Class OptionalColumnMapper

java.lang.Object

org.huiche.jdbc.mapper.column.OptionalColumnMapper

All Implemented Interfaces:

ColumnMapper<Optional<?>>

public final class OptionalColumnMapper
extends Object
implements ColumnMapper<Optional<?>>

Optional 列转换器, 注意此转换器内部判断是否Optional类型

Author:

Maning

Field Summary

Fields

Modifier and Type	Field	Description
static final OptionalColumnMapper	INSTANCE	单例

Method Summary

Modifier and Type	Method	Description
boolean	canRead(Type type, Configuration configuration)	是否可读
Optional<?>	read(ResultSet rs, int columnIndex, Type type, Configuration configuration)	从ResultSet读取值,请确保安全或已使用ColumnMapper.canRead(Type, Configuration) 测试
boolean	write(PreparedStatement ps, int parameterIndex, Optional<?> value, Configuration configuration)	写入值到PreparedStatement

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

INSTANCE

public static final OptionalColumnMapper INSTANCE

单例

Method Details

canRead

public boolean canRead(Type type,
 Configuration configuration)

Description copied from interface: ColumnMapper

是否可读

Specified by:

canRead in interface ColumnMapper<Optional<?>>

Parameters:

type - 类型

configuration - 配置

Returns:

是否可读

read

public Optional<?> read(ResultSet rs,
 int columnIndex,
 Type type,
 Configuration configuration)
                 throws SQLException

Description copied from interface: ColumnMapper

从ResultSet读取值,请确保安全或已使用ColumnMapper.canRead(Type, Configuration) 测试

Specified by:

read in interface ColumnMapper<Optional<?>>

Parameters:

rs - 结果集

columnIndex - rs使用的columnIndex, 从1开始

type - 类型

configuration - 配置

Returns:

值 允许返回null

Throws:

SQLException - 原生SQL异常

write

public boolean write(PreparedStatement ps,
 int parameterIndex,
 Optional<?> value,
 Configuration configuration)
              throws SQLException

Description copied from interface: ColumnMapper

写入值到PreparedStatement

Specified by:

write in interface ColumnMapper<Optional<?>>

Parameters:

ps - PreparedStatement

parameterIndex - ps使用的parameterIndex,从1开始

value - 值,不会为null

configuration - 配置

Returns:

是否已写入

Throws:

SQLException - 原生SQL异常