API Query Data Model

Connection String Options

  1. Auth Scheme
  2. Auto Cache
  3. Batch Size
  4. Cache Connection
  5. Cache Driver
  6. Cache Location
  7. Cache Metadata
  8. Cache Query Result
  9. Callback URL
  10. Connect On Open
  11. Custom Headers
  12. Custom Url Params
  13. Firewall Password
  14. Firewall Port
  15. Firewall Server
  16. Firewall Type
  17. Firewall User
  18. Format
  19. Generate Schema Files
  20. Initiate OAuth
  21. Location
  22. Logfile
  23. Max Log File Size
  24. OAuth Access Token
  25. OAuth Access Token Secret
  26. OAuth Access Token URL
  27. OAuth Authorization URL
  28. OAuth Client Id
  29. OAuth Client Secret
  30. OAuth Grant Type
  31. OAuth Params
  32. OAuth Refresh Token
  33. OAuth Refresh Token URL
  34. OAuth Request Token URL
  35. OAuth Settings Location
  36. OAuth Verifier
  37. OAuth Version
  38. Offline
  39. Other
  40. Password
  41. Pool Idle Timeout
  42. Pool Max Size
  43. Pool Wait Time
  44. Proxy Auth Scheme
  45. Proxy Auto Detect
  46. Proxy Exceptions
  47. Proxy Password
  48. Proxy Port
  49. Proxy Server
  50. Proxy SSL Type
  51. Proxy User
  52. Pseudo Columns
  53. Readonly
  54. RTK
  55. SSL Server Cert
  56. Support Enhanced SQL
  57. Tables
  58. Timeout
  59. URI
  60. Use Connection Pooling
  61. User
  62. Verbosity
  63. Views
  64. XPath

Auth Scheme

Data Type

string

Default Value

"NONE"

Remarks

Together with Password and User, this field is used to authenticate against the server. NONE is the default option. Use the following options to select your authentication scheme:

  • NTLM: Set this to use your Windows credentials for authentication.
  • BASIC: Set this to use HTTP Basic authentication.
  • DIGEST: Set this to use HTTP Digest authentication.

 

 

Auto Cache

Data Type

bool

Default Value

false

Remarks

When AutoCache is set, the driver automatically maintains a cache of your table's data in the database of your choice. With CacheQueryResult additionally set, the driver updates the cache when you execute a SELECT query and returns the live results from the REST data.

 

Explicitly Caching SELECT Results

 

CacheQueryResult is a way to query REST in real time while maintaining a cache for offline use. Set CacheQueryResult to update the cache whenever you execute a SELECT statement. When you execute a SELECT statement with AutoCache and CacheQueryResult set, the driver executes the query to the remote data and caches the results; rows that already exist are overwritten. That is, SELECT statements are used to create and refresh the cache, not to query it. Data manipulation commands are executed to the remote data as well.

To query the cached data, set the Offline property. If you need to query the cached data in an online connection, you can append #CACHE to the table name. For example:

SELECT * FROM [NorthwindOData#CACHE]

 

 

Setting the Caching Database

 

When AutoCache is set, the driver caches to a simple, file-based cache. You can configure its location or cache to a different database with the following properties:

 

 

See Also

 

 

  • CacheQueryResult: Insert or update each row returned into the corresponding table in the cache.
  • Caching: Best Practices: This section provides more examples of using AutoCache with Offline, as well as information on determining a caching strategy.
  • CacheMetadata: This property reduces the amount of metadata that crosses the network by persisting table schemas retrieved from the REST metadata. Metadata then needs to be retrieved only once instead of every connection.
  • CACHE Statements: You can use the CACHE statement to persist any SELECT query, as well as manage the cache; for example, refreshing schemas.

 

 

 

Batch Size

Data Type

int

Default Value

0

Remarks

When BatchSize is set to a value greater than 0, the batch operation will split the entire batch into separate batches of size BatchSize. The split batches will then be submitted to the server individually. This is useful when the server has limitations on the size of the request that can be submitted.

Setting BatchSize to 0 will submit the entire batch as specified.

 

Cache Connection

Data Type

string

Default Value

""

Remarks

The cache database is determined based on the CacheDriver and CacheConnection properties. Both properies are required to use the cache database. Examples of common cache database settings can be found below. For more information on setting the caching database's driver, refer to CacheDriver.

