1. 首页
  2. JavaAPI

Java compact3 javax.sql.rowset.serial Class SerialArray（JDK8）

162 阅读 0 评论

Skip navigation links
Java™ Platform
Standard Ed. 8
compact3
javax.sql.rowset.serial

Class SerialArray

  • All Implemented Interfaces:
    Serializable, Cloneable, Array 

    public class SerialArray
extends Object
implements Array, Serializable, Cloneable
    A serialized version of an Array object, which is the mapping in the Java programming language of an SQL ARRAY value.

    The SerialArray class provides a constructor for creating a SerialArray instance from an Array object, methods for getting the base type and the SQL name for the base type, and methods for copying all or part of a SerialArray object.

    Note: In order for this class to function correctly, a connection to the data source must be available in order for the SQL Array object to be materialized (have all of its elements brought to the client server) if necessary. At this time, logical pointers to the data in the data source, such as locators, are not currently supported.

    Thread safety

    A SerialArray is not safe for use by multiple concurrent threads. If a SerialArray is to be used by more than one thread then access to the SerialArray should be controlled by appropriate synchronization.
    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor and Description
      SerialArray(Array array)
      Constructs a new SerialArray object from the given Array object.
      SerialArray(Array array, Map<String,Class<?>> map)
      Constructs a new SerialArray object from the given Array object, using the given type map for the custom mapping of each element when the elements are SQL UDTs.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method and Description
      Object clone()
      Returns a clone of this SerialArray.
      boolean equals(Object obj)
      Compares this SerialArray to the specified object.
      void free()
      This method frees the SeriableArray object and releases the resources that it holds.
      Object getArray()
      Returns a new array that is a copy of this SerialArray object.
      Object getArray(long index, int count)
      Returns a new array that is a copy of a slice of this SerialArray object, starting with the element at the given index and containing the given number of consecutive elements.
      Object getArray(long index, int count, Map<String,Class<?>> map)
      Returns a new array that is a copy of a slice of this SerialArray object, starting with the element at the given index and containing the given number of consecutive elements.
      Object getArray(Map<String,Class<?>> map)
      Returns a new array that is a copy of this SerialArray object, using the given type map for the custom mapping of each element when the elements are SQL UDTs.
      int getBaseType()
      Retrieves the SQL type of the elements in this SerialArray object.
      String getBaseTypeName()
      Retrieves the DBMS-specific type name for the elements in this SerialArray object.
      ResultSet getResultSet()
      Retrieves a ResultSet object that contains all of the elements in the ARRAY value that this SerialArray object represents.
      ResultSet getResultSet(long index, int count)
      Retrieves a ResultSet object holding the elements of the subarray that starts at index index and contains up to count successive elements.
      ResultSet getResultSet(long index, int count, Map<String,Class<?>> map)
      Retrieves a result set holding the elements of the subarray that starts at Retrieves a ResultSet object that contains a subarray of the elements in this SerialArray object, starting at index index and containing up to count successive elements.
      ResultSet getResultSet(Map<String,Class<?>> map)
      Retrieves a ResultSet object that contains all of the elements of the SQL ARRAY value represented by this SerialArray object.
      int hashCode()
      Returns a hash code for this SerialArray.

    • Constructor Detail

      • SerialArray

        public SerialArray(Array array,
                   Map<String,Class<?>> map)
            throws SerialException,
                   SQLException
        Constructs a new SerialArray object from the given Array object, using the given type map for the custom mapping of each element when the elements are SQL UDTs.

        This method does custom mapping if the array elements are a UDT and the given type map has an entry for that UDT. Custom mapping is recursive, meaning that if, for instance, an element of an SQL structured type is an SQL structured type that itself has an element that is an SQL structured type, each structured type that has a custom mapping will be mapped according to the given type map.

        The new SerialArray object contains the same elements as the Array object from which it is built, except when the base type is the SQL type STRUCT, ARRAY, BLOB, CLOB, DATALINK or JAVA_OBJECT. In this case, each element in the new SerialArray object is the appropriate serialized form, that is, a SerialStruct, SerialArray, SerialBlob, SerialClob, SerialDatalink, or SerialJavaObject object.

        Note: (1) The Array object from which a SerialArray object is created must have materialized the SQL ARRAY value's data on the client before it is passed to the constructor. Otherwise, the new SerialArray object will contain no data.

        Note: (2) If the Array contains java.sql.Types.JAVA_OBJECT types, the SerialJavaObject constructor is called where checks are made to ensure this object is serializable.

        Note: (3) The Array object supplied to this constructor cannot return null for any Array.getArray() methods. SerialArray cannot serialize null array values.

