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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.sql

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Java Document (Java Doc)

java.sql .SQLInput

SQLInput

public interface SQLInput (Code)

The SQLInput interface defines operations which apply to a type of input stream which carries a series of values which represent an instance of an SQL structured type or SQL distinct type.

SQLInput interface is used for custom mapping of SQL User Defined Types (UDTs)to Java classes. It is used by JDBC drivers below the level of the public interfaces and application programs do not normally use the SQLInput methods directly. Reader methods such as readLong and readBytes provide means to read values from an SQLInput stream.

When the getObject method is called with an object which implements the SQLData interface, the JDBC driver determines the SQL type of the UDT being mapped by calling the SQLData.getSQLType method. The driver creates an instance of an SQLInput stream, filling the stream with the attributes of the UDT. The SQLInput stream is passed to the SQLData.readSQL method which then calls the SQLInput reader methods to read the attributes.

Method Summary
public Array	readArray() Returns the next attribute in the stream in the form of a java.sql.Array. the next attribute as an Array.
public InputStream	readAsciiStream() Returns the next attribute in the stream in the form of an ASCII character stream embodied as a java.io.InputStream. the next attribute as a java.io.InputStream.
public BigDecimal	readBigDecimal() Returns the next attribute in the stream in the form of a java.math.BigDecimal. the attribute as a java.math.BigDecimal.
public InputStream	readBinaryStream() Returns the next attribute in the stream in the form of a stream of bytes embodied as a java.io.InputStream. the next attribute as a java.io.InputStream.
public Blob	readBlob() Returns the next attribute in the stream in the form of a java.sql.Blob. the next attribute as a java.sql.Blob.
public boolean	readBoolean() Returns the next attribute in the stream in the form of a boolean. the next attribute as a boolean.
public byte	readByte() Returns the next attribute in the stream in the form of a byte. the next attribute as a byte.
public byte[]	readBytes() Returns the next attribute in the stream in the form of a byte array. the attribute as a byte array.
public Reader	readCharacterStream() Returns the next attribute in the stream in the form of a Unicode character stream embodied as a java.io.Reader. the next attribute as a java.io.Reader.
public Clob	readClob() Returns the next attribute in the stream in the form of a java.sql.Clob. the next attribute as a java.sql.Clob.
public Date	readDate() Returns the next attribute in the stream in the form of a java.sql.Date. the next attribute as a java.sql.Date.
public double	readDouble() Returns the next attribute in the stream in the form of a double. the next attribute as a double.
public float	readFloat() Returns the next attribute in the stream in the form of a float. the next attribute as a float.
public int	readInt() Returns the next attribute in the stream in the form of an int. the next attribute as an int.
public long	readLong() Returns the next attribute in the stream in the form of a long. the next attribute as a long.
public Object	readObject() Returns the next attribute in the stream in the form of a java.lang.Object. The type of the Object returned is determined by the type mapping for this JDBC driver, including any customized mappings in force.
public Ref	readRef() Returns the next attribute in the stream in the form of a java.sql.Ref. the next attribute as a java.sql.Ref.
public short	readShort() Returns the next attribute in the stream in the form of a short. the next attribute as a short.
public String	readString() Returns the next attribute in the stream in the form of a String. the next attribute as a String.
public Time	readTime() Returns the next attribute in the stream in the form of a java.sql.Time. the attribute as a java.sql.Time.
public Timestamp	readTimestamp() Returns the next attribute in the stream in the form of a java.sql.Timestamp. the attribute as a java.sql.Timestamp.
public URL	readURL() Reads the next attribute in the stream (SQL DATALINK value) and returns it as a java.net.URL object. the next attribute as a java.net.URL.
public boolean	wasNull() Reports whether the last value read was SQL NULL.

