spring BindMarker 源码
spring BindMarker 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/binding/BindMarker.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.r2dbc.core.binding;
import io.r2dbc.spi.Statement;
/**
* A bind marker represents a single bindable parameter within a query.
* Bind markers are dialect-specific and provide a
* {@link #getPlaceholder() placeholder} that is used in the actual query.
*
* @author Mark Paluch
* @since 5.3
* @see Statement#bind
* @see BindMarkers
* @see BindMarkersFactory
*/
public interface BindMarker {
/**
* Return the database-specific placeholder for a given substitution.
*/
String getPlaceholder();
/**
* Bind the given {@code value} to the {@link Statement} using the underlying binding strategy.
* @param bindTarget the target to bind the value to
* @param value the actual value (must not be {@code null};
* use {@link #bindNull(BindTarget, Class)} for {@code null} values)
* @see Statement#bind
*/
void bind(BindTarget bindTarget, Object value);
/**
* Bind a {@code null} value to the {@link Statement} using the underlying binding strategy.
* @param bindTarget the target to bind the value to
* @param valueType the value type (must not be {@code null})
* @see Statement#bindNull
*/
void bindNull(BindTarget bindTarget, Class<?> valueType);
}
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