SQLInput
public interface SQLInput
| java.sql.SQLInput |
An input stream that contains a stream of values representing an instance of an SQL structured type or an SQL distinct type. This interface, used only for custom mapping, is used by the driver behind the scenes, and a programmer never directly invokes SQLInput methods. The reader methods (readLong, readBytes, and so on) provide a way for an implementation of the SQLData interface to read the values in an SQLInput object. And as described in SQLData, calls to reader methods must be made in the order that their corresponding attributes appear in the SQL definition of the type. The method wasNull is used to determine whether 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 user-defined type (UDT) being custom mapped. The driver creates an instance of SQLInput, 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 SQLInput reader methods in its implementation for reading the attributes from the input stream.
Summary
Public methods | |
|---|---|
abstract Array | readArray() Reads an SQL |
abstract InputStream | readAsciiStream() Reads the next attribute in the stream and returns it as a stream of ASCII characters. |
abstract BigDecimal | readBigDecimal() Reads the next attribute in the stream and returns it as a |
abstract InputStream | readBinaryStream() Reads the next attribute in the stream and returns it as a stream of uninterpreted bytes. |
abstract Blob | readBlob() Reads an SQL |
abstract boolean | readBoolean() Reads the next attribute in the stream and returns it as a |
abstract byte | readByte() Reads the next attribute in the stream and returns it as a |
abstract byte[] | readBytes() Reads the next attribute in the stream and returns it as an array of bytes in the Java programming language. |
abstract Reader | readCharacterStream() Reads the next attribute in the stream and returns it as a stream of Unicode characters. |
abstract Clob | readClob() Reads an SQL |
abstract Date | readDate() Reads the next attribute in the stream and returns it as a |
abstract double | readDouble() Reads the next attribute in the stream and returns it as a |
abstract float | readFloat() Reads the next attribute in the stream and returns it as a |
abstract int | readInt() Reads the next attribute in the stream and returns it as an |
abstract long | readLong() Reads the next attribute in the stream and returns it as a |
abstract NClob | readNClob() Reads an SQL |
abstract String | readNString() Reads the next attribute in the stream and returns it as a |
abstract Object | readObject() Reads the datum at the head of the stream and returns it as an |
abstract Ref | readRef() Reads an SQL |
abstract RowId | readRowId() Reads an SQL |
abstract SQLXML | readSQLXML() Reads an SQL |
abstract short | readShort() Reads the next attribute in the stream and returns it as a |
abstract String | readString() Reads the next attribute in the stream and returns it as a |
abstract Time | readTime() Reads the next attribute in the stream and returns it as a |
abstract Timestamp | readTimestamp() Reads the next attribute in the stream and returns it as a |
abstract URL | readURL() Reads an SQL |
abstract boolean | wasNull() Retrieves whether the last value read was SQL |
Public methods
readArray
public abstract Array readArray ()
Reads an SQL ARRAY value from the stream and returns it as an Array object in the Java programming language.
| Returns | |
|---|---|
Array | an Array object representing data of the SQL ARRAY value at the head of the stream; null if the value read is SQL NULL |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readAsciiStream
public abstract InputStream readAsciiStream ()
Reads the next attribute in the stream and returns it as a stream of ASCII characters.
| Returns | |
|---|---|
InputStream | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readBigDecimal
public abstract BigDecimal readBigDecimal ()
Reads the next attribute in the stream and returns it as a java.math.BigDecimal object in the Java programming language.
| Returns | |
|---|---|
BigDecimal | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readBinaryStream
public abstract InputStream readBinaryStream ()
Reads the next attribute in the stream and returns it as a stream of uninterpreted bytes.
| Returns | |
|---|---|
InputStream | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readBlob
public abstract Blob readBlob ()
Reads an SQL BLOB value from the stream and returns it as a Blob object in the Java programming language.
| Returns | |
|---|---|
Blob | a Blob object representing data of the SQL BLOB value at the head of the stream; null if the value read is SQL NULL |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readBoolean
public abstract boolean readBoolean ()
Reads the next attribute in the stream and returns it as a boolean in the Java programming language.
| Returns | |
|---|---|
boolean | the attribute; if the value is SQL NULL, returns false |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readByte
public abstract byte readByte ()
Reads the next attribute in the stream and returns it as a byte in the Java programming language.
| Returns | |
|---|---|
byte | the attribute; if the value is SQL NULL, returns 0 |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readBytes
public abstract byte[] readBytes ()
Reads the next attribute in the stream and returns it as an array of bytes in the Java programming language.