Method Detail

readArray
public Array readArray() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Array. the next attribute as an Array. null if the value is SQL NULL. throws: SQLException - if there is a database error

readAsciiStream
public InputStream readAsciiStream() throws SQLException(Code)
	Returns the next attribute in the stream in the form of an ASCII character stream embodied as a java.io.InputStream. the next attribute as a java.io.InputStream. null if the value isSQL NULL. throws: SQLException - if there is a database error

readBigDecimal
public BigDecimal readBigDecimal() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.math.BigDecimal. the attribute as a java.math.BigDecimal. null if the read returnsSQL NULL. throws: SQLException - if there is a database error

readBinaryStream
public InputStream readBinaryStream() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a stream of bytes embodied as a java.io.InputStream. the next attribute as a java.io.InputStream. null if the value isSQL NULL. throws: SQLException - if there is a database error

readBlob
public Blob readBlob() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Blob. the next attribute as a java.sql.Blob. null if the value is SQLNULL. throws: SQLException - if there is a database error

readBoolean
public boolean readBoolean() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a boolean. the next attribute as a boolean. false if the value is SQL NULL. throws: SQLException - if there is a database error

readByte
public byte readByte() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a byte. the next attribute as a byte. 0 if the value is SQL NULL. throws: SQLException - if there is a database error

readBytes
public byte[] readBytes() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a byte array. the attribute as a byte array. null if the read returns SQL NULL. throws: SQLException - if there is a database error

readCharacterStream
public Reader readCharacterStream() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a Unicode character stream embodied as a java.io.Reader. the next attribute as a java.io.Reader. null if the value is SQLNULL. throws: SQLException - if there is a database error

readClob
public Clob readClob() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Clob. the next attribute as a java.sql.Clob. null if the value is SQLNULL. throws: SQLException - if there is a database error

readDate
public Date readDate() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Date. the next attribute as a java.sql.Date. null if the value is SQLNULL. throws: SQLException - if there is a database error

readDouble
public double readDouble() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a double. the next attribute as a double. 0 if the value is SQL NULL. throws: SQLException - if there is a database error

readFloat
public float readFloat() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a float. the next attribute as a float. 0 if the value is SQL NULL. throws: SQLException - if there is a database error

readInt
public int readInt() throws SQLException(Code)
	Returns the next attribute in the stream in the form of an int. the next attribute as an int. 0 if the value is SQL NULL. throws: SQLException - if there is a database error

readLong
public long readLong() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a long. the next attribute as a long. 0 if the value is SQL NULL. throws: SQLException - if there is a database error

readObject

public Object readObject() throws SQLException(Code)

Returns the next attribute in the stream in the form of a java.lang.Object.

The type of the Object returned is determined by the type mapping for this JDBC driver, including any customized mappings in force. A type map is given to the SQLInput by the JDBC driver before the SQLInput is given to the application.

If the attribute is an SQL structured or distinct type, its SQL type is determined. If the streams type map contains an element for that SQL type, the driver creates an object of relevant type and invokes the method SQLData.readSQL on it, which reads supplementary data from the stream using whichever protocol is defined for that method. the next attribute as an Object. null if the value is SQL NULL.
throws:
SQLException - if there is a database error

readRef
public Ref readRef() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Ref. the next attribute as a java.sql.Ref. null if the value is SQLNULL. throws: SQLException - if there is a database error

readShort
public short readShort() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a short. the next attribute as a short. 0 if the value is SQL NULL. throws: SQLException - if there is a database error

readString
public String readString() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a String. the next attribute as a String. null if the value is SQL NULL. throws: SQLException - if there is a database error

readTime
public Time readTime() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Time. the attribute as a java.sql.Time. null if the read returns SQLNULL. throws: SQLException - if there is a database error

readTimestamp
public Timestamp readTimestamp() throws SQLException(Code)
	Returns the next attribute in the stream in the form of a java.sql.Timestamp. the attribute as a java.sql.Timestamp. null if the read returnsSQL NULL. throws: SQLException - if there is a database error

readURL
public URL readURL() throws SQLException(Code)
	Reads the next attribute in the stream (SQL DATALINK value) and returns it as a java.net.URL object. the next attribute as a java.net.URL. null if the value is SQLNULL. throws: SQLException - if there is a database error

wasNull
public boolean wasNull() throws SQLException(Code)
	Reports whether the last value read was SQL NULL. true if the last value read was SQL NULL, false otherwise. throws: SQLException - if there is a database error

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