The connection string specified in the CacheConnection property is passed directly to the underlying CacheDriver. Consult the documentation for the specific JDBC driver for more information on the available properties. Make sure to include the JDBC driver in your application's classpath.

 

Derby and Java DB

 

The driver simplifies caching to Derby, only requiring you to set the CacheLocation property to make a basic connection.

Alternatively, you can configure the connection to Derby manually using CacheProvider and CacheConnection. Below is the Derby JDBC URL syntax:

jdbc:derby:[subsubprotocol:][databaseName][;attribute=value[;attribute=value] ... ]
For example, to cache to an in-memory database, use the following:
jdbc:derby:memory

 

 

SQLite

 

To cache to SQLite, you can use the SQLite JDBC driver. Below is the syntax of the JDBC URL:

jdbc:sqlite:dataSource
  • Data Source: The path to an SQLite database file. Or, use a value of :memory to cache in memory.

 

 

MySQL

 

The installation includes the CData JDBC Driver for MySQL. Below is an example JDBC URL:

jdbc:mysql:User=root;Password=root;Server=localhost;Port=3306;Database=cache
Below are typical connection properties:

 

 

  • Server: The IP address or domain name of the server you want to connect to.
  • Port: The port that the server is running on.
  • User: The username provided for authentication to the database.
  • Password: The password provided for authentication to the database.
  • Database: The name of the database.
SQL Server

 

The JDBC URL for the Microsoft JDBC Driver for SQL Server has the following syntax:

jdbc:sqlserver://[serverName[\instance][:port]][;database=databaseName][;property=value[;property=value] ... ]
For example:
jdbc:sqlserver://localhost\sqlexpress:1433;integratedSecurity=true
Below are typical SQL Server connection properties:
  • Server: The name or network address of the computer running SQL Server. To connect to a named instance instead of the default instance, this property can be used to specify the host name and the instance, separated by a backslash.
  • Port: The port SQL Server is running on.
  • Database: The name of the SQL Server database.
  • Integrated Security: Set this option to true to use the current Windows account for authentication. Set this option to false if you are setting the User and Password in the connection.

    To use integrated security, you will also need to add sqljdbc_auth.dll to a folder on the Windows system path. This file is located in the auth subfolder of the Microsoft JDBC Driver for SQL Server installation. The bitness of the assembly must match the bitness of your JVM.

  • User: The username provided for authentication with SQL Server. Only needed if you are not using integrated security.
  • Password: The password provided for authentication with SQL Server. Only needed if you are not using integrated security.
Oracle

 

Below is the conventional JDBC URL syntax for the Oracle JDBC Thin driver:

jdbc:oracle:thin:[userId/password]@[//]host[[:port][:sid]]
For example:
jdbc:oracle:thin:scott/tiger@myhost:1521:orcl
Below are typical connection properties:
  • Data Source: The connect descriptor that identifies the Oracle database. This can be a TNS connect descriptor, an Oracle Net Services name that resolves to a connect descriptor, or, after version 11g, an Easy Connect naming (the host name of the Oracle server with an optional port and service name).

  • Password: The password provided for authentication with the Oracle database.
  • User Id: The user Id provided for authentication with the Oracle database.
PostgreSQL

 

Below is the JDBC URL syntax for the official PostgreSQL JDBC driver:

jdbc:postgresql:[//[host[:port]]/]database[[?option=value][[&option=value][&option=value] ... ]]
For example, the following connection string connects to a database on the default host (localhost) and port (5432):
jdbc:postgresql:postgres
Below are typical connection properties:
  • Host: The address of the server hosting the PostgreSQL database.
  • Port: The port used to connect to the server hosting the PostgreSQL database.
  • Database: The name of the database.
  • Username: The user Id provided for authentication with the PostgreSQL database. You can specify this in the JDBC URL with the "user" parameter.
  • Password: The password provided for authentication with the PostgreSQL database.

 

 

Cache Driver

Data Type

string

Default Value

""

Remarks

You can cache to any database for which you have a JDBC driver, including CData JDBC drivers.

The cache database is determined based on the CacheDriver and CacheConnection properties. The CacheDriver is the name of the JDBC driver class that you would like to use to cache data.

