C#迁移之callXBFLibrary - ADO.net
我们经常需要与ADO.net的连接串打交道。根据键/值来设置连接数据库。
在我们使用数据库中,在平常C/S架构中使用最多是MySQL!针对ADO.net连接串,MySQL有一些固定的键/值供我们选择,详细请参见附录。
在标准连接中,我们只需要:
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
其他的连接串选项在标准的基础上增加,
比如增加禁止连接池:
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword; Pooling=False;增加转换空值(日期类型)
Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword; ConvertZeroDateTime=True;
对ADO连接串和ADO.net(MySQL)分解和合成的代码:
Form1.cs
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; using xbfLibsLib; namespace callXBFLibrary { public partial class frmCall_XBF : Form { private Cwin32API ini; private string strConn; private string currDir; public frmCall_XBF() { InitializeComponent(); currDir = Directory.GetCurrentDirectory(); ini = new Cwin32API(currDir + "/xbfConfig.ini"); } private void btnWriteXBF_Click(object sender, EventArgs e) { Boolean flagSQL = false; Boolean flagMSSQL = false; Boolean flagSecu = false; string sectionName = ini.readIniFileVal("config", "type"); string strSrv = ini.readIniFileVal(sectionName, "Server"); if (!Equals(strSrv, "")) flagSQL = true; if (flagSQL) { if (Equals(sectionName, "MSSQL")) flagMSSQL = true; if (flagMSSQL) strConn = "dbType=0;" + "Password=" + ini.readIniFileVal(sectionName, "Pwd") + ";" + "Persist Security Info=True;" + "User ID=" + ini.readIniFileVal(sectionName, "User") + ";" + "Initial Catalog=" + ini.readIniFileVal(sectionName, "DB") + ";" + "Data Source=" + ini.readIniFileVal(sectionName, "Server"); else strConn = "dbType=2;" + "Data Source=" + ini.readIniFileVal(sectionName, "Server") + ";" + "User Id=" + ini.readIniFileVal(sectionName, "User") + ";" + "Password=" + ini.readIniFileVal(sectionName, "Pwd") + ";" + "Database=" + ini.readIniFileVal(sectionName, "DB") + ";" + "Convert Zero Datetime=True"; } else // MS Access { string strPWD = ini.readIniFileVal(sectionName, "Pwd"); if (!Equals(strPWD, "")) flagSecu = true; if (flagSecu) { strConn = "dbType=1;" + "Data Source=" + ini.readIniFileVal(sectionName, "DB") + ";" + "Persist Security Info=False;" + "Jet OLEDB:Database Password=" + ini.readIniFileVal(sectionName, "Pwd"); } else { strConn = "dbType=1;" + "Data Source=" + ini.readIniFileVal(sectionName, "DB") + ";" + "Persist Security Info=True"; } } MessageBox.Show(strConn); xbfLibsLib.genXBFileClass xbf = new genXBFileClass(); xbf.WriteXBFile(strConn); } private void btnReadXBF_Click(object sender, EventArgs e) { genXBFileClass xbf = new genXBFileClass(); string filePath = currDir + "/" + edtFileName.Text; string strRet = xbf.ReadXBFile(filePath); MessageBox.Show(strRet); } } }xbfConfig.ini
[config] type = MSSQL [MS-Access] DB = d:\composite.mdb Pwd = [MSSQL] Server = test DB = pubs User = sa Pwd = 123456 [MySQL] Server = 192.168.1.107 DB = mysql User = admin Pwd = admin
参考文章:
I. C#迁移之callXBFLibrary - 1(Windows Application)
II. C#迁移之callXBFLibrary - 2(调用非托管DLL)
III. C#迁移之callXBFLibrary - 3(调用COM)
IV. Connector/Net Connection String Options Reference
V. MySQL Connector/Net connection strings
附录:
Table 7.1 ADO.net for MySQL 连接串选项 - 通用
Name | Default | Description |
---|---|---|
Allow Batch, AllowBatch | 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 ‘;‘. |
Allow User Variables,AllowUserVariables | false | Setting this to true indicates that the provider expects user variables in the SQL. This option was added in Connector/Net version 5.2.2. |
Allow Zero Datetime,AllowZeroDateTime | false | If set to True, MySqlDataReader.GetValue() returns aMySqlDateTime object for date or datetime columns that have disallowed values, such as zero datetime values, and aSystem.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. |
Auto Enlist, AutoEnlist | 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. |
BlobAsUTF8ExcludePattern | null | A POSIX-style regular expression that matches the names of BLOB columns that do not contain UTF-8 character data. SeeSection 6.16, “Character Set Considerations for Connector/Net” for usage details. |
BlobAsUTF8IncludePattern | null | A POSIX-style regular expression that matches the names of BLOB columns containing UTF-8 character data. SeeSection 6.16, “Character Set Considerations for Connector/Net” for usage details. |
Certificate File,CertificateFile | null | This option specifies the path to a certificate file in PKCS #12 format (.pfx). For an example of usage, see Section 5.7, “Tutorial: Using SSL with MySQL Connector/Net”. Was introduced with 6.2.1. |
