SQLInputImpl (Java Platform SE 8 )

java.lang.Object
- javax.sql.rowset.serial.SQLInputImpl

All Implemented Interfaces:

SQLInput
```
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.

Since:

1.5

See Also:

SQLData

Constructor Summary

Constructors
Constructor	Description
`SQLInputImpl(Object[] attributes, Map<String,Class<?>> map)`	Creates an `SQLInputImpl` object initialized with the given array of attributes and the given type map.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Array`	`readArray()`	Reads an SQL `ARRAY` value from the stream and returns it as an `Array` object in the Java programming language.
`InputStream`	`readAsciiStream()`	Returns the next attribute in this `SQLInputImpl` object as a stream of ASCII characters.
`BigDecimal`	`readBigDecimal()`	Retrieves the next attribute in this `SQLInputImpl` object as a `java.math.BigDecimal`.
`InputStream`	`readBinaryStream()`	Returns the next attribute in this `SQLInputImpl` object as a stream of uninterpreted bytes.
`Blob`	`readBlob()`	Retrieves the `BLOB` value at the head of this `SQLInputImpl` object as a `Blob` object in the Java programming language.
`boolean`	`readBoolean()`	Retrieves the next attribute in this `SQLInputImpl` object as a `boolean` in the Java programming language.
`byte`	`readByte()`	Retrieves the next attribute in this `SQLInputImpl` object as a `byte` in the Java programming language.
`byte[]`	`readBytes()`	Retrieves the next attribute in this `SQLInputImpl` object as an array of bytes.
`Reader`	`readCharacterStream()`	Retrieves the next attribute in this `SQLInputImpl` object as a stream of Unicode characters.
`Clob`	`readClob()`	Retrieves the `CLOB` value at the head of this `SQLInputImpl` object as a `Clob` object in the Java programming language.
`Date`	`readDate()`	Retrieves the next attribute in this `SQLInputImpl` as a `java.sql.Date` object.
`double`	`readDouble()`	Retrieves the next attribute in this `SQLInputImpl` object as a `double` in the Java programming language.
`float`	`readFloat()`	Retrieves the next attribute in this `SQLInputImpl` object as a `float` in the Java programming language.
`int`	`readInt()`	Retrieves the next attribute in this `SQLInputImpl` object as an `int` in the Java programming language.
`long`	`readLong()`	Retrieves the next attribute in this `SQLInputImpl` object as a `long` in the Java programming language.
`NClob`	`readNClob()`	Reads an SQL `NCLOB` value from the stream and returns it as a `Clob` object in the Java programming language.
`String`	`readNString()`	Reads the next attribute in the stream and returns it as a `String` in the Java programming language.
`Object`	`readObject()`	Retrieves the value at the head of this `SQLInputImpl` object as an `Object` in the Java programming language.
`Ref`	`readRef()`	Retrieves the value at the head of this `SQLInputImpl` object as a `Ref` object in the Java programming language.
`RowId`	`readRowId()`	Reads an SQL `ROWID` value from the stream and returns it as a `RowId` object in the Java programming language.
`short`	`readShort()`	Retrieves the next attribute in this `SQLInputImpl` object as a `short` in the Java programming language.
`SQLXML`	`readSQLXML()`	Reads an SQL `XML` value from the stream and returns it as a `SQLXML` object in the Java programming language.
`String`	`readString()`	Retrieves the next attribute in this `SQLInputImpl` object as a `String` in the Java programming language.
`Time`	`readTime()`	Retrieves the next attribute in this `SQLInputImpl` object as a `java.sql.Time` object.
`Timestamp`	`readTimestamp()`	Retrieves the next attribute in this `SQLInputImpl` object as a `java.sql.Timestamp` object.
`URL`	`readURL()`	Reads an SQL `DATALINK` value from the stream and returns it as an `URL` object in the Java programming language.
`boolean`	`wasNull()`	Ascertains whether the last value read from this `SQLInputImpl` object was `null`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.sql.SQLInput
readObject

- Constructor Detail
  - SQLInputImpl
```
public 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.
    
    Parameters:
    
    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 mapped
    
    Throws:
    
    SQLException - if the attributes or the map is a null value
- Method Detail
  - readString
```
public 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.
    
    Specified by:
    
    readString in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no further values in the stream.
  - readBoolean
```
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.
    
    Specified by:
    
    readBoolean in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no further values in the stream.
  - readByte
```
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.
    
    Specified by:
    
    readByte in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no further values in the stream
  - readShort
```
public 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.
    
    Specified by:
    
    readShort in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readInt
```
public 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.
    
    Specified by:
    
    readInt in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readLong
```
public 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.
    
    Specified by:
    
    readLong in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readFloat
```
public 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.
    
    Specified by:
    
    readFloat in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readDouble
```
public 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.
    
    Specified by:
    
    readDouble in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readBigDecimal
```
public 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.
    
    Specified by:
    
    readBigDecimal in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readBytes
```
public 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.
    
