Java SQL PreparedStatement intToArray(final int[] arr)

Description

Converts an array of integers to an Array object that can be used in a PreparedStatement for Postgresql to set an int4[] column.

License

BSD License

Parameter

Parameter	Description
arr	The array of integers.

Return

The SQL Array object, if a null array was specified.

Declaration

public static Array intToArray(final int[] arr) 

Method Source Code

//package com.java2s;
/*// w  w w.  j  a va2s  .c om
 * = License =
    
McLean Computer Services Open Source Software License
    
(Looks like the BSD license, but less restrictive.)
    
Copyright (c) 2006-2011 Evan McLean. All rights reserved.
    
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
    
2. Neither the names "Evan McLean", "McLean Computer Services", "EvLib" nor the
names of any contributors may be used to endorse or promote products derived
from this software without prior written permission.
    
3. Products derived from this software may not be called "Evlib", nor may
"Evlib" appear in their name, without prior written permission.
    
THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
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OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    
= License =
 */

import java.sql.Array;

import java.sql.ResultSet;

import java.util.Map;

public class Main {
    /**
     * <p>
     * Converts an array of integers to an Array object that can be used in a
     * PreparedStatement for Postgresql to set an <tt>int4[]</tt> column.
     * </p>
     * 
     * <p>
     * <i>FYI:</i> When reading an int array column from Postgres, you can take
     * the <tt>Array</tt> object returned by <tt>ResultSet.getArray</tt> and get
     * the details by the code &quot;<tt>(int[]) arrobject.getArray()</tt>&quot;,
     * or you could use the <tt>getResultSet</tt> method instead.
     * </p>
     * 
     * <p>
     * <b>NOTE:</b> If you are using a JDBC driver that fully implements java 1.6
     * Connection objects then use <code>Connection.createArrayOf()</code> instead
     * of this function.
     * </p>
     * 
     * @param arr
     *        The array of integers.
     * @return The SQL Array object, if a null array was specified.
     */
    public static Array intToArray(final int[] arr) {
        return intToArray(arr, "int4");
    }

    /**
     * <p>
     * Converts an array of integers to an Array object that can be used in a
     * PreparedStatement for Postgresql.
     * </p>
     * 
     * <p>
     * <i>FYI:</i> When reading an int array column from Postgres, you can take
     * the <tt>Array</tt> object returned by <tt>ResultSet.getArray</tt> and get
     * the details by the code &quot;<tt>(int[]) arrobject.getArray()</tt>&quot;,
     * or you could use the <tt>getResultSet</tt> method instead.
     * </p>
     * 
     * <p>
     * <b>NOTE:</b> If you are using a JDBC driver that fully implements java 1.6
     * Connection objects then use <code>Connection.createArrayOf()</code> instead
     * of this function.
     * </p>
     * 
     * @param arr
     *        The array of integers.
     * @param base_type_name
     *        The base type of the integer array column you are trying to set.
     *        Will usually be <tt>int4</tt>, or one of the other integer types
     *        such as <tt>integer</tt>, <tt>int</tt>, <tt>int2</tt>, <tt>int8</tt>
     *        , <tt>smallint</tt> or <tt>bigint</tt>.
     * @return The SQL Array object, if a null array was specified.
     */
    public static Array intToArray(final int[] arr, final String base_type_name) {
        if (arr == null)
            return null;
        return new Array() {
            @SuppressWarnings("unused")
            public void free() {
                // empty
            }

            public Object getArray() {
                throw new RuntimeException("Should never call this.");
            }

            public Object getArray(final long index, final int count) {
                throw new RuntimeException("Should never call this.");
            }

            public Object getArray(final long index, final int count, final Map<String, Class<?>> map) {
                throw new RuntimeException("Should never call this.");
            }

            public Object getArray(final Map<String, Class<?>> map) {
                throw new RuntimeException("Should never call this.");
            }

            public int getBaseType() {
                throw new RuntimeException("Should never call this.");
            }

            public String getBaseTypeName() {
                return base_type_name;
            }

            public ResultSet getResultSet() {
                throw new RuntimeException("Should never call this.");
            }

            public ResultSet getResultSet(final long index, final int count) {
                throw new RuntimeException("Should never call this.");
            }

            public ResultSet getResultSet(final long index, final int count, final Map<String, Class<?>> map) {
                throw new RuntimeException("Should never call this.");
            }

            public ResultSet getResultSet(final Map<String, Class<?>> map) {
                throw new RuntimeException("Should never call this.");
            }

            @Override
            public String toString() {
                final StringBuilder buff = new StringBuilder("{");
                if (arr.length != 0) {
                    buff.append(arr[0]);
                    for (int xi = 1; xi < arr.length; xi++) {
                        buff.append(',');
                        buff.append(arr[xi]);
                    }
                }
                buff.append('}');
                return buff.toString();
            }
        };
    }
}

Related

1. getPreparedStatement(Connection conn, String sql, List