        Parameters:
        array - the Array object to be serialized
        map - a java.util.Map object in which each entry consists of 1) a String object giving the fully qualified name of a UDT (an SQL structured type or distinct type) and 2) the Class object for the SQLData implementation that defines how the UDT is to be mapped. The map parameter does not have any effect for Blob, Clob, DATALINK, or JAVA_OBJECT types.
        Throws:
        SerialException - if an error occurs serializing the Array object
        SQLException - if a database access error occurs or if the array or the map values are null

      • SerialArray

        public SerialArray(Array array)
            throws SerialException,
                   SQLException
        Constructs a new SerialArray object from the given Array object.

        This constructor does not do custom mapping. If the base type of the array is an SQL structured type and custom mapping is desired, the constructor SerialArray(Array array, Map map) should be used.

        The new SerialArray object contains the same elements as the Array object from which it is built, except when the base type is the SQL type BLOB, CLOB, DATALINK or JAVA_OBJECT. In this case, each element in the new SerialArray object is the appropriate serialized form, that is, a SerialBlob, SerialClob, SerialDatalink, or SerialJavaObject object.

        Note: (1) The Array object from which a SerialArray object is created must have materialized the SQL ARRAY value's data on the client before it is passed to the constructor. Otherwise, the new SerialArray object will contain no data.

        Note: (2) The Array object supplied to this constructor cannot return null for any Array.getArray() methods. SerialArray cannot serialize null array values.

        Parameters:
        array - the Array object to be serialized
        Throws:
        SerialException - if an error occurs serializing the Array object
        SQLException - if a database access error occurs or the array parameter is null.

    • Method Detail

      • free

        public void free()
          throws SQLException
        This method frees the SeriableArray object and releases the resources that it holds. The object is invalid once the free method is called.

        If free is called multiple times, the subsequent calls to free are treated as a no-op.

        Specified by:
        free in interface Array
        Throws:
        SQLException - if an error occurs releasing the SerialArray's resources
        Since:
        1.6

      • getArray

        public Object getArray()
                throws SerialException
        Returns a new array that is a copy of this SerialArray object.
        Specified by:
        getArray in interface Array
        Returns:
        a copy of this SerialArray object as an Object in the Java programming language
        Throws:
        SerialException - if an error occurs; if free had previously been called on this object

      • getArray

        public Object getArray(Map<String,Class<?>> map)
                throws SerialException
        Returns a new array that is a copy of this SerialArray object, using the given type map for the custom mapping of each element when the elements are SQL UDTs.

        This method does custom mapping if the array elements are a UDT and the given type map has an entry for that UDT. Custom mapping is recursive, meaning that if, for instance, an element of an SQL structured type is an SQL structured type that itself has an element that is an SQL structured type, each structured type that has a custom mapping will be mapped according to the given type map.

        Specified by:
        getArray in interface Array
        Parameters:
        map - a java.util.Map object in which each entry consists of 1) a String object giving the fully qualified name of a UDT and 2) the Class object for the SQLData implementation that defines how the UDT is to be mapped
        Returns:
        a copy of this SerialArray object as an Object in the Java programming language
        Throws:
        SerialException - if an error occurs; if free had previously been called on this object

      • getArray

        public Object getArray(long index,
                       int count)
                throws SerialException
        Returns a new array that is a copy of a slice of this SerialArray object, starting with the element at the given index and containing the given number of consecutive elements.
        Specified by:
        getArray in interface Array
        Parameters:
        index - the index into this SerialArray object of the first element to be copied; the index of the first element is 0
        count - the number of consecutive elements to be copied, starting at the given index
        Returns:
        a copy of the designated elements in this SerialArray object as an Object in the Java programming language
        Throws:
        SerialException - if an error occurs; if free had previously been called on this object

      • getArray

        public Object getArray(long index,
                       int count,
                       Map<String,Class<?>> map)
                throws SerialException
        Returns a new array that is a copy of a slice of this SerialArray object, starting with the element at the given index and containing the given number of consecutive elements.

        This method does custom mapping if the array elements are a UDT and the given type map has an entry for that UDT. Custom mapping is recursive, meaning that if, for instance, an element of an SQL structured type is an SQL structured type that itself has an element that is an SQL structured type, each structured type that has a custom mapping will be mapped according to the given type map.

