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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openjpa.jdbc.sql;
import java.io.Serializable;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.lang.ObjectUtils;
import org.apache.openjpa.jdbc.identifier.DBIdentifier;
import org.apache.openjpa.jdbc.kernel.JDBCFetchConfiguration;
import org.apache.openjpa.jdbc.kernel.exps.CollectionParam;
import org.apache.openjpa.jdbc.kernel.exps.Val;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.schema.Sequence;
import org.apache.openjpa.jdbc.schema.Table;
import org.apache.openjpa.kernel.exps.Parameter;
/**
* Buffer for SQL statements that can be used to create
* java.sql.PreparedStatements.
* This buffer holds the SQL statement parameters and their corresponding
* columns. The parameters introduced by the runtime system are distinguished
* from the parameters set by the user.
*
* @author Marc Prud'hommeaux
* @author Abe White
* @author Pinaki Poddar
*
* @since 0.2.4
*/
public final class SQLBuffer
implements Serializable, Cloneable {
private static final String PARAMETER_TOKEN = "?";
private final DBDictionary _dict;
private final StringBuilder _sql = new StringBuilder();
private List _subsels = null;
private List _params = null;
private List _cols = null;
// Even element refers to an index of the _params list
// Odd element refers to the user parameter
private List _userIndex = null;
private List _userParams = null;
/**
* Default constructor.
*/
public SQLBuffer(DBDictionary dict) {
_dict = dict;
}
/**
* Copy constructor.
*/
public SQLBuffer(SQLBuffer buf) {
_dict = buf._dict;
append(buf);
}
/**
* Perform a shallow clone of this SQL Buffer.
*/
public Object clone() {
return new SQLBuffer(this);
}
/**
* Return true if the buffer is emtpy.
*/
public boolean isEmpty() {
return _sql.length() == 0;
}
/**
* Append all SQL and parameters of the given buffer.
*/
public SQLBuffer append(SQLBuffer buf) {
append(buf, _sql.length(), (_params == null) ? 0 : _params.size(),
true);
return this;
}
/**
* Append all SQL and parameters of the given buffer at the given positions.
*/
private void append(SQLBuffer buf, int sqlIndex, int paramIndex,
boolean subsels) {
if (subsels) {
// only allow appending of buffers with subselects, not insertion
if (_subsels != null && !_subsels.isEmpty()
&& sqlIndex != _sql.length())
throw new IllegalStateException();
if (buf._subsels != null && !buf._subsels.isEmpty()) {
if (sqlIndex != _sql.length())
throw new IllegalStateException();
if (_subsels == null)
_subsels = new ArrayList(buf._subsels.size());
for (int i = 0; i < buf._subsels.size(); i++)
_subsels.add(((Subselect) buf._subsels.get(i)).
clone(sqlIndex, paramIndex));
}
}
if (sqlIndex == _sql.length())
_sql.append(buf._sql.toString());
else
_sql.insert(sqlIndex, buf._sql.toString());
if (buf._params != null) {
if (_params == null)
_params = new ArrayList();
if (_cols == null && buf._cols != null) {
_cols = new ArrayList();
while (_cols.size() < _params.size())
_cols.add(null);
}
if (paramIndex == _params.size()) {
_params.addAll(buf._params);
if (buf._userParams != null) {
if (_userParams == null)
_userParams = new ArrayList();
_userParams.addAll(paramIndex, buf._userParams);
}
if (buf._userIndex != null) {
if (_userIndex == null)
_userIndex = new ArrayList();
_userIndex.addAll(buf._userIndex);
}
if (buf._cols != null)
_cols.addAll(buf._cols);
else if (_cols != null)
while (_cols.size() < _params.size())
_cols.add(null);
} else {
_params.addAll(paramIndex, buf._params);
if ( buf._userParams != null) {
if (_userParams == null)
_userParams = new ArrayList();
_userParams.addAll(paramIndex, buf._userParams);
}
if (buf._userIndex != null) {
if (_userIndex == null)
_userIndex = new ArrayList();
_userIndex.addAll(buf._userIndex);
}
if (buf._cols != null)
_cols.addAll(paramIndex, buf._cols);
else if (_cols != null)
while (_cols.size() < _params.size())
_cols.add(paramIndex, null);
}
}
if (_userIndex != null) {
// fix up user parameter index
for (int i = 0; i < _userIndex.size(); i+=2) {
_userIndex.set(i, _userParams.indexOf(_userIndex.get(i+1)));
}
}
}
public SQLBuffer append(DBIdentifier name) {
_sql.append(_dict.toDBName(name));
return this;
}
public SQLBuffer append(Table table) {
_sql.append(_dict.getFullName(table, false));
return this;
}
public SQLBuffer append(Sequence seq) {
_sql.append(_dict.getFullName(seq));
return this;
}
public SQLBuffer append(Column col) {
_sql.append(_dict.getColumnDBName(col));
return this;
}
public SQLBuffer append(String s) {
_sql.append(s);
return this;
}
/**
* Append a subselect. This delays resolution of the select SQL.
