/*
* Copyright 2002-2014 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;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.jdbc.support.nativejdbc.NativeJdbcExtractor;
import org.springframework.util.Assert;
/**
* Helper class that efficiently creates multiple {@link PreparedStatementCreator}
* objects with different parameters based on a SQL statement and a single
* set of parameter declarations.
*
* @author Rod Johnson
* @author Thomas Risberg
* @author Juergen Hoeller
*/
public class PreparedStatementCreatorFactory {
/** The SQL, which won't change when the parameters change */
private final String sql;
/** List of SqlParameter objects. May not be {@code null}. */
private final List<SqlParameter> declaredParameters;
private int resultSetType = ResultSet.TYPE_FORWARD_ONLY;
private boolean updatableResults = false;
private boolean returnGeneratedKeys = false;
private String[] generatedKeysColumnNames = null;
private NativeJdbcExtractor nativeJdbcExtractor;
/**
* Create a new factory. Will need to add parameters via the
* {@link #addParameter} method or have no parameters.
*/
public PreparedStatementCreatorFactory(String sql) {
this.sql = sql;
this.declaredParameters = new LinkedList<SqlParameter>();
}
/**
* Create a new factory with the given SQL and JDBC types.
* @param sql SQL to execute
* @param types int array of JDBC types
*/
public PreparedStatementCreatorFactory(String sql, int[] types) {
this.sql = sql;
this.declaredParameters = SqlParameter.sqlTypesToAnonymousParameterList(types);
}
/**
* Create a new factory with the given SQL and parameters.
* @param sql SQL
* @param declaredParameters list of {@link SqlParameter} objects
* @see SqlParameter
*/
public PreparedStatementCreatorFactory(String sql, List<SqlParameter> declaredParameters) {
this.sql = sql;
this.declaredParameters = declaredParameters;
}
/**
* Add a new declared parameter.
* <p>Order of parameter addition is significant.
* @param param the parameter to add to the list of declared parameters
*/
public void addParameter(SqlParameter param) {
this.declaredParameters.add(param);
}
/**
* Set whether to use prepared statements that return a specific type of ResultSet.
* @param resultSetType the ResultSet type
* @see java.sql.ResultSet#TYPE_FORWARD_ONLY
* @see java.sql.ResultSet#TYPE_SCROLL_INSENSITIVE
* @see java.sql.ResultSet#TYPE_SCROLL_SENSITIVE
*/
public void setResultSetType(int resultSetType) {
this.resultSetType = resultSetType;
}
/**
* Set whether to use prepared statements capable of returning updatable ResultSets.
*/
public void setUpdatableResults(boolean updatableResults) {
this.updatableResults = updatableResults;
}
/**
* Set whether prepared statements should be capable of returning auto-generated keys.
*/
public void setReturnGeneratedKeys(boolean returnGeneratedKeys) {
this.returnGeneratedKeys = returnGeneratedKeys;
}
/**
* Set the column names of the auto-generated keys.
*/
public void setGeneratedKeysColumnNames(String[] names) {
this.generatedKeysColumnNames = names;
}
/**
* Specify the NativeJdbcExtractor to use for unwrapping PreparedStatements, if any.
*/
public void setNativeJdbcExtractor(NativeJdbcExtractor nativeJdbcExtractor) {
this.nativeJdbcExtractor = nativeJdbcExtractor;
}
/**
* Return a new PreparedStatementSetter for the given parameters.
* @param params list of parameters (may be {@code null})
*/
public PreparedStatementSetter newPreparedStatementSetter(List<?> params) {
return new PreparedStatementCreatorImpl(params != null ? params : Collections.emptyList());
}
/**
* Return a new PreparedStatementSetter for the given parameters.
* @param params the parameter array (may be {@code null})
*/
public PreparedStatementSetter newPreparedStatementSetter(Object[] params) {
return new PreparedStatementCreatorImpl(params != null ? Arrays.asList(params) : Collections.emptyList());
}
/**
* Return a new PreparedStatementCreator for the given parameters.
* @param params list of parameters (may be {@code null})
*/
public PreparedStatementCreator newPreparedStatementCreator(List<?> params) {
return new PreparedStatementCreatorImpl(params != null ? params : Collections.emptyList());
}
/**
* Return a new PreparedStatementCreator for the given parameters.
* @param params the parameter array (may be {@code null})
*/
public PreparedStatementCreator newPreparedStatementCreator(Object[] params) {
return new PreparedStatementCreatorImpl(params != null ? Arrays.asList(params) : Collections.emptyList());
}
/**
* Return a new PreparedStatementCreator for the given parameters.