    Specified by:
    
    readBytes in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readDate
```
public 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.
    
    Specified by:
    
    readDate in interface SQLInput
    
    Returns:
    
    the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position or if there are no more values in the stream
  - readTime
```
public 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.
    
    Specified by:
    
    readTime in interface SQLInput
    
    Returns:
    
    the attribute; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readTimestamp
```
public Timestamp readTimestamp()
                        throws SQLException
```
    Retrieves the next attribute in this SQLInputImpl object as a java.sql.Timestamp object.
    
    Specified by:
    
    readTimestamp in interface SQLInput
    
    Returns:
    
    the attribute; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readCharacterStream
```
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.
    
    Specified by:
    
    readCharacterStream in interface SQLInput
    
    Returns:
    
    the attribute; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readAsciiStream
```
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.
    
    Specified by:
    
    readAsciiStream in interface SQLInput
    
    Returns:
    
    the attribute; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readBinaryStream
```
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.
    
    Specified by:
    
    readBinaryStream in interface SQLInput
    
    Returns:
    
    the attribute; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readObject
```
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.
    
    Specified by:
    
    readObject in interface SQLInput
    
    Returns:
    
    the value at the head of the stream as an Object in the Java programming language; null if the value is SQL NULL
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readRef
```
public Ref readRef()
            throws SQLException
```
    Retrieves the value at the head of this SQLInputImpl object as a Ref object in the Java programming language.
    
    Specified by:
    
    readRef in interface SQLInput
    
    Returns:
    
    a Ref object representing the SQL REF value at the head of the stream; if the value is SQL NULL return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readBlob
```
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.
    
    Specified by:
    
    readBlob in interface SQLInput
    
    Returns:
    
    a Blob object representing the SQL BLOB value at the head of this stream; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readClob
```
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.
    
    Specified by:
    
    readClob in interface SQLInput
    
    Returns:
    
    a Clob object representing the SQL CLOB value at the head of the stream; if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readArray
```
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.
    
    Specified by:
    
    readArray in interface SQLInput
    
    Returns:
    
    an Array object representing the SQL ARRAY value at the head of the stream; * if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - wasNull
```
public boolean wasNull()
                throws SQLException
```
    Ascertains whether the last value read from this SQLInputImpl object was null.
    
    Specified by:
    
    wasNull in interface SQLInput
    
    Returns:
    
    true if the SQL value read most recently was null; otherwise, false; by default it will return false
    
    Throws:
    
    SQLException - if an error occurs determining the last value read was a null value or not;
  - readURL
```
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.
    
    Specified by:
    
    readURL in interface SQLInput
    
    Returns:
    
    an URL object representing the SQL DATALINK value at the head of the stream; * if the value is SQL NULL, return null
    
    Throws:
    
    SQLException - if the read position is located at an invalid position; or if there are no further values in the stream.
  - readNClob
```
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.
    
    Specified by:
    
    readNClob in interface SQLInput
    
    Returns:
    
    a NClob object representing data of the SQL NCLOB value at the head of the stream; null if the value read is SQL NULL
    
    Throws:
    
    SQLException - if a database access error occurs
    
    Since:
    
    1.6
  - readNString
```
public 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.
    
    Specified by:
    
    readNString in interface SQLInput
    
    Returns:
    
    the attribute; if the value is SQL NULL, returns null
    
    Throws:
    
    SQLException - if a database access error occurs
    
    Since:
    
    1.6
  - readSQLXML
```
public SQLXML readSQLXML()
                  throws SQLException
```
    Reads an SQL XML value from the stream and returns it as a SQLXML object in the Java programming language.
    
    Specified by:
    
    readSQLXML in interface SQLInput
    
    Returns:
    
    a SQLXML object representing data of the SQL XML value at the head of the stream; null if the value read is SQL NULL
    
    Throws:
    
    SQLException - if a database access error occurs
    
    Since:
    
    1.6
  - readRowId
```
public RowId readRowId()
                throws SQLException
```
    Reads an SQL ROWID value from the stream and returns it as a RowId object in the Java programming language.
    
    Specified by:
    
    readRowId in interface SQLInput
    
    Returns:
    
    a RowId object representing data of the SQL ROWID value at the head of the stream; null if the value read is SQL NULL
    
    Throws:
    
    SQLException - if a database access error occurs
    
    Since:
    
    1.6

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2025, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

Class SQLInputImpl

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.sql.SQLInput

Constructor Detail

SQLInputImpl

Method Detail

readString

readBoolean

readByte

readShort

readInt

readLong

readFloat

readDouble

readBigDecimal

readBytes

readDate

readTime

readTimestamp

readCharacterStream

readAsciiStream

readBinaryStream

readObject

readRef

readBlob

readClob

readArray

wasNull

readURL

readNClob

readNString

readSQLXML

readRowId