Note that you must also add the CacheDriver JAR to the classpath.

The following examples show how to cache to several major databases. Refer to CacheConnection for more information on the JDBC URL syntax and typical connection properties.

Derby and Java DB

 

 

The driver simplifies Derby configuration. Java DB is the Oracle distribution of Derby. The JAR is shipped in the JDK. You can find the JAR, derby.jar, in the db subfolder of the JDK installation. In most caching scenarios, you need to specify only the following, after adding derby.jar to the classpath.

jdbc:rest:CacheLocation='c:/Temp/cachedir';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON
To customize the Derby JDBC URL, use CacheDriver and CacheConnection. For example, to cache to an in-memory database, use a JDBC URL like the following:
jdbc:rest:CacheDriver=org.apache.derby.jdbc.EmbeddedDriver;CacheConnection='jdbc:derby:memory';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON
SQLite

 

Below is a JDBC URL for the SQLite JDBC driver:

jdbc:rest:CacheDriver=org.sqlite.JDBC;CacheConnection='jdbc:sqlite:C:/Temp/sqlite.db';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON
MySQL

 

Below is a JDBC URL for the included CData JDBC Driver for MySQL:

  jdbc:rest:Cache Driver=cdata.jdbc.mysql.MySQLDriver;Cache Connection='jdbc:mysql:Server=localhost;Port=3306;Database=cache;User=root;Password=123456';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON
  
The CData JDBC Driver for MySQL is located in the lib subfolder of the CData JDBC Driver for REST 2017 installation directory.
SQL Server

 

The following JDBC URL uses the Microsoft JDBC Driver for SQL Server:

jdbc:rest:Cache Driver=com.microsoft.sqlserver.jdbc.SQLServerDriver;Cache Connection='jdbc:sqlserver://localhost\sqlexpress:7437;user=sa;password=123456;databaseName=Cache';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON
Oracle

 

Below is a JDBC URL for the Oracle Thin Client:

jdbc:rest:Cache Driver=oracle.jdbc.driver.OracleDriver;CacheConnection='jdbc:oracle:thin:scott/tiger@localhost:1521:orcldb';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON
PostgreSQL

 

The following JDBC URL uses the official PostgreSQL JDBC driver:

jdbc:rest:CacheDriver=org.postgresql.Driver;CacheConnection='jdbc:postgresql://localhost:5433/postgres?user=postgres&password=admin';GenerateSchemaFiles=OnStart;XPath=MyRepeatingElement;URI=https://MyAPI;Location=C:\\MySchemaFolder;Format=JSON

 

 

Cache Location

Data Type

string

Default Value

""

Remarks

The CacheLocation is a simple, file-based cache. The driver uses Java DB, Oracle's distribution of the Derby database. To cache to Java DB, you will need to add the Java DB JAR to the classpath. The JAR, derby.jar, is shipped in the JDK and located in the db subfolder of the JDK installation.

CacheLocation defaults to the directory specified by the Location setting.

See Also

 

 

  • AutoCache: Set this to implicitly create and maintain a cache for later offline use.
  • CacheMetadata: Set this to persist the REST catalog in CacheLocation.

 

 

Cache Metadata

Data Type

bool

Default Value

false

Remarks

-synch -port -rssis As you execute queries with this property set, table metadata in the REST catalog are cached to the file store specified by CacheLocation if set or the user's home directory otherwise. A table's metadata will be retrieved only once, when the table is queried for the first time.

When to Use CacheMetadata

 

The driver automatically persists metadata in memory for up to two hours when you first discover the metadata for a table or view and therefore, CacheMetadata is generally not required. CacheMetadata becomes useful when metadata operations are expensive such as when you are working with large amounts of metadata or when you have many short-lived connections.

When Not to Use CacheMetadata

 

 

  • When you are working with volatile metadata: Metadata for a table is only retrieved the first time the connection to the table is made. To pick up new, changed, or deleted columns, you would need to delete and rebuild the metadata cache. Therefore, it is best to rely on the in-memory caching for cases where metdata will change often.
  • When you are caching to a database: CacheMetadata can only be used with CacheLocation. If you are caching to another database with the CacheDriver and CacheConnection properties, use AutoCache to cache implicitly. Or, use CACHE Statements to cache explicitly.

