/*
* Copyright 2002-2016 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.springframework.jdbc.core.namedparam;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.support.DataAccessUtils;
import org.springframework.jdbc.core.ColumnMapRowMapper;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCallback;
import org.springframework.jdbc.core.PreparedStatementCreator;
import org.springframework.jdbc.core.PreparedStatementCreatorFactory;
import org.springframework.jdbc.core.ResultSetExtractor;
import org.springframework.jdbc.core.RowCallbackHandler;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.SingleColumnRowMapper;
import org.springframework.jdbc.core.SqlParameter;
import org.springframework.jdbc.core.SqlRowSetResultSetExtractor;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.jdbc.support.rowset.SqlRowSet;
import org.springframework.util.Assert;
/**
* Template class with a basic set of JDBC operations, allowing the use
* of named parameters rather than traditional '?' placeholders.
*
* <p>This class delegates to a wrapped {@link #getJdbcOperations() JdbcTemplate}
* once the substitution from named parameters to JDBC style '?' placeholders is
* done at execution time. It also allows for expanding a {@link java.util.List}
* of values to the appropriate number of placeholders.
*
* <p>The underlying {@link org.springframework.jdbc.core.JdbcTemplate} is
* exposed to allow for convenient access to the traditional
* {@link org.springframework.jdbc.core.JdbcTemplate} methods.
*
* <p><b>NOTE: An instance of this class is thread-safe once configured.</b>
*
* @author Thomas Risberg
* @author Juergen Hoeller
* @since 2.0
* @see NamedParameterJdbcOperations
* @see org.springframework.jdbc.core.JdbcTemplate
*/
public class NamedParameterJdbcTemplate implements NamedParameterJdbcOperations {
/** Default maximum number of entries for this template's SQL cache: 256 */
public static final int DEFAULT_CACHE_LIMIT = 256;
/** The JdbcTemplate we are wrapping */
private final JdbcOperations classicJdbcTemplate;
private volatile int cacheLimit = DEFAULT_CACHE_LIMIT;
/** Cache of original SQL String to ParsedSql representation */
@SuppressWarnings("serial")
private final Map<String, ParsedSql> parsedSqlCache =
new LinkedHashMap<String, ParsedSql>(DEFAULT_CACHE_LIMIT, 0.75f, true) {
@Override
protected boolean removeEldestEntry(Map.Entry<String, ParsedSql> eldest) {
return size() > getCacheLimit();
}
};
/**
* Create a new NamedParameterJdbcTemplate for the given {@link DataSource}.
* <p>Creates a classic Spring {@link org.springframework.jdbc.core.JdbcTemplate} and wraps it.
* @param dataSource the JDBC DataSource to access
*/
public NamedParameterJdbcTemplate(DataSource dataSource) {
Assert.notNull(dataSource, "DataSource must not be null");
this.classicJdbcTemplate = new JdbcTemplate(dataSource);
}
/**
* Create a new NamedParameterJdbcTemplate for the given classic
* Spring {@link org.springframework.jdbc.core.JdbcTemplate}.
* @param classicJdbcTemplate the classic Spring JdbcTemplate to wrap
*/
public NamedParameterJdbcTemplate(JdbcOperations classicJdbcTemplate) {
Assert.notNull(classicJdbcTemplate, "JdbcTemplate must not be null");
this.classicJdbcTemplate = classicJdbcTemplate;
}
/**
* Expose the classic Spring JdbcTemplate to allow invocation of
* less commonly used methods.
*/
@Override
public JdbcOperations getJdbcOperations() {
return this.classicJdbcTemplate;
}
/**
* Specify the maximum number of entries for this template's SQL cache.
* Default is 256.
*/
public void setCacheLimit(int cacheLimit) {
this.cacheLimit = cacheLimit;
}
/**
* Return the maximum number of entries for this template's SQL cache.
