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MySQL Connector/NET Developer Guide  /  Connector/NET 6.10 Connection-String Options Reference

Chapter 6 Connector/NET 6.10 Connection-String Options Reference

This chapter describes both the general MySQL Connector/NET 6.10 connection-string options that apply to all server configurations and the options related to systems using a connection pool (see Connection Pooling Options). Connection options have a default value that you can override by defining the new value in the connection string.

For instructions about how to use connection strings with Connector/NET, see Section 5.1.1, “Creating a Connector/NET Connection String”.

General Options

The Connector/NET 6.10 options that follow are for general use with connection strings and apply to all MySQL server configurations:

AllowBatch , Allow Batch

Default: true

When true, multiple SQL statements can be sent with one command execution. Note: starting with MySQL 4.1.1, batch statements should be separated by the server-defined separator character. Statements sent to earlier versions of MySQL should be separated by the semicolon character (;).

AllowUserVariables , Allow User Variables

Default: false

Setting this to true indicates that the provider expects user variables in the SQL. This option was introduced with the 5.2.2 connector.

AllowZeroDateTime , Allow Zero Datetime

Default: false

If set to True, MySqlDataReader.GetValue() returns a MySqlDateTime object for date or datetime columns that have disallowed values, such as zero datetime values, and a System.DateTime object for valid values. If set to False (the default setting) it causes a System.DateTime object to be returned for all valid values and an exception to be thrown for disallowed values, such as zero datetime values.

AutoEnlist , Auto Enlist

Default: true

If AutoEnlist is set to true, which is the default, a connection opened using TransactionScope participates in this scope, it commits when the scope commits and rolls back if TransactionScope does not commit. However, this feature is considered security sensitive and therefore cannot be used in a medium trust environment.

As of 6.10.6, this option is supported in .NET Core 2.0 implementations.

BlobAsUTF8ExcludePattern

Default: null

A POSIX-style regular expression that matches the names of BLOB columns that do not contain UTF-8 character data. See Section 5.16, “Character Set Considerations for Connector/NET” for usage details.

BlobAsUTF8IncludePattern

Default: null

A POSIX-style regular expression that matches the names of BLOB columns containing UTF-8 character data. See Section 5.16, “Character Set Considerations for Connector/NET” for usage details.

CertificateFile , Certificate File

Default: null

This option specifies the path to a certificate file in PKCS #12 format (.pfx). For an example of usage, see Section 4.10, “Tutorial: Using SSL with Connector/NET”. This option was introduced with the 6.2.1 connector.

CertificatePassword , Certificate Password

Default: null

Specifies a password that is used in conjunction with a certificate specified using the option CertificateFile. For an example of usage, see Section 4.10, “Tutorial: Using SSL with Connector/NET”. This option was introduced with the 6.2.1 connector.

CertificateStoreLocation , Certificate Store Location

Default: null

Enables you to access a certificate held in a personal store, rather than use a certificate file and password combination. For an example of usage, see Section 4.10, “Tutorial: Using SSL with Connector/NET”. This option was introduced with the 6.2.1 connector.

CertificateThumbprint , Certificate Thumbprint

Default: null

Specifies a certificate thumbprint to ensure correct identification of a certificate contained within a personal store. For an example of usage, see Section 4.10, “Tutorial: Using SSL with Connector/NET”. This option was introduced with the 6.2.1 connector.

CharacterSet , CharSet , Character Set

Specifies the character set that should be used to encode all queries sent to the server. Results are still returned in the character set of the result data.

CheckParameters , Check Parameters

Default: true

Indicates if stored routine parameters should be checked against the server.

CommandInterceptors , Command Interceptors

The list of interceptors that can intercept SQL command operations.

ConnectionProtocol , Protocol , Connection Protocol

Default: socket

Specifies the type of connection to make to the server. Values can be: socket or tcp for a socket connection, pipe for a named pipe connection, unix for a Unix socket connection, memory to use MySQL shared memory.

ConnectionTimeout , Connect Timeout , Connection Timeout

Default: 15

The length of time (in seconds) to wait for a connection to the server before terminating the attempt and generating an error.

ConvertZeroDateTime , Convert Zero Datetime

Default: false

Use true to have MySqlDataReader.GetValue() and MySqlDataReader.GetDateTime() return DateTime.MinValue for date or datetime columns that have disallowed values.

Database , Initial Catalog

Default: mysql

The case-sensitive name of the database to use initially.

DefaultCommandTimeout , Default Command Timeout

Default: 30

Sets the default value of the command timeout to be used. This does not supersede the individual command timeout property on an individual command object. If you set the command timeout property, that will be used. This option was introduced with the 5.1.4 connector.

DefaultTableCacheAge , Default Table Cache Age

Default: 60

Specifies how long a TableDirect result should be cached, in seconds. For usage information about table caching, see Section 5.6, “Using Connector/NET with Table Caching”. This option was introduced with the 6.4 connector.

ExceptionInterceptors , Exception Interceptors

The list of interceptors that can triage thrown MySqlException exceptions.