 

 

Cache Query Result

Data Type

bool

Default Value

false

Remarks

When CacheQueryResult and AutoCache are set, the rows returned from a SELECT query are cached in the cache database. The driver handles caching in a streaming fashion with each row being processed into the cache database from the original result set as you read the row from the returned ResultSet object. This ensures that the live data is not queried twice. Note that any rows you do not read from the returned ResultSet will not be updated in the cache.

 

Callback URL

Data Type

string

Default Value

""

Remarks

During the authentication process, the OAuth authorization server redirects the user to this URL. This value must match the callback URL you specify in your app settings.

 

Connect On Open

Data Type

bool

Default Value

false

Remarks

When set to 'true', a connection will be made to REST when the connection is opened. This property enables the 'Test Connection' feature available in various database tools.

This feature acts as a NOOP command as it is used to verify a connection can be made to REST and nothing from this initial connection is maintained.

Setting this property to 'false' may provide performance improvements (depending upon the number of times a connection is opened).

 

Custom Headers

Data Type

string

Default Value

""

Remarks

This property can be set to a string of headers to be appended to the HTTP request headers created from other properties, like ContentType, From, etc.

The headers must be of the format "header: value" as described in the HTTP specifications. Header lines should be separated by CRLF (the carriage return and line feed characters).

Use this property with caution. If this property contains invalid headers, HTTP requests may fail.

This property is useful for fine-tuning the functionality of the driver to integrate with specialized or nonstandard APIs.

 

Custom Url Params

Data Type

string

Default Value

""

Remarks

The CustomUrlParams allow you to specify custom query string parameters that are included with the HTTP request. The parameters must be encoded as a query string in the form field1=value1&field2=value2&field3=value3, etc. The values in the query string must be URL encoded.

 

Firewall Password

Data Type

string

Default Value

""

Remarks

This property is passed to the proxy specified by FirewallServer and FirewallPort, following the authentication method specified by FirewallType.

 

Firewall Port

Data Type

string

Default Value

""

Remarks

This specifies the TCP port for a proxy allowing traversal of a firewall. Use FirewallServer to specify the name or IP address. Specify the protocol with FirewallType.

 

Firewall Server

Data Type

string

Default Value

""

Remarks

This property specifies the IP address, DNS name, or host name of a proxy allowing traversal of a firewall. The protocol is specified by FirewallType: Use FirewallServer with this property to connect through SOCKS or do tunneling. Use ProxyServer to connect to an HTTP proxy.

Note that the driver uses the system proxy by default. To use a different proxy, set ProxyAutoDetect to false.

 

Firewall Type

Data Type

string

Default Value

"NONE"

Remarks

This property specifies the protocol that the driver will use to tunnel traffic through the FirewallServer proxy. Note that by default the driver connects to the system proxy; to disable this behavior and connect to one of the following proxy types, set ProxyAutoDetect to false.

 

   
Type Default Port Description
TUNNEL 80 When this is set, the driver opens a connection to REST and traffic flows back and forth through the proxy.
SOCKS4 1080 When this is set, the driver sends data through the SOCKS 4 proxy specified by FirewallServer and FirewallPort and passes the FirewallUser value to the proxy, which determines if the connection request should be granted.
SOCKS5 1080 When this is set, the driver sends data through the SOCKS 5 proxy specified by FirewallServer and FirewallPort. If your proxy requires authentication, set FirewallUser and FirewallPassword to credentials the proxy recognizes.

 

To connect to HTTP proxies, use ProxyServer and ProxyPort. To authenticate to HTTP proxies, use ProxyAuthScheme, ProxyUser, and ProxyPassword.

 

 

Firewall User

Data Type

string

Default Value

""

Remarks

The FirewallUser and FirewallPassword properties are used to authenticate against the proxy specified in FirewallServer and FirewallPort, following the authentication method specified in FirewallType.

 

Format

Data Type

string

Default Value

"JSON"

Remarks

This property is required when using the CreateSchema stored procedure or use the Generate Schema File feature (Set GenerateSchemFiles to OnStart or OnUse)

 

Generate Schema Files

Data Type

string

Default Value

"Never"

Remarks

Available values are:

  • Never: A schema file (RSD) will never be generated.
  • OnUse: A schema file (RSD) will be generated the first time a table is referenced, provided the schema file (RSD) for the table does not already exist.
  • OnStart: A schema file (RSD) will be generated at connect time for any tables that do not currently have a schema file (RSD).

