/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.jstl.el;
import com.caucho.el.Expr;
import com.caucho.jstl.ResultImpl;
import com.caucho.util.L10N;
import javax.el.ELContext;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.jstl.core.Config;
import javax.servlet.jsp.jstl.sql.Result;
import javax.servlet.jsp.jstl.sql.SQLExecutionTag;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
public class SqlQueryTag extends BodyTagSupport implements SQLExecutionTag {
private static final Logger log
= Logger.getLogger(SqlQueryTag.class.getName());
private static final L10N L = new L10N(SqlQueryTag.class);
private Expr _sql;
private String _var;
private String _scope;
private Expr _dataSource;
private Expr _maxRows;
private Expr _startRow;
private ArrayList<Object> _params;
/**
* Sets the JSP-EL expression for the SQL.
*/
public void setSql(Expr sql)
{
_sql = sql;
}
/**
* Sets the variable name.
*/
public void setVar(String var)
{
_var = var;
}
/**
* Sets the scope.
*/
public void setScope(String scope)
{
_scope = scope;
}
/**
* Sets the data source.
*/
public void setDataSource(Expr dataSource)
{
_dataSource = dataSource;
}
/**
* Sets the maximum number of rows.
*/
public void setMaxRows(Expr maxRows)
{
_maxRows = maxRows;
}
/**
* Sets the start row.
*/
public void setStartRow(Expr startRow)
{
_startRow = startRow;
}
/**
* Adds a parameter.
*/
public void addSQLParameter(Object value)
{
if (_params == null)
_params = new ArrayList<Object>();
_params.add(value);
}
public int doEndTag() throws JspException
{
Connection conn = null;
boolean isTransaction = false;
ELContext env = pageContext.getELContext();
try {
String sql;
if (_sql != null)
sql = _sql.evalString(env);
else
sql = bodyContent.getString();
conn = (Connection) pageContext.getAttribute("caucho.jstl.sql.conn");
if (conn != null)
isTransaction = true;
if (! isTransaction) {
DataSource ds;
if (_dataSource != null)
ds = getDataSource(pageContext, _dataSource.evalObject(env));
else
ds = getDataSource(pageContext, null);
conn = ds.getConnection();
}
Object value = null;
ResultSet rs;
ArrayList params = _params;
_params = null;
Statement stmt;
if (params == null) {
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
else {
PreparedStatement pstmt = conn.prepareStatement(sql);
stmt = pstmt;
for (int i = 0; i < params.size(); i++) {
Object paramValue = params.get(i);
if (paramValue == null)
pstmt.setNull(i + 1, Types.VARCHAR);
else
pstmt.setObject(i + 1, paramValue);
}
rs = pstmt.executeQuery();
}
if (_startRow != null) {
int startRow = (int) _startRow.evalLong(env);
while (startRow-- > 0 && rs.next()) {
}
}
Result result;
if (_maxRows != null)
result = new ResultImpl(rs, (int) _maxRows.evalLong(env));
else
result = new ResultImpl(rs, -1);
rs.close();
stmt.close();
CoreSetTag.setValue(pageContext, _var, _scope, result);
} catch (Exception e) {
throw new JspException(e);
} finally {
if (! isTransaction && conn != null) {
try {
conn.close();
} catch (Exception e) {
log.log(Level.FINE, e.toString(), e);
}
}
}
return EVAL_PAGE;
}
public static DataSource getDataSource(PageContext pageContext,
Object ds)
throws JspException
{
if (ds == null)
ds = Config.find(pageContext, Config.SQL_DATA_SOURCE);
if (ds instanceof DataSource)
return (DataSource) ds;
else if (! (ds instanceof String))
throw new JspException(L.l("`{0}' is an invalid DataSource.", ds));
String key = (String) ds;
try {
String jndiName;
if (key.startsWith("java:comp/"))
jndiName = key;
else
jndiName = "java:comp/env/" + key;
Object value = new InitialContext().lookup(jndiName);
if (value instanceof DataSource)
return (DataSource) value;
} catch (NamingException e) {
}
throw new JspException(L.l("`{0}' is an invalid DataSource.", ds));
}
}