*/
public int getCacheLimit() {
return this.cacheLimit;
}
@Override
public <T> T execute(String sql, SqlParameterSource paramSource, PreparedStatementCallback<T> action)
throws DataAccessException {
return getJdbcOperations().execute(getPreparedStatementCreator(sql, paramSource), action);
}
@Override
public <T> T execute(String sql, Map<String, ?> paramMap, PreparedStatementCallback<T> action)
throws DataAccessException {
return execute(sql, new MapSqlParameterSource(paramMap), action);
}
@Override
public <T> T execute(String sql, PreparedStatementCallback<T> action) throws DataAccessException {
return execute(sql, EmptySqlParameterSource.INSTANCE, action);
}
@Override
public <T> T query(String sql, SqlParameterSource paramSource, ResultSetExtractor<T> rse)
throws DataAccessException {
return getJdbcOperations().query(getPreparedStatementCreator(sql, paramSource), rse);
}
@Override
public <T> T query(String sql, Map<String, ?> paramMap, ResultSetExtractor<T> rse)
throws DataAccessException {
return query(sql, new MapSqlParameterSource(paramMap), rse);
}
@Override
public <T> T query(String sql, ResultSetExtractor<T> rse) throws DataAccessException {
return query(sql, EmptySqlParameterSource.INSTANCE, rse);
}
@Override
public void query(String sql, SqlParameterSource paramSource, RowCallbackHandler rch)
throws DataAccessException {
getJdbcOperations().query(getPreparedStatementCreator(sql, paramSource), rch);
}
@Override
public void query(String sql, Map<String, ?> paramMap, RowCallbackHandler rch)
throws DataAccessException {
query(sql, new MapSqlParameterSource(paramMap), rch);
}
@Override
public void query(String sql, RowCallbackHandler rch) throws DataAccessException {
query(sql, EmptySqlParameterSource.INSTANCE, rch);
}
@Override
public <T> List<T> query(String sql, SqlParameterSource paramSource, RowMapper<T> rowMapper)
throws DataAccessException {
return getJdbcOperations().query(getPreparedStatementCreator(sql, paramSource), rowMapper);
}
@Override
public <T> List<T> query(String sql, Map<String, ?> paramMap, RowMapper<T> rowMapper)
throws DataAccessException {
return query(sql, new MapSqlParameterSource(paramMap), rowMapper);
}
@Override
public <T> List<T> query(String sql, RowMapper<T> rowMapper) throws DataAccessException {
return query(sql, EmptySqlParameterSource.INSTANCE, rowMapper);
}
@Override
public <T> T queryForObject(String sql, SqlParameterSource paramSource, RowMapper<T> rowMapper)
throws DataAccessException {
List<T> results = getJdbcOperations().query(getPreparedStatementCreator(sql, paramSource), rowMapper);
return DataAccessUtils.requiredSingleResult(results);
}
@Override
public <T> T queryForObject(String sql, Map<String, ?> paramMap, RowMapper<T>rowMapper)
throws DataAccessException {
return queryForObject(sql, new MapSqlParameterSource(paramMap), rowMapper);
}
@Override
public <T> T queryForObject(String sql, SqlParameterSource paramSource, Class<T> requiredType)
throws DataAccessException {
return queryForObject(sql, paramSource, new SingleColumnRowMapper<>(requiredType));
}
@Override
public <T> T queryForObject(String sql, Map<String, ?> paramMap, Class<T> requiredType)
throws DataAccessException {
return queryForObject(sql, paramMap, new SingleColumnRowMapper<>(requiredType));
}
@Override
public Map<String, Object> queryForMap(String sql, SqlParameterSource paramSource) throws DataAccessException {
return queryForObject(sql, paramSource, new ColumnMapRowMapper());
}
@Override
public Map<String, Object> queryForMap(String sql, Map<String, ?> paramMap) throws DataAccessException {
return queryForObject(sql, paramMap, new ColumnMapRowMapper());
}
@Override
public <T> List<T> queryForList(String sql, SqlParameterSource paramSource, Class<T> elementType)
throws DataAccessException {
return query(sql, paramSource, new SingleColumnRowMapper<>(elementType));
}
@Override
public <T> List<T> queryForList(String sql, Map<String, ?> paramMap, Class<T> elementType)
throws DataAccessException {
return queryForList(sql, new MapSqlParameterSource(paramMap), elementType);
}
@Override