 

This property is used in conjuction with Format, URI, XPath, and Location. URI is used to specify the location of the XML document to parse and XPath is used to define the location in the XML/JSON document that will make up the rows in the table (in which the columns are determined). Location is used to specify the folder location where the schema file (RSD) will be written.

The CreateSchema stored procedure can be called directly to generate a schema file (RSD) as well.

 

Initiate OAuth

Data Type

string

Default Value

"OFF"

Remarks

The following options are available:

  1. OFF: Indicates that the OAuth flow will be handled entirely by the user. An OAuthAccessToken will be required to authenticate.
  2. GETANDREFRESH: Indicates that the entire OAuth Flow will be handled by the driver. If no token currently exists, it will be obtained by prompting the user via the browser. If a token exists, it will be refreshed when applicable.
  3. REFRESH: Indicates that the driver will only handle refreshing the OAuthAccessToken. The user will never be prompted by the driver to authenticate via the browser. The user must handle obtaining the OAuthAccessToken and OAuthRefreshToken initially.

 

 

Location

Data Type

string

Default Value

""

Remarks

The path to a directory which contains the schema files for the driver (.rsd files for tables and views, .rsb files for stored procedures). The Location property is only needed if you would like to customize definitions (e.g., change a column name, ignore a column, etc.) or extend the data model with new tables, views, or stored procedures.

The schema files are deployed alongside the driver assemblies. You must also ensure that Location points to the folder that contains the schema files. The folder location can be a relative path from the location of the executable.

 

 

Logfile

Data Type

string

Default Value

""

Remarks

For more control over what is written to the log file, take a look at Verbosity.

 

Max Log File Size

Data Type

string

Default Value

""

Remarks

A string specifying the maximum size in bytes for a log file (ex: 10MB). When the limit is hit, a new log is created in the same folder with the date and time appended to the end. There is no limit by default. Values lower than 100kB will use 100kB as the value instead.

 

OAuth Access Token

Data Type

string

Default Value

""

Remarks

The OAuthAccessToken property is used to connect using OAuth. The OAuthAccessToken is retrieved from the OAuth server as part of the authentication process. It has a server-dependent timeout and can be reused between requests.

The access token is used in place of your username and password. The access token protects your credentials by keeping them on the server.

 

OAuth Access Token Secret

Data Type

string

Default Value

""

Remarks

The OAuthAccessTokenSecret property is used to connect and authenticate using OAuth. The OAuthAccessTokenSecret is retrieved from the OAuth server as part of the authentication process. It is used with the OAuthAccessToken and can be used for multiple requests until it times out.

 

OAuth Access Token URL

Data Type

string

Default Value

""

Remarks

The URL to retrieve the OAuth access token from. In OAuth 1.0 the authorized request token is exchanged for the access token at this URL.

 

 

OAuth Authorization URL

Data Type

string

Default Value

""

Remarks

The authorization URL for the OAuth service. At this URL the user logs into the server and grants permissions to the application. In OAuth 1.0 if permissions are granted the request token is authorized.

 

OAuth Client Id

Data Type

string

Default Value

""

Remarks

As part of registering an OAuth application, you will receive the OAuthClientId value, sometimes also called a consumer key, and a client secret, the OAuthClientSecret.

 

OAuth Client Secret

Data Type

string

Default Value

""

Remarks

As part of registering an OAuth application, you will receive the OAuthClientId, also called a consumer key. You will also receive a client secret, also called a consumer secret. Set the client secret in the OAuthClientSecret property.

 

OAuth Grant Type

Data Type

string

Default Value

"CODE"

Remarks

The grant type for the OAuth flow. The following options are available: CODE,CLIENT,PASSWORD

 

 

OAuth Params

Data Type

string

Default Value

""

Remarks

A comma-separated list of other parameters to submit in the request for the OAuth access token in the format paramname=value.

 

 

OAuth Refresh Token

Data Type

string

Default Value

""

Remarks

The OAuthRefreshToken property is used to refresh the OAuthAccessToken when using OAuth authentication.