FunctionsReturnString , Functions Return String

Default: false

Causes the connector to return binary or varbinary values as strings, if they do not have a table name in the metadata.

IgnorePrepare , Ignore Prepare

Default: true

When true, instructs the provider to ignore any calls to MySqlCommand.Prepare(). This option is provided to prevent issues with corruption of the statements when used with server-side prepared statements. If you use server-side prepare statements, set this option to false. This option was introduced with the 5.0.3 and 1.0.9 connectors.

includesecurityasserts , include security asserts

Default: false

Must be set to true when using the MySQLClientPermissions class in a partial trust environment, with the library installed in the GAC of the hosting environment. This requirement is new for partial-trust applications in Connector/NET 6.6.4 and higher. See Section 5.19, “Working with Partial Trust / Medium Trust” for details.

As of 6.10.6, this option is supported in .NET Core 2.0 implementations.

IntegratedSecurity , Integrated Security

Default: no

Use Windows authentication when connecting to server. By default, it is turned off. To enable, specify a value of yes. (You can also use the value sspi as an alternative to yes.) For details, see Section 5.4, “Using the Windows Native Authentication Plugin”. This setting only applies to the Windows platform and was introduced with the 6.4.4 connector.

Currently not supported for .NET Core implementations.

InteractiveSession , Interactive , Interactive Session

Default: false

If set to true, the client is interactive. An interactive client is one where the server variable CLIENT_INTERACTIVE is set. If an interactive client is set, the wait_timeout variable is set to the value of interactive_timeout. The client will then time out after this period of inactivity. For more details, see Server System Variables in the MySQL Reference Manual.

As of 6.10.6, this option is supported in .NET Core 2.0 implementations.

Keepalive , Keep Alive

Default: 0

For TCP connections, idle connection time measured in seconds, before the first keepalive packet is sent. A value of 0 indicates that keepalive is not used. Before Connector/NET 6.6.7/6.7.5/6.8.4, this value was measured in milliseconds.

Logging

Default: false

When true, various pieces of information is output to any configured TraceListeners. See Section 5.14, “Using the Connector/NET Trace Source Object” for further details.

As of 6.10.6, this option is supported in .NET Core 2.0 implementations.

OldGuids , Old Guids

Default: false

This option was introduced in Connector/NET 6.1.1. The back-end representation of a GUID type was changed from BINARY(16) to CHAR(36). This was done to allow developers to use the server function UUID() to populate a GUID table - UUID() generates a 36-character string. Developers of older applications can add 'Old Guids=true' to the connection string to use a GUID of data type BINARY(16).

Password , pwd

The password for the MySQL account being used.

PersistSecurityInfo , Persist Security Info

Default: false

When set to false or no (strongly recommended), security-sensitive information, such as the password, is not returned as part of the connection if the connection is open or has ever been in an open state. Resetting the connection string resets all connection string values, including the password. Recognized values are true, false, yes, and no.

PipeName , Pipe Name , Pipe

Default: mysql

When set to the name of a named pipe, the MySqlConnection attempts to connect to MySQL on that named pipe. This setting only applies to the Windows platform.

Currently not supported for .NET Core implementations.

Port

Default: 3306

The port MySQL is using to listen for connections. This value is ignored if Unix socket is used.

ProcedureCacheSize , Procedure Cache Size , procedure cache , procedurecache

Default: 25

Sets the size of the stored procedure cache. By default, Connector/NET stores the metadata (input/output data types) about the last 25 stored procedures used. To disable the stored procedure cache, set the value to zero (0). This option was introduced with the 5.0.2 and 1.0.9 connectors.

Replication

Default: false

Indicates if this connection is to use replicated servers.

As of 6.10.6, this option is supported in .NET Core 2.0 implementations.

RespectBinaryFlags , Respect Binary Flags

Default: true

Setting this option to false means that Connector/NET ignores a column's binary flags as set by the server. This option was introduced with the 5.1.3 connector.

Server , Host , Data Source , DataSource , Address , Addr , Network Address

Default: localhost

The name or network address of the instance of MySQL to which to connect. Multiple hosts can be specified separated by commas. This can be useful where multiple MySQL servers are configured for replication and you are not concerned about the precise server you are connecting to. No attempt is made by the provider to synchronize writes to the database, so take care when using this option. In Unix environment with Mono, this can be a fully qualified path to a MySQL socket file. With this configuration, the Unix socket is used instead of the TCP/IP socket. Currently, only a single socket name can be given, so accessing MySQL in a replicated environment using Unix sockets is not currently supported.

SharedMemoryName , Shared Memory Name

Default: MYSQL

The name of the shared memory object to use for communication if the connection protocol is set to memory. This setting only applies to the Windows platform.

Currently not supported for .NET Core implementations.

sqlservermode , Sql Server Mode

Default: false

Allow SQL Server syntax. When set to true, enables Connector/NET to support square brackets around symbols instead of backticks. 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 was introduced with the 6.3.1 connector.