*/
public SQLBuffer append(Select sel, JDBCFetchConfiguration fetch) {
return append(sel, fetch, false);
}
/**
* Append a subselect count. This delays resolution of the select SQL.
*/
public SQLBuffer appendCount(Select sel, JDBCFetchConfiguration fetch) {
return append(sel, fetch, true);
}
/**
* Append a subselect. This delays resolution of the select SQL.
*/
private SQLBuffer append(Select sel, JDBCFetchConfiguration fetch,
boolean count) {
_sql.append("(");
Subselect sub = new Subselect();
sub.select = sel;
sub.fetch = fetch;
sub.count = count;
sub.sqlIndex = _sql.length();
sub.paramIndex = (_params == null) ? 0 : _params.size();
_sql.append(")");
if (_subsels == null)
_subsels = new ArrayList(2);
_subsels.add(sub);
return this;
}
/**
* Replace a subselect.
*/
public boolean replace(Select old, Select sel) {
if (_subsels == null)
return false;
Subselect sub;
for (int i = 0; i < _subsels.size(); i++) {
sub = (Subselect) _subsels.get(i);
if (sub.select == old) {
sub.select = sel;
return true;
}
}
return false;
}
/**
* Append a parameter value.
*/
public SQLBuffer appendValue(Object o) {
return appendValue(o, null);
}
/**
* Append a system inserted parameter value for a specific column.
*/
public SQLBuffer appendValue(Object o, Column col) {
return appendValue(o, col, null);
}
/**
* Append a user parameter value for a specific column. User parameters
* are marked as opposed to the parameters inserted by the internal runtime
* system. This helps to reuse the buffer by reparmeterizing it with new
* set of user parameters while the 'internal' parameters remain unchanged.
*
* @param userParam if non-null, designates a 'user' parameter.
*/
public SQLBuffer appendValue(Object o, Column col, Parameter userParam) {
if (o == null)
_sql.append("NULL");
else if (o instanceof Raw)
_sql.append(o.toString());
else {
_sql.append(PARAMETER_TOKEN);
// initialize param and col lists; we hold off on col list until
// we get the first non-null col
if (_params == null)
_params = new ArrayList();
if (_userParams == null)
_userParams = new ArrayList();
if (col != null && _cols == null) {
_cols = new ArrayList();
while (_cols.size() < _params.size())
_cols.add(null);
}
_params.add(o);
if (userParam != null) {
Object param = userParam;
if (userParam instanceof CollectionParam)
param = ((CollectionParam) userParam).clone();
_userParams.add(param);
if (_userIndex == null)
_userIndex = new ArrayList();
int index = _params.size()-1;
_userIndex.add(index);
_userIndex.add(param);
}
else
_userParams.add(o);
if (_cols != null)
_cols.add(col);
}
return this;
}
/**
* Return the list of parameter values.
*/
public List getParameters() {
return (_params == null) ? Collections.EMPTY_LIST : _params;
}
/**
* Get the user parameter positions in the list of parameters. The odd
* element of the returned list contains an integer index that refers
* to the position in the {@link #getParameters()} list. The even element
* of the returned list refers to the user parameter key.