 

OAuth Refresh Token URL

Data Type

string

Default Value

""

Remarks

The URL to refresh the OAuth token from. In OAuth 2.0 this URL is where the refresh token is exchanged for a new access token when the old access token expires.

 

 

OAuth Request Token URL

Data Type

string

Default Value

""

Remarks

The URL the service provides to retrieve request tokens from. Required in OAuth 1.0. In OAuth 1.0 this is the URL where the app makes a request for the request token.

 

 

OAuth Settings Location

Data Type

string

Default Value

"%APPDATA%\\CData\\REST Data Provider\\OAuthSettings.txt"

Remarks

When InitiateOAuth is set to GETANDREFRESH or REFRESH, the driver saves OAuth values to a settings file to avoid requiring the user to manually enter OAuth connection properties. The default OAuthSettingsLocation is a settings file located in the %AppData%\CData folder.

 

OAuth Verifier

Data Type

string

Default Value

""

Remarks

The verifier code returned from the OAuth authorization URL. This can be used on systems where a browser cannot be launched such as headless systems. The verifier will only be used when InitiateOAuth is set to GETANDREFRESH. Once the OAuth settings file has been generated, the verifier can be removed from the connection properties.

 

 

OAuth Version

Data Type

string

Default Value

"Disabled"

Remarks

The version of OAuth being used. The following options are available: Disabled,1.0,2.0

 

 

Offline

Data Type

bool

Default Value

false

Remarks

When Offline is set to TRUE, all queries execute against the cache as opposed to the live data source. In this mode, certain queries like INSERT, UPDATE, DELETE, and CACHE are not allowed.

 

Other

Data Type

string

Default Value

""

Remarks

The Other property is a semicolon-separated list of name-value pairs used in connection parameters specific to a data source.

Caching Configuration

 

   
CachePartial=True Caches only a subset of columns, which you can specify in your query.
QueryPassthrough=True Passes the specified query to the cache database instead of using the SQL parser of the driver.

 

Integration and Formatting

 

   
DefaultColumnSize Sets the default length of string fields when the data source does not provide column length in the metadata. The default value is 2000.
ConvertDateTimeToGMT Whether to convert date-time values to GMT, instead of the local time of the machine.
RecordToFile=filename Records the underlying socket data transfer to the specified file.

 

 

Password

Data Type

string

Default Value

""

Remarks

 

Specifies a password for authentication when accessing remote feeds or servers.

 

 

Pool Idle Timeout

Data Type

string

Default Value

""

Remarks

The allowed idle time from when the connection is free to when the connection is released and returned to the pool. The default is 60 seconds.

 

Pool Max Size

Data Type

string

Default Value

"100"

Remarks

The maximum connections in the pool. The default is 100. To disable this property, set the property value to 0 or less.

 

Pool Wait Time

Data Type

string

Default Value

""

Remarks

The max seconds to wait for a connection to become available. If a new connection request is waiting for an available connection and exceeds this time, an error is thrown. By default, new requests wait forever for an available connection.

 

Proxy Auth Scheme

Data Type

string

Default Value

"BASIC"

Remarks

This value specifies the authentication type to use to authenticate to the HTTP proxy specified by ProxyServer and ProxyPort.

Note that the driver will use the system proxy settings by default, without further configuration needed; if you want to connect to another proxy, you will need to set ProxyAutoDetect to false, in addition to ProxyServer and ProxyPort. To authenticate, set ProxyAuthScheme and set ProxyUser and ProxyPassword, if needed.

The authentication type can be one of the following:

  • BASIC: The driver performs HTTP BASIC authentication.
  • DIGEST: The driver performs HTTP DIGEST authentication.
  • NEGOTIATE: The driver retrieves an NTLM or Kerberos token based on the applicable protocol for authentication.
  • PROPRIETARY: The driver does not generate an NTLM or Kerberos token. You must supply this token in the Authorization header of the HTTP request.
If you need to use another authentication type, such as SOCKS 5 authentication, see FirewallType.

 

 

Proxy Auto Detect

Data Type

bool

Default Value

true

Remarks

By default, the driver uses the system HTTP proxy. Set this to false if you want to connect to another proxy.

