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Groovy example source code file (SqlGroovyMethods.java)

This example Groovy source code file (SqlGroovyMethods.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

groovyrowresult, groovyruntimeexception, iterator, iterator, jdbc, map, object, resultsetmetadata, resultsetmetadata, resultsetmetadataiterator, resultsetmetadataiterator, resultsetmetadatawrapper, sql, sqlexception, sqlexception, unsupportedoperationexception, util

The Groovy SqlGroovyMethods.java source code

/*
 * Copyright 2003-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.runtime;

import groovy.lang.GroovyRuntimeException;
import groovy.sql.GroovyResultSet;
import groovy.sql.GroovyRowResult;
import groovy.sql.ResultSetMetaDataWrapper;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * This class defines all the new SQL-related groovy methods which enhance
 * the normal JDK SQL classes when inside the Groovy environment.
 * Static methods are used with the first parameter the destination class.
 *
 * @author Paul King
 * @author John Hurst
 */
public class SqlGroovyMethods {

    /**
     * Returns a GroovyRowResult given a ResultSet.
     *
     * @param rs a ResultSet
     * @return the resulting GroovyRowResult
     * @throws java.sql.SQLException if a database error occurs
     * @since 1.6.0
     */
    public static GroovyRowResult toRowResult(ResultSet rs) throws SQLException {
        ResultSetMetaData metadata = rs.getMetaData();
        Map<String, Object> lhm = new LinkedHashMap(metadata.getColumnCount(), 1);
        for (int i = 1; i <= metadata.getColumnCount(); i++) {
            lhm.put(metadata.getColumnLabel(i), rs.getObject(i));
        }
        return new GroovyRowResult(lhm);
    }

    /**
     * Return a java.sql.Timestamp given a java.util.Date.
     *
     * @param d a date
     * @return the date wrapped as a Timestamp
     * @since 1.6.6
     */
    public static Timestamp toTimestamp(Date d) {
        return new Timestamp(d.getTime());
    }

    /**
     * Coerce a GroovyResultSet to a boolean value.
     * A GroovyResultSet is coerced to false if there are no more rows to iterate over,
     * and to true otherwise.
     *
     * @param grs the GroovyResultSet
     * @return the boolean value
     * @since 1.7.0
     */
    public static boolean asBoolean(GroovyResultSet grs) {
        //TODO: check why this asBoolean() method is needed for SqlTest to pass with custom boolean coercion in place
        return true;
    }

    /**
     * Return an Iterator given a ResultSetMetaData.
     *
     * Enables Groovy collection method syntactic sugar on ResultSetMetaData.
     *
     * @param resultSetMetaData the ResultSetMetaData to iterate over
     * @return an iterator for the ResultSetMetaData
     * @since 1.7
     */
    public static Iterator<ResultSetMetaDataWrapper> iterator(ResultSetMetaData resultSetMetaData) {
        return new ResultSetMetaDataIterator(resultSetMetaData);
    }

    private static class ResultSetMetaDataIterator implements Iterator<ResultSetMetaDataWrapper> {
        private ResultSetMetaData target;
        private int index = 1;

        public ResultSetMetaDataIterator(ResultSetMetaData target) {
            this.target = target;
        }

        public boolean hasNext() {
            try {
                return index <= target.getColumnCount();
            }
            catch (SQLException ex) {
                throw new GroovyRuntimeException("Unable to obtain column count from ResultSetMetaData", ex);
            }
        }

        public ResultSetMetaDataWrapper next() {
            return new ResultSetMetaDataWrapper(target, index++);
        }

        public void remove() {
            throw new UnsupportedOperationException("Cannot remove from ResultSetMetaData");
        }
    }

}

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