| Returns | |
|---|---|
byte[] | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readCharacterStream
public abstract Reader readCharacterStream ()
Reads the next attribute in the stream and returns it as a stream of Unicode characters.
| Returns | |
|---|---|
Reader | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readClob
public abstract Clob readClob ()
Reads an SQL CLOB value from the stream and returns it as a Clob object in the Java programming language.
| Returns | |
|---|---|
Clob | a Clob object representing data of the SQL CLOB value at the head of the stream; null if the value read is SQL NULL |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readDate
public abstract Date readDate ()
Reads the next attribute in the stream and returns it as a java.sql.Date object.
| Returns | |
|---|---|
Date | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readDouble
public abstract double readDouble ()
Reads the next attribute in the stream and returns it as a double in the Java programming language.
| Returns | |
|---|---|
double | the attribute; if the value is SQL NULL, returns 0 |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readFloat
public abstract float readFloat ()
Reads the next attribute in the stream and returns it as a float in the Java programming language.
| Returns | |
|---|---|
float | the attribute; if the value is SQL NULL, returns 0 |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readInt
public abstract int readInt ()
Reads the next attribute in the stream and returns it as an int in the Java programming language.
| Returns | |
|---|---|
int | the attribute; if the value is SQL NULL, returns 0 |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readLong
public abstract long readLong ()
Reads the next attribute in the stream and returns it as a long in the Java programming language.
| Returns | |
|---|---|
long | the attribute; if the value is SQL NULL, returns 0 |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readNClob
public abstract NClob readNClob ()
Reads an SQL NCLOB value from the stream and returns it as a NClob object in the Java programming language.
| Returns | |
|---|---|
NClob | 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 |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readNString
public abstract String readNString ()
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.
| Returns | |
|---|---|
String | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readObject
public abstract Object readObject ()
Reads the datum at the head of the stream and returns it as an Object in the Java programming language. The actual type of the object returned is determined by the default type mapping, and any customizations present in this stream's type map.
A type map is registered with the stream by the JDBC driver before the stream is passed to the application.
When the datum at the head of the stream is an SQL NULL, the method returns null. If the datum is an SQL structured or distinct type, it determines the SQL type of the datum at the head of the stream. If the stream's type map has an entry for that SQL type, the driver constructs an object of the appropriate class and calls the method SQLData.readSQL on that object, which reads additional data from the stream, using the protocol described for that method.
| Returns | |
|---|---|
Object | the datum at the head of the stream as an Object in the Java programming language;null if the datum is SQL NULL |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readRef
public abstract Ref readRef ()
Reads an SQL REF value from the stream and returns it as a Ref object in the Java programming language.
| Returns | |
|---|---|
Ref | a Ref object representing the SQL REF value at the head of the stream; null if the value read is SQL NULL |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readRowId
public abstract RowId readRowId ()
Reads an SQL ROWID value from the stream and returns it as a RowId object in the Java programming language.
| Returns | |
|---|---|
RowId | 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 |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readSQLXML
public abstract SQLXML readSQLXML ()
Reads an SQL XML value from the stream and returns it as a SQLXML object in the Java programming language.
| Returns | |
|---|---|
SQLXML | 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 |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readShort
public abstract short readShort ()
Reads the next attribute in the stream and returns it as a short in the Java programming language.
| Returns | |
|---|---|
short | the attribute; if the value is SQL NULL, returns 0 |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readString
public abstract String readString ()
Reads the next attribute in the stream and returns it as a String in the Java programming language.
| Returns | |
|---|---|
String | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readTime
public abstract Time readTime ()
Reads the next attribute in the stream and returns it as a java.sql.Time object.
| Returns | |
|---|---|
Time | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readTimestamp
public abstract Timestamp readTimestamp ()
Reads the next attribute in the stream and returns it as a java.sql.Timestamp object.
| Returns | |
|---|---|
Timestamp | the attribute; if the value is SQL NULL, returns null |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
readURL
public abstract URL readURL ()
Reads an SQL DATALINK value from the stream and returns it as a java.net.URL object in the Java programming language.
| Returns | |
|---|---|
URL | a java.net.URL object. |
| Throws | |
|---|---|
SQLException | if a database access error occurs, or if a URL is malformed |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |
wasNull
public abstract boolean wasNull ()
Retrieves whether the last value read was SQL NULL.
| Returns | |
|---|---|
boolean | true if the most recently read SQL value was SQL NULL; false otherwise |
| Throws | |
|---|---|
SQLException | if a database access error occurs |
SQLFeatureNotSupportedException | if the JDBC driver does not support this method |