public class SQLInputImpl extends Object implements SQLInput
An input stream used for custom mapping user-defined types (UDTs). An SQLInputImpl object is an input stream that contains a stream of values that are the attributes of a UDT.
This class is used by the driver behind the scenes when the method getObject is called on an SQL structured or distinct type that has a custom mapping; a programmer never invokes SQLInputImpl methods directly. They are provided here as a convenience for those who write RowSet implementations.
The SQLInputImpl class provides a set of reader methods analogous to the ResultSet getter methods. These methods make it possible to read the values in an SQLInputImpl object.
The method wasNull is used to determine whether the the last value read was SQL NULL.
When the method getObject is called with an object of a class implementing the interface SQLData, the JDBC driver calls the method SQLData.getSQLType to determine the SQL type of the UDT being custom mapped. The driver creates an instance of SQLInputImpl, populating it with the attributes of the UDT. The driver then passes the input stream to the method SQLData.readSQL, which in turn calls the SQLInputImpl reader methods to read the attributes from the input stream.
SQLDatapublic SQLInputImpl(Object[] attributes,
Map<String,Class<?>> map)
throws SQLException Creates an SQLInputImpl object initialized with the given array of attributes and the given type map. If any of the attributes is a UDT whose name is in an entry in the type map, the attribute will be mapped according to the corresponding SQLData implementation.
attributes - an array of Object instances in which each element is an attribute of a UDT. The order of the attributes in the array is the same order in which the attributes were defined in the UDT definition.map - a java.util.Map object containing zero or more entries, with each entry consisting of 1) a String giving the fully qualified name of the UDT and 2) the Class object for the SQLData implementation that defines how the UDT is to be mappedSQLException - if the attributes or the map is a null valuepublic String readString()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a String in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readString in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no further values in the stream.public boolean readBoolean()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a boolean in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readBoolean in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no further values in the stream.public byte readByte()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a byte in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readByte in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no further values in the streampublic short readShort()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a short in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readShort in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic int readInt()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as an int in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readInt in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic long readLong()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a long in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readLong in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic float readFloat()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a float in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readFloat in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic double readDouble()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a double in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readDouble in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic BigDecimal readBigDecimal()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a java.math.BigDecimal.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readBigDecimal in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic byte[] readBytes()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as an array of bytes.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readBytes in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic Date readDate()
throws SQLException Retrieves the next attribute in this SQLInputImpl as a java.sql.Date object.
This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation.
readDate in interface SQLInput
SQLInputImpl object; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position or if there are no more values in the streampublic Time readTime()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a java.sql.Time object.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readTime in interface SQLInput
SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Timestamp readTimestamp()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a java.sql.Timestamp object.
readTimestamp in interface SQLInput
SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Reader readCharacterStream()
throws SQLException Retrieves the next attribute in this SQLInputImpl object as a stream of Unicode characters.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readCharacterStream in interface SQLInput
SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public InputStream readAsciiStream()
throws SQLException Returns the next attribute in this SQLInputImpl object as a stream of ASCII characters.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readAsciiStream in interface SQLInput
SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public InputStream readBinaryStream()
throws SQLException Returns the next attribute in this SQLInputImpl object as a stream of uninterpreted bytes.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readBinaryStream in interface SQLInput
SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Object readObject()
throws SQLException Retrieves the value at the head of this SQLInputImpl object as an Object in the Java programming language. The actual type of the object returned is determined by the default mapping of SQL types to types in the Java programming language unless there is a custom mapping, in which case the type of the object returned is determined by this stream's type map.
The JDBC technology-enabled driver registers a type map with the stream before passing the stream to the application.
When the datum at the head of the stream is an SQL NULL, this method returns null. If the datum is an SQL structured or distinct type with a custom mapping, this method determines the SQL type of the datum at the head of the stream, constructs an object of the appropriate class, and calls the method SQLData.readSQL on that object. The readSQL method then calls the appropriate SQLInputImpl.readXXX methods to retrieve the attribute values from the stream.
readObject in interface SQLInput
Object in the Java programming language; null if the value is SQL NULL
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Ref readRef()
throws SQLException Retrieves the value at the head of this SQLInputImpl object as a Ref object in the Java programming language.
readRef in interface SQLInput
Ref object representing the SQL REF value at the head of the stream; if the value is SQL NULL return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Blob readBlob()
throws SQLException Retrieves the BLOB value at the head of this SQLInputImpl object as a Blob object in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readBlob in interface SQLInput
Blob object representing the SQL BLOB value at the head of this stream; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Clob readClob()
throws SQLException Retrieves the CLOB value at the head of this SQLInputImpl object as a Clob object in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readClob in interface SQLInput
Clob object representing the SQL CLOB value at the head of the stream; if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public Array readArray()
throws SQLException Reads an SQL ARRAY value from the stream and returns it as an Array object in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readArray in interface SQLInput
Array object representing the SQL ARRAY value at the head of the stream; * if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public boolean wasNull()
throws SQLException Ascertains whether the last value read from this SQLInputImpl object was null.
wasNull in interface SQLInput
true if the SQL value read most recently was null; otherwise, false; by default it will return falseSQLException - if an error occurs determining the last value read was a null value or not;public URL readURL()
throws SQLException Reads an SQL DATALINK value from the stream and returns it as an URL object in the Java programming language.
This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
readURL in interface SQLInput
URL object representing the SQL DATALINK value at the head of the stream; * if the value is SQL NULL, return null
SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.public NClob readNClob()
throws SQLException Reads an SQL NCLOB value from the stream and returns it as a Clob object in the Java programming language.
readNClob in interface SQLInput
NClob object representing data of the SQL NCLOB value at the head of the stream; null if the value read is SQL NULL
SQLException - if a database access error occurspublic String readNString()
throws SQLException Reads the next attribute in the stream and returns it as a String in the Java programming language. It is intended for use when accessing NCHAR,NVARCHAR and LONGNVARCHAR columns.
readNString in interface SQLInput
NULL, returns null
SQLException - if a database access error occurspublic SQLXML readSQLXML()
throws SQLException Reads an SQL XML value from the stream and returns it as a SQLXML object in the Java programming language.
readSQLXML in interface SQLInput
SQLXML object representing data of the SQL XML value at the head of the stream; null if the value read is SQL NULL
SQLException - if a database access error occurspublic RowId readRowId()
throws SQLException Reads an SQL ROWID value from the stream and returns it as a RowId object in the Java programming language.
readRowId in interface SQLInput
RowId object representing data of the SQL ROWID value at the head of the stream; null if the value read is SQL NULL
SQLException - if a database access error occurs
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