社区微信群开通啦,扫一扫抢先加入社区官方微信群
社区微信群
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!
如果觉得我的文章对您有用,请随意打赏。你的支持将鼓励我继续创作!