* This structure is preferred over a normal map because a user parameter
* may occur more than one in the parameters.
*/
public List getUserParameters() {
if (_userIndex == null)
return Collections.EMPTY_LIST;
return _userIndex;
}
/**
* Return the SQL for this buffer.
*/
public String getSQL() {
return getSQL(false);
}
/**
* Returns the SQL for this buffer.
*
* @param replaceParams if true, then replace parameters with the
* actual parameter values
*/
public String getSQL(boolean replaceParams) {
resolveSubselects();
String sql = _sql.toString();
if (!replaceParams || _params == null || _params.isEmpty())
return sql;
StringBuilder buf = new StringBuilder();
Iterator pi = _params.iterator();
for (int i = 0; i < sql.length(); i++) {
if (sql.charAt(i) != '?') {
buf.append(sql.charAt(i));
continue;
}
Object param = pi.hasNext() ? pi.next() : null;
if (param == null)
buf.append("NULL");
else if (param instanceof Number || param instanceof Boolean)
buf.append(param);
else if (param instanceof String || param instanceof Character)
buf.append("'").append(param).append("'");
else
buf.append("?");
}
return buf.toString();
}
/**
* Resolve our delayed subselects.
*/
private void resolveSubselects() {
if (_subsels == null || _subsels.isEmpty())
return;
// add subsels backwards so that the stored insertion points of
// later subsels remain valid
Subselect sub;
SQLBuffer buf;
for (int i = _subsels.size() - 1; i >= 0; i--) {
sub = (Subselect) _subsels.get(i);
if (sub.count)
buf = sub.select.toSelectCount();
else
buf = sub.select.toSelect(false, sub.fetch);
buf.resolveSubselects();
append(buf, sub.sqlIndex, sub.paramIndex, false);
}
_subsels.clear();
}
/**
* Create and populate the parameters of a prepared statement using
* the SQL in this buffer.
*/
public PreparedStatement prepareStatement(Connection conn)
throws SQLException {
return prepareStatement(conn, ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_READ_ONLY);
}
/**
* Create and populate the parameters of a prepared statement using
* the SQL in this buffer.
*/
public PreparedStatement prepareStatement(Connection conn, int rsType,
int rsConcur)
throws SQLException {
return prepareStatement(conn, null, rsType, rsConcur);
}
/**
* Create and populate the parameters of a prepred statement using the
* SQL in this buffer and the given fetch configuration.
*/
public PreparedStatement prepareStatement(Connection conn,
JDBCFetchConfiguration fetch, int rsType, int rsConcur)
throws SQLException {
if (rsType == -1 && fetch == null)
rsType = ResultSet.TYPE_FORWARD_ONLY;
else if (rsType == -1)
rsType = fetch.getResultSetType();
if (rsConcur == -1)
rsConcur = ResultSet.CONCUR_READ_ONLY;
PreparedStatement stmnt;
if (rsType == ResultSet.TYPE_FORWARD_ONLY
&& rsConcur == ResultSet.CONCUR_READ_ONLY)
stmnt = conn.prepareStatement(getSQL());
else
stmnt = conn.prepareStatement(getSQL(), rsType, rsConcur);
try {
setParameters(stmnt);
if (fetch != null) {
if (fetch.getFetchBatchSize() > 0)
stmnt.setFetchSize(
_dict.getBatchFetchSize(fetch.getFetchBatchSize()));
if (rsType != ResultSet.TYPE_FORWARD_ONLY
&& fetch.getFetchDirection() != ResultSet.FETCH_FORWARD)
stmnt.setFetchDirection(fetch.getFetchDirection());
}
return stmnt;
} catch (SQLException se) {
try {
stmnt.close();
} catch (SQLException se2) {
}
throw se;
}
}
/**
* Create and populate the parameters of a prepared statement using
* the SQL in this buffer.
