spring EmptySqlParameterSource 源码
spring EmptySqlParameterSource 代码
文件路径：/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/EmptySqlParameterSource.java
/*
* Copyright 2002-2018 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
*
* https://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 org.springframework.lang.Nullable;
/**
* A simple empty implementation of the {@link SqlParameterSource} interface.
*
* @author Juergen Hoeller
* @since 3.2.2
*/
public class EmptySqlParameterSource implements SqlParameterSource {
/**
* A shared instance of {@link EmptySqlParameterSource}.
*/
public static final EmptySqlParameterSource INSTANCE = new EmptySqlParameterSource();
@Override
public boolean hasValue(String paramName) {
return false;
}
@Override
@Nullable
public Object getValue(String paramName) throws IllegalArgumentException {
throw new IllegalArgumentException("This SqlParameterSource is empty");
}
@Override
public int getSqlType(String paramName) {
return TYPE_UNKNOWN;
}
@Override
@Nullable
public String getTypeName(String paramName) {
return null;
}
@Override
@Nullable
public String[] getParameterNames() {
return null;
}
}
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