To connect to an HTTP proxy, see ProxyServer.

For other proxies, such as SOCKS or tunneling, see FirewallType.

 

Proxy Exceptions

Data Type

string

Default Value

""

Remarks

The ProxyServer will be used for all addresses, except for addresses defined in this property. Use semicolons to separate entries.

Note that the driver will use the system proxy settings by default, without further configuration needed; if you want to explicitly configure proxy exceptions for this connection, you will need to set ProxyAutoDetect to false, and configure ProxyServer and ProxyPort. To authenticate, set ProxyAuthScheme and set ProxyUser and ProxyPassword, if needed.

 

Proxy Password

Data Type

string

Default Value

""

Remarks

This property is used to authenticate to an HTTP proxy server that supports NTLM (Windows), Kerberos, or HTTP authentication. To specify the HTTP proxy, you can set ProxyServer and ProxyPort. To specify the authentication type, set ProxyAuthScheme.

If you are using HTTP authentication, additionally set ProxyUser and ProxyPassword to HTTP proxy.

If you are using NTLM authentication, set ProxyUser and ProxyPassword to your Windows password. You may also need these to complete Kerberos authentication.

For SOCKS 5 authentication or tunneling, see FirewallType.

By default, the driver uses the system proxy. If you want to connect to another proxy, set ProxyAutoDetect to false.

 

Proxy Port

Data Type

string

Default Value

"80"

Remarks

The port the HTTP proxy is running on that you want to redirect HTTP traffic through. Specify the HTTP proxy in ProxyServer. For other proxy types, see FirewallType.

 

Proxy Server

Data Type

string

Default Value

""

Remarks

The hostname or IP address of a proxy to route HTTP traffic through. The driver can use the HTTP, Windows (NTLM), or Kerberos authentication types to authenticate to an HTTP proxy.

If you need to connect through a SOCKS proxy or tunnel the connection, see FirewallType.

By default, the driver uses the system proxy. If you need to use another proxy, set ProxyAutoDetect to false.

 

Proxy SSL Type

Data Type

string

Default Value

"AUTO"

Remarks

This property determines when to use SSL for the connection to an HTTP proxy specified by ProxyServer. This value can be AUTO, ALWAYS, NEVER, or TUNNEL. The applicable values are the following:

 

   
AUTO Default setting. If the URL is an HTTPS URL, the driver will use the TUNNEL option. If the URL is an HTTP URL, the component will use the NEVER option.
ALWAYS The connection is always SSL enabled.
NEVER The connection is not SSL enabled.
TUNNEL The connection is through a tunneling proxy: The proxy server opens a connection to the remote host and traffic flows back and forth through the proxy.

 

 

Proxy User

Data Type

string

Default Value

""

Remarks

The ProxyUser and ProxyPassword options are used to connect and authenticate against the HTTP proxy specified in ProxyServer.

You can select one of the available authentication types in ProxyAuthScheme. If you are using HTTP authentication, set this to the username of a user recognized by the HTTP proxy. If you are using Windows or Kerberos authentication, set this property to a username in one of the following formats:

user@domain
domain\user

 

 

Pseudo Columns

Data Type

string

Default Value

""

Remarks

This setting is particularly helpful in Entity Framework, which does not allow you to set a value for a pseudo column unless it is a table column. The value of this connection setting is of the format "Table1=Column1, Table1=Column2, Table2=Column3". You can use the "*" character to include all tables and all columns; i.e., "*=*".

 

Readonly

Data Type

bool

Default Value

false

Remarks

If this property is set to true, the driver will allow only SELECT queries. INSERT, UPDATE, DELETE, and stored procedure queries will cause an error to be thrown.

 

RTK

Data Type

string

Default Value

""

Remarks

The RTK property may be used to license a build. Please see the included licensing file to see how to set this property. The runtime key is only available if you purchased an OEM license.

 

SSL Server Cert

Data Type

string

Default Value

""

Remarks

If using a TLS/SSL connection, this property can be used to specify the TLS/SSL certificate to be accepted from the server. Any other certificate that is not trusted by the machine will be rejected.

