spring SqlReturnType 源码
spring SqlReturnType 代码
文件路径：/spring-jdbc/src/main/java/org/springframework/jdbc/core/SqlReturnType.java
/*
* Copyright 2002-2020 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;
import java.sql.CallableStatement;
import java.sql.SQLException;
import org.springframework.lang.Nullable;
/**
* Interface to be implemented for retrieving values for more complex database-specific
* types not supported by the standard {@code CallableStatement.getObject} method.
*
* <p>Implementations perform the actual work of getting the actual values. They must
* implement the callback method {@code getTypeValue} which can throw SQLExceptions
* that will be caught and translated by the calling code. This callback method has
* access to the underlying Connection via the given CallableStatement object, if that
* should be needed to create any database-specific objects.
*
* @author Thomas Risberg
* @since 1.1
* @see java.sql.Types
* @see java.sql.CallableStatement#getObject
* @see org.springframework.jdbc.object.StoredProcedure#execute(java.util.Map)
*/
public interface SqlReturnType {
/**
* Constant that indicates an unknown (or unspecified) SQL type.
* Passed into setTypeValue if the original operation method does
* not specify an SQL type.
* @see java.sql.Types
* @see JdbcOperations#update(String, Object[])
*/
int TYPE_UNKNOWN = Integer.MIN_VALUE;
/**
* Get the type value from the specific object.
* @param cs the CallableStatement to operate on
* @param paramIndex the index of the parameter for which we need to set the value
* @param sqlType the SQL type of the parameter we are setting
* @param typeName the type name of the parameter (optional)
* @return the target value
* @throws SQLException if an SQLException is encountered setting parameter values
* (that is, there's no need to catch SQLException)
* @see java.sql.Types
* @see java.sql.CallableStatement#getObject
*/
Object getTypeValue(CallableStatement cs, int paramIndex, int sqlType, @Nullable String typeName)
throws SQLException;
}
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