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在MyBatis中,要将LocalDateTime类型映射到数据库字段,需要使用TypeHandler来处理。以下是一个示例:
- 创建一个自定义的TypeHandler来处理LocalDateTime类型的映射
import org.apache.ibatis.type.BaseTypeHandler; import org.apache.ibatis.type.JdbcType; import java.sql.CallableStatement; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.time.LocalDateTime; public class LocalDateTimeTypeHandler extends BaseTypeHandler<LocalDateTime> { @Override public void setNonNullParameter(PreparedStatement ps, int i, LocalDateTime parameter, JdbcType jdbcType) throws SQLException { ps.setTimestamp(i, Timestamp.valueOf(parameter)); } @Override public LocalDateTime getNullableResult(ResultSet rs, String columnName) throws SQLException { Timestamp timestamp = rs.getTimestamp(columnName); if (timestamp != null) { return timestamp.toLocalDateTime(); } return null; } @Override public LocalDateTime getNullableResult(ResultSet rs, int columnIndex) throws SQLException { Timestamp timestamp = rs.getTimestamp(columnIndex); if (timestamp != null) { return timestamp.toLocalDateTime(); } return null; } @Override public LocalDateTime getNullableResult(CallableStatement cs, int columnIndex) throws SQLException { Timestamp timestamp = cs.getTimestamp(columnIndex); if (timestamp != null) { return timestamp.toLocalDateTime(); } return null; } }
- 在MyBatis的配置文件中注册该TypeHandler
<typeHandlers> <typeHandler handler="com.example.LocalDateTimeTypeHandler"/> </typeHandlers>
- 在Mapper.xml文件中使用该TypeHandler
<resultMap id="resultMap" type="com.example.MyEntity"> <id property="id" column="id" jdbcType="BIGINT"/> <result property="createDate" column="create_date" jdbcType="TIMESTAMP" javaType="java.time.LocalDateTime" typeHandler="com.example.LocalDateTimeTypeHandler"/> </resultMap>
这样就可以将LocalDateTime类型映射到数据库字段,并且通过自定义的TypeHandler来处理。