org.apache.ignite

Class IgniteJdbcThinDriver

java.lang.Object

org.apache.ignite.IgniteJdbcThinDriver

All Implemented Interfaces:

Driver

public class IgniteJdbcThinDriver
extends Object
implements Driver

JDBC driver thin implementation for In-Memory Data Grid.

Description

Driver allows to get distributed data from Ignite cache using standard SQL queries and standard JDBC API. It will automatically get only fields that you actually need from objects stored in cache.

Limitations

Data in Ignite cache is usually distributed across several nodes, so some queries may not work as expected since the query will be sent to each individual node and results will then be collected and returned as JDBC result set. Keep in mind following limitations (not applied if data is queried from one node only, or data is fully co-located or fully replicated on multiple nodes):

• Joins will work correctly only if joined objects are stored in collocated mode. Refer to AffinityKey javadoc for more details.
• Note that if you are connected to local or replicated cache, all data will be queried only on one node, not depending on what caches participate in the query (some data from partitioned cache can be lost). And visa versa, if you are connected to partitioned cache, data from replicated caches will be duplicated.

SQL Notice

Driver allows to query data from several caches. Cache that driver is connected to is treated as default schema in this case. Other caches can be referenced by their names.\

Dependencies

JDBC driver is located in main Ignite JAR in IGNITE_HOME/libs folder.

Configuration

JDBC connection URL has the following pattern: jdbc:ignite://<hostname>:<port>/
Note the following:

• Hostname is required.
• If port is not defined, 10800 is used (default for Ignite thin client).

Other properties can be defined in Properties object passed to DriverManager.getConnection(String, Properties) method:

Name	Description	Default	Optional
ignite.jdbc.distributedJoins	Flag to enable distributed joins.	false (distributed joins are disabled)	Yes
ignite.jdbc.enforceJoinOrder	Flag to enforce join order of tables in the query.	false (enforcing join order is disabled)	Yes

Example

 // Open JDBC connection.
 Connection conn = DriverManager.getConnection("jdbc:ignite:thin//localhost:10800");

 // Query persons' names
 ResultSet rs = conn.createStatement().executeQuery("select name from Person");

 while (rs.next()) {
     String name = rs.getString(1);

     ...
 }

 // Query persons with specific age
 PreparedStatement stmt = conn.prepareStatement("select name, age from Person where age = ?");

 stmt.setInt(1, 30);

 ResultSet rs = stmt.executeQuery();

 while (rs.next()) {
     String name = rs.getString("name");
     int age = rs.getInt("age");

     ...
 }
 

Constructor Summary

Constructors

Constructor and Description
IgniteJdbcThinDriver()

Method Summary

Modifier and Type	Method and Description
boolean	acceptsURL(String url)
Connection	connect(String url, Properties props)
int	getMajorVersion()
int	getMinorVersion()
Logger	getParentLogger()
DriverPropertyInfo[]	getPropertyInfo(String url, Properties info)
boolean	jdbcCompliant()
static Driver	register()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IgniteJdbcThinDriver

public IgniteJdbcThinDriver()

Method Detail

connect

public Connection connect(String url,
                          Properties props)
                   throws SQLException

Specified by:

connect in interface Driver

Throws:

SQLException

acceptsURL

public boolean acceptsURL(String url)
                   throws SQLException

Specified by:

acceptsURL in interface Driver

Throws:

SQLException

getPropertyInfo

public DriverPropertyInfo[] getPropertyInfo(String url,
                                            Properties info)
                                     throws SQLException

Specified by:

getPropertyInfo in interface Driver

Throws:

SQLException

getMajorVersion

public int getMajorVersion()

Specified by:

getMajorVersion in interface Driver

getMinorVersion

public int getMinorVersion()

Specified by:

getMinorVersion in interface Driver

jdbcCompliant

public boolean jdbcCompliant()

Specified by:

jdbcCompliant in interface Driver

getParentLogger

public Logger getParentLogger()
                       throws SQLFeatureNotSupportedException

Specified by:

getParentLogger in interface Driver

Throws:

SQLFeatureNotSupportedException

register

public static Driver register()

Returns:

Driver instance.