springboot~mybatis枚举映射

在mybatis和mybatis plus里，如果你的实体字段是一个枚举类型，而在数据表里是整型，这时在存储时需要进行处理，默认情况下，会把枚举的元素名称拼接到SQL语句里，而由于数据表是int类型，所以在插入等操作时，就会出现异常！

MappedTypes(value = {YesOrNo.class}) public class UniversalEnumHandler<E extends Enum<E> & BaseEnum> extends BaseTypeHandler<E> {    private final Class<E> type;    /**    * construct with parameter.    */   public UniversalEnumHandler(Class<E> type) {     if (type == null) {       throw new IllegalArgumentException("Type argument cannot be null");     }     this.type = type;   }    @Override   public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType)       throws SQLException {     ps.setInt(i, parameter.getCode());   }    @Override   public E getNullableResult(ResultSet rs, String columnName) throws SQLException {     int code = rs.getInt(columnName);     return rs.wasNull() ? null : EnumUtils.codeOf(this.type, code);   }    @Override   public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {     int code = rs.getInt(columnIndex);     return rs.wasNull() ? null : EnumUtils.codeOf(this.type, code);   }    @Override   public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {     int code = cs.getInt(columnIndex);     return cs.wasNull() ? null : EnumUtils.codeOf(this.type, code);   } }

mybatis-plus:   typeHandlersPackage: cn.pilipa.account.cerebrum.client.enums #处理器所在包，我是把枚举处理器放在枚举包里

public interface BaseEnum<E extends Enum<?>, T> {    public Integer getCode();    public String getText(); }

public enum YesOrNo implements BaseEnum {   Yes(1, "是"),   No(0, "否");   private Integer code;   private String text;    YesOrNo(Integer code, String text) {     this.code = code;     this.text = text;   }    @JsonCreator   public static YesOrNo jsonCreate(Integer code) {     return EnumUtils.codeOf(YesOrNo.class, code);   }    @Override   public Integer getCode() {     return this.code;   }    @Override   public String getText() {     return this.text;   }    @JsonValue   public Integer getCodeStr() {     return this.code;   }  }

  /**    * 是否为国民.    */   private YesOrNo naturalBorn;

 ==>  Preparing: INSERT INTO employee_info ( id, name, credit_number, status, first_time, tax_code, natural_born ) VALUES ( ?, ?, ?, ?, ?, ?, ? )  2019-09-05 16:56:38.991 DEBUG [accounting-client,,,] 92833 --- [           main] c.p.a.c.c.m.EmployeeInfoMapper.insert    :  ==> Parameters: 1169534796253630466(Long), 段会涛(String), 130523199011111219(String), 1(Integer), 2019-09-05(Date), 130523199011111219(String), 0(Integer)

从上面结果中看到，我们的natural_born对应的值已经是int类型了，表示处理器成功了！

来源：博客园

作者：张占岭

链接：https://www.cnblogs.com/lori/p/11468268.html