Certificate Password,CertificatePassword | null | Specifies a password that is used in conjunction with a certificate specified using the option CertificateFile. For an example of usage, see Section 5.7, “Tutorial: Using SSL with MySQL Connector/Net”. Was introduced with 6.2.1. |
Certificate Store Location,CertificateStoreLocation | 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 5.7, “Tutorial: Using SSL with MySQL Connector/Net”. Was introduced with 6.2.1. |
Certificate Thumbprint,CertificateThumbprint | null | Specifies a certificate thumbprint to ensure correct identification of a certificate contained within a personal store. For an example of usage, see Section 5.7, “Tutorial: Using SSL with MySQL Connector/Net”. Was introduced with 6.2.1. |
CharSet, Character Set,CharacterSet | Specifies the character set that should be used to encode all queries sent to the server. Resultsets are still returned in the character set of the result data. | |
Check Parameters,CheckParameters | true | Indicates if stored routine parameters should be checked against the server. |
Command Interceptors,CommandInterceptors | The list of interceptors that can intercept SQL command operations. | |
Connect Timeout, Connection Timeout, ConnectionTimeout | 15 | The length of time (in seconds) to wait for a connection to the server before terminating the attempt and generating an error. |
Connect_Attrs | Passes a predefined set of key/value pairs containing connection-specific data items to the server, for application-defined purposes. connector/Net automatically transmits the following attributes: _pid, _client_version,_platform, _program_name, _os, _os_details, and_thread. See Performance Schema Connection Attribute Tables for the Performance Schema tables to query on the server side to make use of these attributes. | |
Convert Zero Datetime,ConvertZeroDateTime | false | 数据表中有空值的时候,需要使用此选项。 |
Default Command Timeout,DefaultCommandTimeout | 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 added in Connector/Net 5.1.4 |
Default Table Cache Age,DefaultTableCacheAge | 60 | Specifies how long a TableDirect result should be cached, in seconds. For usage information about table caching, seeSection 6.7, “Using Connector/Net with Table Caching”. This option was added in Connector/Net 6.4. |
enableSessionExpireCallback | false | When set to true, causes the session-expiry scanner to raise the session_end event before deleting the session data stored in the my_aspnet_sessions table, when a session times out. Enable this option to write additional application-specific cleanup code to handle thesession_end event of the global.asax class, before the stored data of the session gets deleted. Within the session_end method, any other required cleanup can be done. This option was added in Connector/Net 6.4.5; it is not yet available in Connector/Net 6.5.x releases. |
Encrypt, UseSSL | false | For Connector/Net 5.0.3 and later, when true, SSL encryption is used for all data sent between the client and server if the server has a certificate installed. Recognized values are true, false, yes, and no. In versions before 5.0.3, this option had no effect. From version 6.2.1, this option is deprecated and is replaced by SSL Mode. The option still works if used. If this option is set to true, it is equivalent toSSL Mode = Preferred. |
Exception Interceptors,ExceptionInterceptors | The list of interceptors that can triage thrownMySqlException exceptions. | |
Functions Return String,FunctionsReturnString | false | Causes the connector to return binary/varbinary values as strings, if they do not have a tablename in the metadata. |
Host, Server, Data Source,DataSource, Address, Addr,Network Address | localhost | 如果使用多个服务器需要使用逗号分隔。 |
Ignore Prepare,IgnorePrepare | true | When true, instructs the provider to ignore any calls toMySqlCommand.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 added in Connector/Net 5.0.3 and Connector/Net 1.0.9. |
includesecurityasserts,include security asserts | false | Must be set to true when using theMySQLClientPermissions 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. SeeSection 6.19, “Working with Partial Trust / Medium Trust” for details. |
Initial Catalog, Database | mysql | 使用的数据库 |
Interactive, Interactive Session, InteractiveSession | 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. |
Integrated Security,IntegratedSecurity | 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 6.5, “Using the Windows Native Authentication Plugin”. This option was introduced in Connector/Net 6.4.4. |