*/
public CallableStatement prepareCall(Connection conn)
throws SQLException {
return prepareCall(conn, ResultSet.TYPE_FORWARD_ONLY,
ResultSet.CONCUR_READ_ONLY);
}
/**
* Create and populate the parameters of a prepared statement using
* the SQL in this buffer.
*/
public CallableStatement prepareCall(Connection conn, int rsType,
int rsConcur)
throws SQLException {
return prepareCall(conn, null, rsType, rsConcur);
}
/**
* Create and populate the parameters of a prepred statement using the
* SQL in this buffer and the given fetch configuration.
*/
public CallableStatement prepareCall(Connection conn,
JDBCFetchConfiguration fetch, int rsType, int rsConcur)
throws SQLException {
if (rsType == -1 && fetch == null)
rsType = ResultSet.TYPE_FORWARD_ONLY;
else if (rsType == -1)
rsType = fetch.getResultSetType();
if (rsConcur == -1)
rsConcur = ResultSet.CONCUR_READ_ONLY;
CallableStatement stmnt;
if (rsType == ResultSet.TYPE_FORWARD_ONLY
&& rsConcur == ResultSet.CONCUR_READ_ONLY)
stmnt = conn.prepareCall(getSQL());
else
stmnt = conn.prepareCall(getSQL(), rsType, rsConcur);
try {
setParameters(stmnt);
if (fetch != null) {
if (fetch.getFetchBatchSize() > 0)
stmnt.setFetchSize(
_dict.getBatchFetchSize(fetch.getFetchBatchSize()));
if (rsType != ResultSet.TYPE_FORWARD_ONLY
&& fetch.getFetchDirection() != ResultSet.FETCH_FORWARD)
stmnt.setFetchDirection(fetch.getFetchDirection());
}
return stmnt;
} catch (SQLException se) {
try {
stmnt.close();
} catch (SQLException se2) {
}
throw se;
}
}
/**
* Populate the parameters of an existing PreparedStatement
* with values from this buffer.
*/
public void setParameters(PreparedStatement ps)
throws SQLException {
if (_params == null)
return;
Column col;
for (int i = 0; i < _params.size(); i++) {
col = (_cols == null) ? null : (Column) _cols.get(i);
_dict.setUnknown(ps, i + 1, _params.get(i), col);
}
}
public int hashCode() {
int hash = _sql.hashCode();
return (_params == null) ? hash : hash ^ _params.hashCode();
}
/**
* Compare internal SQL without resolving subselects or stringifying
* parameters.
*/
public boolean sqlEquals(String sql) {
return _sql.toString().equals(sql);
}
public boolean equals(Object other) {
if (other == this)
return true;
if (!(other instanceof SQLBuffer))
return false;
SQLBuffer buf = (SQLBuffer) other;
return _sql.equals(buf._sql)
&& ObjectUtils.equals(_params, buf._params);
}
/**
* Replace SQL '?' with CAST string if required by DB platform
* @param oper
* @param val
*/
public void addCastForParam(String oper, Val val) {
if (_sql.charAt(_sql.length() - 1) == '?') {
String castString = _dict.addCastAsType(oper, val);
if (castString != null)
_sql.replace(_sql.length() - 1, _sql.length(), castString);
}
}
/**
* Replace current buffer string with the new string
*
* @param start replace start position
* @param end replace end position
* @param newString
*/
public void replaceSqlString(int start, int end, String newString) {
_sql.replace(start, end, newString);
}
/**
* Represents a subselect.
*/
private static class Subselect {
public Select select;
public JDBCFetchConfiguration fetch;
public boolean count;
public int sqlIndex;
public int paramIndex;
public Subselect clone(int sqlIndex, int paramIndex) {
if (sqlIndex == 0 && paramIndex == 0)
return this;
Subselect sub = new Subselect();
sub.select = select;
sub.fetch = fetch;
sub.count = count;
sub.sqlIndex = this.sqlIndex + sqlIndex;
sub.paramIndex = this.paramIndex + paramIndex;
return sub;
}
}
public void setParameters(List params) {
_params = params;
}
public List getColumns() {
return _cols;
}
}