This property can take the forms:

 

   
Description Example
A full PEM Certificate (example shortened for brevity) -----BEGIN CERTIFICATE----- MIIChTCCAe4CAQAwDQYJKoZIhv......Qw== -----END CERTIFICATE-----
A path to a local file containing the certificate C:\cert.cer
The public key (example shortened for brevity) -----BEGIN RSA PUBLIC KEY----- MIGfMA0GCSq......AQAB -----END RSA PUBLIC KEY-----
The MD5 Thumbprint (hex values can also be either space or colon separated) ecadbdda5a1529c58a1e9e09828d70e4
The SHA1 Thumbprint (hex values can also be either space or colon separated) 34a929226ae0819f2ec14b4a3d904f801cbb150d

 

If not specified, any certificate trusted by the machine will be accepted. Use '*' to signify to accept all certificates (not recommended for security concerns).

 

Support Enhanced SQL

Data Type

bool

Default Value

true

Remarks

When SupportEnhancedSQL is set to true, the driver offloads as much of the SELECT statement processing as possible to REST and then processes the rest of the query in memory. In this way the driver can execute unsupported predicates, joins, and aggregation.

When SupportEnhancedSQL is set to false, the driver limits SQL execution to what is supported by the REST API.

Execution of Predicates

 

The driver determines which of the clauses are supported by the data source and then pushes them to the source to get the smallest superset of rows that would satisfy the query. It then filters the rest of the rows locally. The filter operation is streamed, which enables the driver to filter effectively for even very large datasets.

Execution of Joins

 

The driver uses various techniques to join in memory. The driver trades off memory utilization against the requirement of reading the same table more than once.

Execution of Aggregates

 

The driver retrieves all rows necessary to process the aggregation in memory.

 

Tables

Data Type

string

Default Value

""

Remarks

Listing the tables from some databases can be expensive. Providing a list of tables in the connection string improves the performance of the driver.

This property can also be used as an alternative to automatically listing views if you already know which ones you want to work with and there would otherwise be too many to work with.

Specify the tables you want in a comma-separated list. For example: Tables=TableA,TableB,TableC

 

Timeout

Data Type

string

Default Value

"60"

Remarks

If the Timeout property is set to 0, operations do not time out: They run until they complete successfully or encounter an error condition.

If Timeout expires and the operation is not yet complete, the driver throws an exception.

 

URI

Data Type

string

Default Value

""

Remarks

This property specifies a URI for the resource location. Can either be a XML or JSON file or an HTTP(s) URL of remote data.

 

Use Connection Pooling

Data Type

bool

Default Value

false

Remarks

Enables connection pooling. The default is false. See Connection Pooling for information on using connection pools.

 

User

Data Type

string

Default Value

""

Remarks

 

Specifies a username for authentication when accessing remote feeds or servers.

 

Verbosity

Data Type

string

Default Value

"1"

Remarks

The verbosity level determines the amount of detail that the driver reports to the Logfile. Verbosity levels from 1 to 5 are supported. These are described below:

 

   
1 Setting Verbosity to 1 will log the query, the number of rows returned by it, the start of execution and the time taken, and any errors.
2 Setting Verbosity to 2 will log everything included in Verbosity 1, cache queries, and additional information about the request, if applicable, such as HTTP headers.
3 Setting Verbosity to 3 will additionally log the body of the request and the response.
4 Setting Verbosity to 4 will additionally log transport-level communication with the data source. This includes SSL negotiation.
5 Setting Verbosity to 5 will additionally log communication with the data source and additional details that may be helpful in troubleshooting problems. This includes interface commands.

The Verbosity should not be set to greater than 1 for normal operation. Substantial amounts of data can be logged at higher verbosities, which can delay execution times.

 

Views

Data Type

string

Default Value

""

Remarks

Listing the views from some databases can be expensive. Providing a list of views in the connection string improves the performance of the driver.

This property can also be used as an alternative to automatically listing views if you already know which ones you want to work with and there would otherwise be too many to work with.

Specify the views you want in a comma-separated list. For example: For example: Views=ViewsA,ViewsB,ViewsC

 

XPath

Data Type

string

Default Value

""

Remarks

This parameter specifies the XPath of an element that has the same name as other elements at the same height. The RepeatElement is used to split the document into multiple rows.

This property will be used to generate the schema definition when a schema file (RSD) file is not present.




 

Tables

 

Views