Keep Alive, Keepalive | 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. |
Logging | false | When true, various pieces of information is output to any configured TraceListeners. See Section 6.14, “Using the MySQL Connector/Net Trace Source Object” for further details. |
Old Guids, OldGuids | false | This option was introduced in Connector/Net 6.1.1. The backend representation of a GUID type was changed fromBINARY(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). |
Old Syntax, OldSyntax, Use Old Syntax, UseOldSyntax | false | This option was deprecated in Connector/Net 5.2.2. All code should now be written using the ‘@‘ symbol as the parameter marker. |
Password, pwd | 登陆用户的密码。 | |
Persist Security Info,PersistSecurityInfo | 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. |
Pipe Name, Pipe, PipeName | mysql | When set to the name of a named pipe, theMySqlConnection attempts to connect to MySQL on that named pipe. This setting only applies to the Windows platform. |
Port | 3306 | 使用端口(默认不用填写)。如果更改了默认(3306),需要填写。 |
Procedure Cache Size,ProcedureCacheSize,procedure cache,procedurecache | 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 added in Connector/Net 5.0.2 and Connector/Net 1.0.9. |
Protocol, Connection Protocol, ConnectionProtocol | 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. |
Replication | false | Indicates if this connection is to use replicated servers. |
Respect Binary Flags,RespectBinaryFlags | true | Setting this option to false means that Connector/Net ignores a column‘s binary flags as set by the server. This option was added in Connector/Net version 5.1.3. |
Shared Memory Name,SharedMemoryName | MYSQL | The name of the shared memory object to use for communication if the connection protocol is set to memory. |
Sql Server Mode,sqlservermode | 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 added in version 6.3.1. |
SSL Mode, SslMode | None | This option has the following values:
This option was introduced in MySQL Connector/Net 6.2.1. |
Table Cache, tablecache,tablecaching | 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 6.7, “Using Connector/Net with Table Caching”. This option was added in Connector/Net 6.4. |
Treat BLOBs as UTF8,TreatBlobsAsUTF8 | false | |
Treat Tiny As Boolean,TreatTinyAsBoolean | 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. |
Use Affected Rows,UseAffectedRows | false | When true, the connection reports changed rows instead of found rows. This option was added in Connector/Net version 5.2.6. |
Use Procedure Bodies,UseProcedureBodies,procedure bodies | true | When set to true, the default value, MySQL 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 themysql.proc (stored procedures) table, or cannot viewINFORMATION_SCHEMA.ROUTINES. In this case, MySQL Connector/Net cannot determine the types and order of the parameters, and must be alerted to this fact by setting this option to false. When set to false, MySQL Connector/Net does not rely on this information being available when the procedure is called. Because MySQL Connector/Net will not be able to determine this information, 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 added in MySQL Connector/Net 5.0.4 and MySQL Connector/Net 1.0.10. |
User Id, UserID, Username,Uid, User name, User | 登陆用户名 | |
Compress, Use Compression,UseCompression | 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. |
Use Usage Advisor, Usage Advisor, UseUsageAdvisor | false | Logs inefficient database operations. |
Use Performance Monitor,UsePerformanceMonitor,userperfmon, perfmon | false | Indicates that performance counters should be updated during execution. |
Table 7.2 ADO.net for MySQL 连接串选项 - 连接池
Name | Default | Description |
---|---|---|
Cache Server Properties ,CacheServerProperties |
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 added in Connector/Net 6.3. |
Connection Lifetime ,ConnectionLifeTime |
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. |
Connection Reset ,ConnectionReset |
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. |
Maximum Pool Size , Max
Pool Size ,MaximumPoolsize ,maxpoolsize (only
for Connector/Net 6.7 and later) |
100 | The maximum number of connections allowed in the pool. |
Minimum Pool Size , Min
Pool Size ,MinimumPoolSize ,minpoolsize (only
for Connector/Net 6.7 and later) |
0 | The minimum number of connections allowed in the pool. |
Pooling |
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 . |
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。