Connection String

********
Standard 
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;

********
Specifying TCP port
Server=myServerAddress;Port=1234;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
The port 3306 is the default MySql port.
The value is ignored if Unix socket is used.

Multiple servers
Use this to connect to a server in a replicated server configuration without concern on which server to use.
Server=serverAddress1, serverAddress2, serverAddress3;Database=myDataBase;Uid=myUsername;Pwd=myPassword;

Using encryption (old)
This one activates SSL encryption for all data sent between the client and server. The server must have a certificate installed.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Encrypt=true;
This option is available for Connector/NET version 5.0.3 through 6.2.1. From 6.2.1 use the SslMode option instead.

********
Using encryption (new)
Use SSL if the server supports it, but allow connection in all cases
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;SslMode=Preferred;
This option is available from Connector/NET version 6.2.1

********
Force encryption
Always use SSL. Deny connection if server does not support SSL.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;SslMode=Required;
This option is available from Connector/NET version 6.2.1

SSL with a file-based certificate
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;SSL Mode=Required;CertificateFile=C:\folder\client.pfx;CertificatePassword=pass;
This option is available from Connector/NET version 6.2.1

SSL with a personal store-based certificate
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;SSL Mode=Required;Certificate Store Location=CurrentUser;
This option is available from Connector/NET version 6.2.1

SSL with a thumbprint specific personal store-based certificate
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;SSL Mode=Required;Certificate Store Location=CurrentUser;Certificate Thumbprint=479436009a40f3017a145cf8479e7694d7aadef0;
This option is available from Connector/NET version 6.2.1

Disallow batches
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;AllowBatch=False;

Allow User Variables
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;AllowUserVariables=True;
This option is available from Connector/NET version 5.2.2

Invalid DateTime's 1
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;AllowZeroDateTime=True;
Returns a MySqlDateTime object for invalid values and a System.DateTime object for valid values.

Invalid DateTime's 2
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;ConvertZeroDateTime=True;
Returns System.DateTime.MinValue valued System.DateTime object for invalid values and a System.DateTime object for valid values.
M

Disable transaction participation
The use of auto enlist transactionscope (default behaviour) could cause trouble in medium trust environments.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;AutoEnlist=False;

Skip parameter checks for stored routines
Default behaviour is that parameters for stored routines (stored procedures) are checked against the server
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;CheckParameters=False;
Some permissions and value casting related errors reported fixed when using this connection option.

Skip parameter type and order matching for stored procedures
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;UseProcedureBodies=False;
The default behaviour is to read tables mysql.proc/INFORMATION_SCHEMA.ROUTINES and try to map provided command parameter values to the called procedures parameters and type cast values accordingly.
This can be troublesome if permissions to the (aforementioned) sproc info tables are insufficient.
The driver will not automatically map the parameters so you must manually set parameter types and you must also make sure to add the parameters to the command object in the exact order as appeared in the procedure definition.
This option is available from Connector/NET version 5.0.4

Use Table Caching
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;tablecache=true;DefaultTableCacheAge=30;
Specifying DefaultTableCacheAge is optional, default value is 60 seconds.
This option is available from Connector/NET version 6.4

Count changed rows instead of found rows
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;UseAffectedRows=True;
This option is available from Connector/NET version 5.2.6

Compress network communication between client and server
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;UseCompression=True;

Log inefficient database operations
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;UseUsageAdvisor=True;

Enable performance counters
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;UsePerformanceMonitor=True;

Connection Pooling
From version 6.2 idle connections are removed from the pool, freeing resources on the client (sockets) and the server (sockets and threads). Do not manually keep (global) connections and open close. Keep connection object creation and disposal as tight as possible, this might be counterintuitive but pooling mechanisms will take care of caching well and your code will be cleaner.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Pooling=True;
This is the default behaviour.

Connection Pool size
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;MinimumPoolSize=10;maximumpoolsize=50;
Default values are 0 and 100.

Disable connection pooling
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Pooling=False;

Connection state reset when obtained from pool
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;ConnectionReset=True;
Makes an additional round trip to the server when obtaining a connection from the pool and connection state will be reset.

Recycle connections in pool
This is useful in load balancing scenarios when available servers change you don't want 100 constant connections in the pool pointing to only one server.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;ConnectionLifeTime=300;
Specified in seconds, the amount of time after connection object creation the connection will be destroyed. Destruction will only happen when connections are returned to pool.

Do not update server settings on connections in pool
A connection might be long lived in the pool, however the connections server settings are updated (SHOW VARIABLES command) each time returned to the pool. This makes the client use of the connection object up to date with the correct server settings. However this causes a round trip and to optimize pooling performance this behaviour can be turned off.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;CacheServerProperties=True;
This option is available from Connector/NET version 6.3

Use Windows authentication
Server=myServerAddress;Database=myDataBase;IntegratedSecurity=yes;Uid=auth_windows;
This option is available from Connector/NET version 6.4.4
The Windows Native Authentication Plugin must be installed for this to work.

Keep TCP Sockets alive
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Keepalive=10;
Number of seconds between each keep-alive package send.

Use BINARY(16) GUIDs
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;OldGuids=True;
This option is available from Connector/NET version 6.1.1

Disable Stored procedure cache
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;ProcedureCacheSize=0;
The default is 25, meaning that stored procedure meta data (such as input/output data types etc) for the latest 25 called procedures will be cached in client memory.
This option is available from Connector/NET version 5.0.2

Allow square brackets around symbols (instead of backticks)
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;sqlservermode=True;
This enables Visual Studio wizards that bracket symbols with [] to work with Connector/Net. This option incurs a performance hit, so should only be used if necessary.
This option is available from Connector/NET version 6.3.1

Specifying default command timeout
Use this one to specify a default command timeout for the connection. Please note that the property in the connection string does not supercede the individual command timeout property on an individual command object.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;default command timeout=20;
This option is available from Connector/NET version 5.1.4.

Specifying connection attempt timeout
Use this one to specify the length in seconds to wait for a server connection before terminating the attempt and receive an error.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Connection Timeout=5;

Inactivating prepared statements
Use this one to instruct the provider to ignore any command prepare statements and prevent corruption issues with server side prepared statements.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Ignore Prepare=true;
The option was added in Connector/NET version 5.0.3 and Connector/NET version 1.0.9.

Specifying network protocol
Use this one to specify which network protocol to use for the connection.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Protocol=socket;
"socket" is the default value used if the key isn't specified. Value "tcp" is an equivalent for "socket".
Use "pipe" to use a named pipes connection, "unix" for a Unix socket connection and "memory" to use MySQL shared memory.

Shared memory protocol
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Protocol=memory;Shared Memory Name=MYSQL;
It's possible to explicit set the shared memory object name used for communication.

Named pipes protocol
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Protocol=pipe;PipeName=mypipename;
It's possible to explicit set the pipe name used for communication, if not set, 'mysql' is the default value.

Named pipes alternative
Server=myServerAddress;Port=-1;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
It is the port value of -1 that tells the driver to use named pipes network protocol. This is available on Windows only. The value is ignored if Unix socket is used.

Unix socket connection
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Protocol=memory;Shared Memory Name=MYSQL;
It's possible to explicit set the shared memory object name used for communication.

Specifying character set
Use this one to specify which character set to use to encode queries sent to the server.
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;CharSet=utf8;
Note! Use lower case value utf8 and not upper case UTF8 as this will fail.
Note that resultsets still are returned in the character set of the data returned.

Index

SQL Server

MSSQL LocalDB

MySQL

SQLite

Log