SslMode , SSL Mode , Ssl-Mode

Default: Preferred

This option was introduced in Connector/NET 6.2.1 and has the following values:

  • None - Do not use SSL.

  • Preferred - Use SSL if the server supports it, but allow connection in all cases.

  • Required - Always use SSL. Deny connection if server does not support SSL.

  • VerifyCA - Always use SSL. Validate the CA but tolerate name mismatch.

  • VerifyFull - Always use SSL. Fail if the host name is not correct.

tablecaching , Table Cache , tablecache

Default: false

Enables or disables caching of TableDirect commands. A value of true enables the cache while false disables it. For usage information about table caching, see Section 5.6, “Using Connector/NET with Table Caching”. This option was introduced with the 6.4 connector.

TreatBlobsAsUTF8 , Treat BLOBs as UTF8

Default: false

Setting this value to true causes BLOB columns to have a character set of utf8 with the default collation for that character set.

TreatTinyAsBoolean , Treat Tiny As Boolean

Default: true

Setting this value to false causes TINYINT(1) to be treated as an INT. See Numeric Type Overview for a further explanation of the TINYINT and BOOL data types.

UseAffectedRows , Use Affected Rows

Default: false

When true, the connection reports changed rows instead of found rows. This option was introduced with the 5.2.6 connector.

UseCompression , Compress , Use Compression

Default: false

Setting this option to true enables compression of packets exchanged between the client and the server. This exchange is defined by the MySQL client/server protocol.

Compression is used if both client and server support ZLIB compression, and the client has requested compression using this option.

A compressed packet header is: packet length (3 bytes), packet number (1 byte), and Uncompressed Packet Length (3 bytes). The Uncompressed Packet Length is the number of bytes in the original, uncompressed packet. If this is zero, the data in this packet has not been compressed. When the compression protocol is in use, either the client or the server may compress packets. However, compression will not occur if the compressed length is greater than the original length. Thus, some packets will contain compressed data while other packets will not.

UseDefaultCommandTimeoutForEF , Use Default Command Timeout For EF

Default: false

Enforces the command timeout of EFMySqlCommand, which is set to the value provided by the DefaultCommandTimeout property.

UseOldSyntax , Old Syntax , OldSyntax , Use Old Syntax

Default: false

This option was deprecated in Connector/NET 5.2.2 and removed in Connector/NET 6.10.2. All code should now be written using the '@' symbol as the parameter marker.

UsePerformanceMonitor , Use Performance Monitor , userperfmon , perfmon

Default: false

Indicates that performance counters should be updated during execution.

Currently not supported for .NET Core implementations.

UseProcedureBodies , Use Procedure Bodies , procedure bodies

Default: true

When set to true, the default value, Connector/NET expects the body of the procedure to be viewable. This enables it to determine the parameter types and order. Set the option to false when the user connecting to the database does not have the SELECT privileges for the mysql.proc (stored procedures) table or cannot view INFORMATION_SCHEMA.ROUTINES, and then explicitly set the types of all the parameters before the call and add the parameters to the command in the same order as they appear in the procedure definition.

This option was deprecated in Connector/NET 6.3.7 and removed in Connector/NET 6.10.4; use the Check Parameters option instead.

UserID , User Id , Username , Uid , User name , User

The MySQL login account being used.

UseUsageAdvisor , Use Usage Advisor , Usage Advisor

Default: false

Logs inefficient database operations.

As of 6.10.6, this option is supported in .NET Core 2.0 implementations.

Connection Pooling Options

The following options are related to connection pooling within connection strings. For more information about connection pooling, see Section 5.3, “Using Connector/NET with Connection Pooling”.

CacheServerProperties , Cache Server Properties

Default: false

Specifies whether server variable settings are updated by a SHOW VARIABLES command each time a pooled connection is returned. Enabling this setting speeds up connections in a connection pool environment. Your application is not informed of any changes to configuration variables made by other connections. This option was introduced with the 6.3 connector.

ConnectionLifeTime , Connection Lifetime

Default: 0

When a connection is returned to the pool, its creation time is compared with the current time, and the connection is destroyed if that time span (in seconds) exceeds the value specified by Connection Lifetime. This is useful in clustered configurations to force load balancing between a running server and a server just brought online. A value of zero (0) causes pooled connections to have the maximum connection timeout.

ConnectionReset , Connection Reset

Default: false

If true, the connection state is reset when it is retrieved from the pool. The default value of false avoids making an additional server round trip when obtaining a connection, but the connection state is not reset.

MaximumPoolsize , Maximum Pool Size , Max Pool Size , maxpoolsize

Default: 100

The maximum number of connections allowed in the pool. This option applies to Connector/NET 6.7 and higher.

MinimumPoolSize , Minimum Pool Size , Min Pool Size , minpoolsize

Default: 0

The minimum number of connections allowed in the pool. This option applies to Connector/NET 6.7 and higher.

Pooling

Default: true

When true, the MySqlConnection object is drawn from the appropriate pool, or if necessary, is created and added to the appropriate pool. Recognized values are true, false, yes, and no.


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