org.skife.jdbi.v2.ColonPrefixNamedParamStatementRewriter Maven / Gradle / Ivy
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jDBI is designed to provide convenient tabular data access in
Java(tm). It uses the Java collections framework for query
results, provides a convenient means of externalizing sql
statements, and provides named parameter support for any database
being used.
/*
* 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.skife.jdbi.v2;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.Token;
import org.skife.jdbi.rewriter.colon.ColonStatementLexer;
import org.skife.jdbi.v2.exceptions.UnableToCreateStatementException;
import org.skife.jdbi.v2.exceptions.UnableToExecuteStatementException;
import org.skife.jdbi.v2.tweak.Argument;
import org.skife.jdbi.v2.tweak.RewrittenStatement;
import org.skife.jdbi.v2.tweak.StatementRewriter;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import static org.skife.jdbi.rewriter.colon.ColonStatementLexer.DOUBLE_QUOTED_TEXT;
import static org.skife.jdbi.rewriter.colon.ColonStatementLexer.ESCAPED_TEXT;
import static org.skife.jdbi.rewriter.colon.ColonStatementLexer.LITERAL;
import static org.skife.jdbi.rewriter.colon.ColonStatementLexer.NAMED_PARAM;
import static org.skife.jdbi.rewriter.colon.ColonStatementLexer.POSITIONAL_PARAM;
import static org.skife.jdbi.rewriter.colon.ColonStatementLexer.QUOTED_TEXT;
/**
* Statement rewriter which replaces named parameter tokens of the form :tokenName
*
* This is the default statement rewriter
*/
public class ColonPrefixNamedParamStatementRewriter implements StatementRewriter
{
private final Map cache = Collections.synchronizedMap(new WeakHashMap());
/**
* Munge up the SQL as desired. Responsible for figuring out ow to bind any
* arguments in to the resultant prepared statement.
*
* @param sql The SQL to rewrite
* @param params contains the arguments which have been bound to this statement.
* @param ctx The statement context for the statement being executed
* @return something which can provide the actual SQL to prepare a statement from
* and which can bind the correct arguments to that prepared statement
*/
@Override
public RewrittenStatement rewrite(String sql, Binding params, StatementContext ctx)
{
ParsedStatement stmt = cache.get(sql);
if (stmt == null) {
try {
stmt = parseString(sql);
cache.put(sql, stmt);
}
catch (IllegalArgumentException e) {
throw new UnableToCreateStatementException("Exception parsing for named parameter replacement", e, ctx);
}
}
return new MyRewrittenStatement(stmt, ctx);
}
ParsedStatement parseString(final String sql) throws IllegalArgumentException
{
ParsedStatement stmt = new ParsedStatement();
StringBuilder b = new StringBuilder();
ColonStatementLexer lexer = new ColonStatementLexer(new ANTLRStringStream(sql));
Token t = lexer.nextToken();
while (t.getType() != ColonStatementLexer.EOF) {
switch (t.getType()) {
case LITERAL:
b.append(t.getText());
break;
case NAMED_PARAM:
stmt.addNamedParamAt(t.getText().substring(1, t.getText().length()));
b.append("?");
break;
case QUOTED_TEXT:
b.append(t.getText());
break;
case DOUBLE_QUOTED_TEXT:
b.append(t.getText());
break;
case POSITIONAL_PARAM:
b.append("?");
stmt.addPositionalParamAt();
break;
case ESCAPED_TEXT:
b.append(t.getText().substring(1));
break;
default:
break;
}
t = lexer.nextToken();
}
stmt.sql = b.toString();
return stmt;
}
private static class MyRewrittenStatement implements RewrittenStatement
{
private final ParsedStatement stmt;
private final StatementContext context;
public MyRewrittenStatement(ParsedStatement stmt, StatementContext ctx)
{
this.context = ctx;
this.stmt = stmt;
}
@Override
public void bind(Binding params, PreparedStatement statement) throws SQLException
{
if (stmt.positionalOnly) {
// no named params, is easy
boolean finished = false;
for (int i = 0; !finished; ++i) {
final Argument a = params.forPosition(i);
if (a != null) {
try {
a.apply(i + 1, statement, this.context);
}
catch (SQLException e) {
throw new UnableToExecuteStatementException(
String.format("Exception while binding positional param at (0 based) position %d",
i), e, context);
}
}
else {
finished = true;
}
}
}
else {
//List named_params = stmt.params;
int i = 0;
for (String named_param : stmt.params) {
if ("*".equals(named_param)) {
continue;
}
Argument a = params.forName(named_param);
if (a == null) {
a = params.forPosition(i);
}
if (a == null) {
String msg = String.format("Unable to execute, no named parameter matches " +
"\"%s\" and no positional param for place %d (which is %d in " +
"the JDBC 'start at 1' scheme) has been set.",
named_param, i, i + 1);
throw new UnableToExecuteStatementException(msg, context);
}
try {
a.apply(i + 1, statement, this.context);
}
catch (SQLException e) {
throw new UnableToCreateStatementException(String.format("Exception while binding '%s'",
named_param), e, context);
}
i++;
}
}
}
@Override
public String getSql()
{
return stmt.getParsedSql();
}
}
static class ParsedStatement
{
private String sql;
private boolean positionalOnly = true;
private List params = new ArrayList();
public void addNamedParamAt(String name)
{
positionalOnly = false;
params.add(name);
}
public void addPositionalParamAt()
{
params.add("*");
}
public String getParsedSql()
{
return sql;
}
}
}