloaded mysql-connector-java and from theere I coped the JAR "mysql-connector-java-5.1.12-bin" to "C:\Sun\SDK\jdk\jre\lib\ext", I then added it as an external JAR in my project in eclipse, now in my class I have this code:
public void initialiseDatabase()
{
try {
// Load the Driver class.
Class.forName("com.mysql.jdbc.Driver");
//Create the connection using the static getConnection method
databaseConnection = DriverManager.getConnection (databaseUrl+databaseName,
dbUserName, dbPassword);
sqlStatement = databaseConnection.createStatement();
}
catch (SQLException e) {e.printStackTrace();}
catch (Exception e) {e.printStackTrace();}
}
(this is going to be psuedocode cause I am reading from a properties file and don't want the one helping me reading through long lines of code from main to figure out all the variables),
where databaseUrl = "127.0.0.1"
dbUserName = "root"
dbPassword = "root"
databaseName = "MySQL" //this one I am not sure of, do I need to create it or is it set inherenrly?
now the MySQL server is up and running, but when I call the method initialiseDatabase the following exception is thrown:
"java.sql.SQLException: No suitable driver found for rootroot
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Proxy$JDBCConnection.initialiseDatabase(Proxy.java:721)"
when line 721 is:
sqlStatement = databaseConnection.createStatement();
Where have I gone wrong?
thanks
Your database url should look like this:
jdbc:mysql://host:port/database
Example, if you use localhost, the default port and a database named cachedb, your url would be:
jdbc:mysql://localhost/cachedb