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Chapter 3. Data Types
3.1. Supported Types
JBoss Data Virtualization supports a core set of runtime types. Runtime types can be different from semantic types defined in type fields at design time. The runtime type can also be specified at design time or it will be automatically chosen as the closest base type to the semantic type.
Note
Even if a type is declared with a length, precision, or scale argument, these restrictions are effectively ignored by the runtime system, but may be enforced by OData, ODBC or JDBC.
| Type | Description | Java Runtime Class | JDBC Type | ODBC Type |
|---|---|---|---|---|
| string or varchar | variable length character string with a maximum length of 4000. Note that the length cannot be explicitly set with the type declaration, e.g. varchar(100) is invalid. | java.lang.String | VARCHAR | VARCHAR |
| varbinary | variable length binary string with a maximum length of 8192. Note that the length cannot be explicitly set with the type declaration, e.g. varbinary(100) is invalid. | byte[] [a] | VARBINARY | VARBINARY |
| char | a single Unicode character | java.lang.Character | CHAR | CHAR |
| boolean | a single bit, or Boolean, that can be true, false, or null (unknown) | java.lang.Boolean | BIT | SMALLINT |
| byte or tinyint | numeric, integral type, signed 8-bit | java.lang.Byte | TINYINT | SMALLINT |
| short or smallint | numeric, integral type, signed 16-bit | java.lang.Short | SMALLINT | SMALLINT |
| integer or serial | numeric, integral type, signed 32-bit. The serial type also implies not null and has an auto-incrementing value that starts at 1. Serial types are not automatically UNIQUE. | java.lang.Integer | INTEGER | INTEGER |
| long or bigint | numeric, integral type, signed 64-bit | java.lang.Long | BIGINT | NUMERIC |
| biginteger | numeric, integral type, arbitrary precision of up to 1000 digits | java.math.BigInteger | NUMERIC | NUMERIC |
| float or real | numeric, floating point type, 32-bit IEEE 754 floating-point numbers | java.lang.Float | REAL | FLOAT |
| double | numeric, floating point type, 64-bit IEEE 754 floating-point numbers | java.lang.Double | DOUBLE | DOUBLE |
| bigdecimal or decimal | numeric, floating point type, arbitrary precision of up to 1000 digits. Note that the precision and scale cannot be explicitly set with the type literal, e.g. decimal(38, 2). | java.math.BigDecimal | NUMERIC | NUMERIC |
| date | datetime, representing a single day (year, month, day) | java.sql.Date | DATE | DATE |
| time | datetime, representing a single time (hours, minutes, seconds, milliseconds) | java.sql.Time | TIME | TIME |
| timestamp | datetime, representing a single date and time (year, month, day, hours, minutes, seconds, milliseconds, nanoseconds) | java.sql.Timestamp | TIMESTAMP | TIMESTAMP |
| object | any arbitrary Java object, must implement java.lang.Serializable | Any | JAVA_OBJECT | VARCHAR |
| blob | binary large object, representing a stream of bytes | java.sql.Blob [b] | BLOB | VARCHAR |
| clob | character large object, representing a stream of characters | java.sql.Clob [c] | CLOB | VARCHAR |
| xml | XML document | java.sql.SQLXML [d] | JAVA_OBJECT | VARCHAR |
| geometry | Geospatial Object | java.sql.Blob [e] | BLOB | BLOB |
[a]
The runtime type is org.teiid.core.types.BinaryType. Translators will need to explicitly handle BinaryType values. UDFs will instead have a byte[] value passed.
[b]
The concrete type is expected to be org.teiid.core.types.BlobType
[c]
The concrete type is expected to be org.teiid.core.types.ClobType
[d]
The concrete type is expected to be org.teiid.core.types.XMLType
[e]
The concrete type is expected to be org.teiid.core.types.GeometryType
| ||||
Red Hat JBoss Data Virtualization also supports arrays. Designate an array by adding
[] to the type declaration for each array dimension.
string[] integer[][]
Note
This feature is limited at present.
Important
Red Hat JBoss Data Virtualization normally handles arrays in memory. Red Hat advises you not to reply on large array values. Also arrays of lobs are not not handled correctly when serialized.