* @param sqlToUse the actual SQL statement to use (if different from
* the factory's, for example because of named parameter expanding)
* @param params the parameter array (may be {@code null})
*/
public PreparedStatementCreator newPreparedStatementCreator(String sqlToUse, Object[] params) {
return new PreparedStatementCreatorImpl(
sqlToUse, params != null ? Arrays.asList(params) : Collections.emptyList());
}
/**
* PreparedStatementCreator implementation returned by this class.
*/
private class PreparedStatementCreatorImpl
implements PreparedStatementCreator, PreparedStatementSetter, SqlProvider, ParameterDisposer {
private final String actualSql;
private final List<?> parameters;
public PreparedStatementCreatorImpl(List<?> parameters) {
this(sql, parameters);
}
public PreparedStatementCreatorImpl(String actualSql, List<?> parameters) {
this.actualSql = actualSql;
Assert.notNull(parameters, "Parameters List must not be null");
this.parameters = parameters;
if (this.parameters.size() != declaredParameters.size()) {
// account for named parameters being used multiple times
Set<String> names = new HashSet<String>();
for (int i = 0; i < parameters.size(); i++) {
Object param = parameters.get(i);
if (param instanceof SqlParameterValue) {
names.add(((SqlParameterValue) param).getName());
}
else {
names.add("Parameter #" + i);
}
}
if (names.size() != declaredParameters.size()) {
throw new InvalidDataAccessApiUsageException(
"SQL [" + sql + "]: given " + names.size() +
" parameters but expected " + declaredParameters.size());
}
}
}
@Override
public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
PreparedStatement ps;
if (generatedKeysColumnNames != null || returnGeneratedKeys) {
if (generatedKeysColumnNames != null) {
ps = con.prepareStatement(this.actualSql, generatedKeysColumnNames);
}
else {
ps = con.prepareStatement(this.actualSql, PreparedStatement.RETURN_GENERATED_KEYS);
}
}
else if (resultSetType == ResultSet.TYPE_FORWARD_ONLY && !updatableResults) {
ps = con.prepareStatement(this.actualSql);
}
else {
ps = con.prepareStatement(this.actualSql, resultSetType,
updatableResults ? ResultSet.CONCUR_UPDATABLE : ResultSet.CONCUR_READ_ONLY);
}
setValues(ps);
return ps;
}
@Override
public void setValues(PreparedStatement ps) throws SQLException {
// Determine PreparedStatement to pass to custom types.
PreparedStatement psToUse = ps;
if (nativeJdbcExtractor != null) {
psToUse = nativeJdbcExtractor.getNativePreparedStatement(ps);
}
// Set arguments: Does nothing if there are no parameters.
int sqlColIndx = 1;
for (int i = 0; i < this.parameters.size(); i++) {
Object in = this.parameters.get(i);
SqlParameter declaredParameter;
// SqlParameterValue overrides declared parameter metadata, in particular for
// independence from the declared parameter position in case of named parameters.
if (in instanceof SqlParameterValue) {
SqlParameterValue paramValue = (SqlParameterValue) in;
in = paramValue.getValue();
declaredParameter = paramValue;
}
else {
if (declaredParameters.size() <= i) {
throw new InvalidDataAccessApiUsageException(
"SQL [" + sql + "]: unable to access parameter number " + (i + 1) +
" given only " + declaredParameters.size() + " parameters");
}
declaredParameter = declaredParameters.get(i);
}
if (in instanceof Collection && declaredParameter.getSqlType() != Types.ARRAY) {
Collection<?> entries = (Collection<?>) in;
for (Object entry : entries) {
if (entry instanceof Object[]) {
Object[] valueArray = ((Object[])entry);
for (Object argValue : valueArray) {
StatementCreatorUtils.setParameterValue(psToUse, sqlColIndx++, declaredParameter, argValue);
}
}
else {
StatementCreatorUtils.setParameterValue(psToUse, sqlColIndx++, declaredParameter, entry);
}
}
}
else {
StatementCreatorUtils.setParameterValue(psToUse, sqlColIndx++, declaredParameter, in);
}
}
}
@Override
public String getSql() {
return sql;
}
@Override
public void cleanupParameters() {
StatementCreatorUtils.cleanupParameters(this.parameters);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("PreparedStatementCreatorFactory.PreparedStatementCreatorImpl: sql=[");
sb.append(sql).append("]; parameters=").append(this.parameters);
return sb.toString();
}
}
}