        Specified by:
        getArray in interface Array
        Parameters:
        index - the index into this SerialArray object of the first element to be copied; the index of the first element in the array is 0
        count - the number of consecutive elements to be copied, starting at the given index
        map - a java.util.Map object in which each entry consists of 1) a String object giving the fully qualified name of a UDT and 2) the Class object for the SQLData implementation that defines how the UDT is to be mapped
        Returns:
        a copy of the designated elements in this SerialArray object as an Object in the Java programming language
        Throws:
        SerialException - if an error occurs; if free had previously been called on this object

      • getBaseType

        public int getBaseType()
                throws SerialException
        Retrieves the SQL type of the elements in this SerialArray object. The int returned is one of the constants in the class java.sql.Types.
        Specified by:
        getBaseType in interface Array
        Returns:
        one of the constants in java.sql.Types, indicating the SQL type of the elements in this SerialArray object
        Throws:
        SerialException - if an error occurs; if free had previously been called on this object

      • getBaseTypeName

        public String getBaseTypeName()
                       throws SerialException
        Retrieves the DBMS-specific type name for the elements in this SerialArray object.
        Specified by:
        getBaseTypeName in interface Array
        Returns:
        the SQL type name used by the DBMS for the base type of this SerialArray object
        Throws:
        SerialException - if an error occurs; if free had previously been called on this object

      • getResultSet

        public ResultSet getResultSet(long index,
                              int count)
                       throws SerialException
        Retrieves a ResultSet object holding the elements of the subarray that starts at index index and contains up to count successive elements. This method uses the connection's type map to map the elements of the array if the map contains an entry for the base type. Otherwise, the standard mapping is used.
        Specified by:
        getResultSet in interface Array
        Parameters:
        index - the index into this SerialArray object of the first element to be copied; the index of the first element in the array is 0
        count - the number of consecutive elements to be copied, starting at the given index
        Returns:
        a ResultSet object containing the designated elements in this SerialArray object, with a separate row for each element
        Throws:
        SerialException - if called with the cause set to UnsupportedOperationException

      • getResultSet

        public ResultSet getResultSet(Map<String,Class<?>> map)
                       throws SerialException
        Retrieves a ResultSet object that contains all of the elements of the SQL ARRAY value represented by this SerialArray object. This method uses the specified map for type map customizations unless the base type of the array does not match a user-defined type (UDT) in map, in which case it uses the standard mapping. This version of the method getResultSet uses either the given type map or the standard mapping; it never uses the type map associated with the connection.
        Specified by:
        getResultSet in interface Array
        Parameters:
        map - a java.util.Map object in which each entry consists of 1) a String object giving the fully qualified name of a UDT and 2) the Class object for the SQLData implementation that defines how the UDT is to be mapped
        Returns:
        a ResultSet object containing all of the elements in this SerialArray object, with a separate row for each element
        Throws:
        SerialException - if called with the cause set to UnsupportedOperationException

      • getResultSet

        public ResultSet getResultSet()
                       throws SerialException
        Retrieves a ResultSet object that contains all of the elements in the ARRAY value that this SerialArray object represents. If appropriate, the elements of the array are mapped using the connection's type map; otherwise, the standard mapping is used.
        Specified by:
        getResultSet in interface Array
        Returns:
        a ResultSet object containing all of the elements in this SerialArray object, with a separate row for each element
        Throws:
        SerialException - if called with the cause set to UnsupportedOperationException

      • getResultSet

        public ResultSet getResultSet(long index,
                              int count,
                              Map<String,Class<?>> map)
                       throws SerialException
        Retrieves a result set holding the elements of the subarray that starts at Retrieves a ResultSet object that contains a subarray of the elements in this SerialArray object, starting at index index and containing up to count successive elements. This method uses the specified map for type map customizations unless the base type of the array does not match a user-defined type (UDT) in map, in which case it uses the standard mapping. This version of the method getResultSet uses either the given type map or the standard mapping; it never uses the type map associated with the connection.
        Specified by:
        getResultSet in interface Array
        Parameters:
        index - the index into this SerialArray object of the first element to be copied; the index of the first element in the array is 0
        count - the number of consecutive elements to be copied, starting at the given index
        map - a java.util.Map object in which each entry consists of 1) a String object giving the fully qualified name of a UDT and 2) the Class object for the SQLData implementation that defines how the UDT is to be mapped
        Returns:
        a ResultSet object containing the designated elements in this SerialArray object, with a separate row for each element
        Throws:
        SerialException - if called with the cause set to UnsupportedOperationException

      • equals

        public boolean equals(Object obj)
        Compares this SerialArray to the specified object. The result is true if and only if the argument is not null and is a SerialArray object whose elements are identical to this object's elements
        Overrides:
        equals in class Object
        Parameters:
        obj - The object to compare this SerialArray against
        Returns:
        true if the given object represents a SerialArray equivalent to this SerialArray, false otherwise
        See Also:
        Object.hashCode(), HashMap

      • clone

        public Object clone()
        Returns a clone of this SerialArray. The copy will contain a reference to a clone of the underlying objects array, not a reference to the original underlying object array of this SerialArray object.
        Overrides:
        clone in class Object
        Returns:
        a clone of this SerialArray
        See Also:
        Cloneable
Skip navigation links
Java™ Platform
Standard Ed. 8

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, 2022, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

微信小程序

微信扫一扫体验

微信公众账号

微信扫一扫加关注

 发表
评论 返回
顶部