public List<Map<String, Object>> queryForList(String sql, SqlParameterSource paramSource)
throws DataAccessException {
return query(sql, paramSource, new ColumnMapRowMapper());
}
@Override
public List<Map<String, Object>> queryForList(String sql, Map<String, ?> paramMap)
throws DataAccessException {
return queryForList(sql, new MapSqlParameterSource(paramMap));
}
@Override
public SqlRowSet queryForRowSet(String sql, SqlParameterSource paramSource) throws DataAccessException {
return getJdbcOperations().query(
getPreparedStatementCreator(sql, paramSource), new SqlRowSetResultSetExtractor());
}
@Override
public SqlRowSet queryForRowSet(String sql, Map<String, ?> paramMap) throws DataAccessException {
return queryForRowSet(sql, new MapSqlParameterSource(paramMap));
}
@Override
public int update(String sql, SqlParameterSource paramSource) throws DataAccessException {
return getJdbcOperations().update(getPreparedStatementCreator(sql, paramSource));
}
@Override
public int update(String sql, Map<String, ?> paramMap) throws DataAccessException {
return update(sql, new MapSqlParameterSource(paramMap));
}
@Override
public int update(String sql, SqlParameterSource paramSource, KeyHolder generatedKeyHolder)
throws DataAccessException {
return update(sql, paramSource, generatedKeyHolder, null);
}
@Override
public int update(
String sql, SqlParameterSource paramSource, KeyHolder generatedKeyHolder, String[] keyColumnNames)
throws DataAccessException {
ParsedSql parsedSql = getParsedSql(sql);
String sqlToUse = NamedParameterUtils.substituteNamedParameters(parsedSql, paramSource);
Object[] params = NamedParameterUtils.buildValueArray(parsedSql, paramSource, null);
List<SqlParameter> declaredParameters = NamedParameterUtils.buildSqlParameterList(parsedSql, paramSource);
PreparedStatementCreatorFactory pscf = new PreparedStatementCreatorFactory(sqlToUse, declaredParameters);
if (keyColumnNames != null) {
pscf.setGeneratedKeysColumnNames(keyColumnNames);
}
else {
pscf.setReturnGeneratedKeys(true);
}
return getJdbcOperations().update(pscf.newPreparedStatementCreator(params), generatedKeyHolder);
}
@Override
public int[] batchUpdate(String sql, Map<String, ?>[] batchValues) {
SqlParameterSource[] batchArgs = new SqlParameterSource[batchValues.length];
int i = 0;
for (Map<String, ?> values : batchValues) {
batchArgs[i] = new MapSqlParameterSource(values);
i++;
}
return batchUpdate(sql, batchArgs);
}
@Override
public int[] batchUpdate(String sql, SqlParameterSource[] batchArgs) {
ParsedSql parsedSql = getParsedSql(sql);
return NamedParameterBatchUpdateUtils.executeBatchUpdateWithNamedParameters(parsedSql, batchArgs, getJdbcOperations());
}
/**
* Build a PreparedStatementCreator based on the given SQL and named parameters.
* <p>Note: Not used for the {@code update} variant with generated key handling.
* @param sql SQL to execute
* @param paramSource container of arguments to bind
* @return the corresponding PreparedStatementCreator
*/
protected PreparedStatementCreator getPreparedStatementCreator(String sql, SqlParameterSource paramSource) {
ParsedSql parsedSql = getParsedSql(sql);
String sqlToUse = NamedParameterUtils.substituteNamedParameters(parsedSql, paramSource);
Object[] params = NamedParameterUtils.buildValueArray(parsedSql, paramSource, null);
List<SqlParameter> declaredParameters = NamedParameterUtils.buildSqlParameterList(parsedSql, paramSource);
PreparedStatementCreatorFactory pscf = new PreparedStatementCreatorFactory(sqlToUse, declaredParameters);
return pscf.newPreparedStatementCreator(params);
}
/**
* Obtain a parsed representation of the given SQL statement.
* <p>The default implementation uses an LRU cache with an upper limit
* of 256 entries.
* @param sql the original SQL
* @return a representation of the parsed SQL statement
*/
protected ParsedSql getParsedSql(String sql) {
if (getCacheLimit() <= 0) {
return NamedParameterUtils.parseSqlStatement(sql);
}
synchronized (this.parsedSqlCache) {
ParsedSql parsedSql = this.parsedSqlCache.get(sql);
if (parsedSql == null) {
parsedSql = NamedParameterUtils.parseSqlStatement(sql);
this.parsedSqlCache.put(sql, parsedSql);
}
return parsedSql;
}
}
}