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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2007 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 groovy.sql;
import groovy.lang.Closure;
import groovy.lang.GroovyObjectSupport;
import groovy.lang.MissingPropertyException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.ResultSetMetaData;
import java.util.Iterator;
import java.util.Map;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.InvokerInvocationException;
/**
* GroovyResultSetExtension implements additional logic for ResultSet. Due to
* the version incompatibility between java6 and java5 this methods are moved
* here from the original GroovyResultSet class. The methods in this class are
* used by the proxy GroovyResultSetProxy, which will try to invoke methods
* on this class before invokeing it on ResultSet.
*
* This class is not intended to be used directly. Should be used through
* GroovyResultSetProxy only!
*
* @author Jochen Theodorou
* @see GroovyResultSet
* @see GroovyResultSetProxy
*/
public class GroovyResultSetExtension extends GroovyObjectSupport {
private boolean updated;
private final ResultSet resultSet;
/**
* Gets the current result set.
*
* @return the result set
* @throws SQLException if the result set can not be returned
*/
protected ResultSet getResultSet() throws SQLException {
return resultSet;
}
/**
* Creats a GroovyResultSet implementation-
*
* @param set the result set
*/
public GroovyResultSetExtension(ResultSet set) {
updated = false;
resultSet = set;
}
public String toString() {
try {
StringBuffer sb = new StringBuffer("[");
ResultSetMetaData metaData = resultSet.getMetaData();
int count = metaData.getColumnCount();
for (int i = 1; i <= count; i++) {
sb.append(metaData.getColumnName(i));
sb.append(":");
Object object = resultSet.getObject(i);
if (object!=null) {
sb.append(object.toString());
} else {
sb.append("[null]");
}
if (i < count) {
sb.append(", ");
}
}
sb.append("]");
return sb.toString();
} catch (SQLException e) {
// System.err.println("e.getMessage() = " + e.getMessage());
return super.toString();
}
}
public Object invokeMethod(String name, Object args) {
try {
return InvokerHelper.invokeMethod(getResultSet(), name, args);
} catch (SQLException se) {
throw new InvokerInvocationException(se);
}
}
/**
* Gets the value of the designated column in the current row
* of as an Object.
*
* @param columnName the SQL name of the column
* @return the returned column value
* @throws MissingPropertyException if an SQLException happens while getting the object
* @see groovy.lang.GroovyObject#getProperty(java.lang.String)
* @see ResultSet#getObject(java.lang.String)
*/
public Object getProperty(String columnName) {
try {
return getResultSet().getObject(columnName);
}
catch (SQLException e) {
throw new MissingPropertyException(columnName, GroovyResultSetProxy.class, e);
}
}
/**
* Updates the designated column with an Object value.
*
* @param columnName the SQL name of the column
* @param newValue the updated value
* @throws MissingPropertyException if an SQLException happens while setting the new value
* @see groovy.lang.GroovyObject#setProperty(java.lang.String, java.lang.Object)
* @see ResultSet#updateObject(java.lang.String, java.lang.Object)
*/
public void setProperty(String columnName, Object newValue) {
try {
getResultSet().updateObject(columnName, newValue);
updated = true;
}
catch (SQLException e) {
throw new MissingPropertyException(columnName, GroovyResultSetProxy.class, e);
}
}
/**
* Supports integer based subscript operators for accessing at numbered columns
* starting at zero. Negative indices are supported, they will count from the last column backwards.
*
* @param index is the number of the column to look at starting at 1
* @return the returned column value
* @throws java.sql.SQLException if something goes wrong
* @see ResultSet#getObject(int)
*/
public Object getAt(int index) throws SQLException {
index = normalizeIndex(index);
return getResultSet().getObject(index);
}
/**
* Supports integer based subscript operators for updating the values of numbered columns
* starting at zero. Negative indices are supported, they will count from the last column backwards.
*
* @param index is the number of the column to look at starting at 1
* @param newValue the updated value
* @throws java.sql.SQLException if something goes wrong
* @see ResultSet#updateObject(java.lang.String, java.lang.Object)
*/
public void putAt(int index, Object newValue) throws SQLException {
index = normalizeIndex(index);
getResultSet().updateObject(index, newValue);
}
/**
* Adds a new row to the result set
*
* @param values a map containing the mappings for column names and values
* @throws java.sql.SQLException if something goes wrong
* @see ResultSet#insertRow()
* @see ResultSet#updateObject(java.lang.String, java.lang.Object)
* @see ResultSet#moveToInsertRow()
*/
public void add(Map values) throws SQLException {
getResultSet().moveToInsertRow();
for (Iterator iter = values.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
getResultSet().updateObject(entry.getKey().toString(), entry.getValue());
}
getResultSet().insertRow();
}
/**
* Takes a zero based index and convert it into an SQL based 1 based index.
* A negative index will count backwards from the last column.
*
* @param index the raw requested index (may be negative)
* @return a JDBC index
* @throws SQLException if some exception occurs finding out the column count
*/
protected int normalizeIndex(int index) throws SQLException {
if (index < 0) {
int columnCount = getResultSet().getMetaData().getColumnCount();
do {
index += columnCount;
}
while (index < 0);
}
return index + 1;
}
/**
* Call the closure once for each row in the result set.
*
* @param closure the closure to perform on each row
* @throws SQLException if something goes wrong
*/
public void eachRow(Closure closure) throws SQLException {
while (next()) {
closure.call(this);
}
}
// Implementation of java.sql.getResultSet()
// ------------------------------------------------------------
/**
* Moves the cursor down one row from its current position.
* A getResultSet() cursor is initially positioned
* before the first row; the first call to the method
* next makes the first row the current row; the
* second call makes the second row the current row, and so on.
*
* If an input stream is open for the current row, a call
* to the method next will
* implicitly close it. A getResultSet() object's
* warning chain is cleared when a new row is read.
*
* @return true if the new current row is valid;
* false if there are no more rows
* @throws SQLException if a database access error occurs
*/
public boolean next() throws SQLException {
if (updated) {
getResultSet().updateRow();
updated = false;
}
return getResultSet().next();
}
/**
* Moves the cursor to the previous row in this
* getResultSet() object.
*
* @return true if the cursor is on a valid row;
* false if it is off the result set
* @throws SQLException if a database access error
* occurs or the result set type is TYPE_FORWARD_ONLY
* @since 1.2
*/
public boolean previous() throws SQLException {
if (updated) {
getResultSet().updateRow();
updated = false;
}
return getResultSet().previous();
}
}