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pgsql中处理数组类型字段

article 2025/1/23 2:09:35

1、代码中存入和读取
需要使用自定义转换器

@Slf4j
public class ArrayTypeHandler extends BaseTypeHandler<List<String>> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, List<String> parameter, JdbcType jdbcType)
            throws SQLException {
        Object[] objects = parameter.toArray();
        Array array = ps.getConnection().createArrayOf("varchar", objects);
        ps.setArray(i, array);
    }

    @Override
    public List<String> getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return getArray(rs.getArray(columnName));
    }


    @Override
    public List<String> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return getArray(rs.getArray(columnIndex));
    }


    @Override
    public List<String> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return getArray(cs.getArray(columnIndex));
    }

    private List<String> getArray(Array array) {

        if (array == null) {
            return null;
        }

        try {
            String[] objects = (String[]) array.getArray();
            return Arrays.asList(objects);
        } catch (SQLException e) {
            log.error("sql转换失败");
        }
        return null;
    }
}

本项目使用的ORM框架是mybatis-flex 在字段上添加注解

@Column(jdbcType = JdbcType.ARRAY,typeHandler = ArrayTypeHandler.class)
    private List<String> swlToCnIds;

然后正常插入、查询即可

2、sql中使用数组属性字段

使用any函数

// 是否包含
value = ANY(array)
// 是否有大于值
value > ANY(array)
// 小于同理
value < ANY(array)
// 是否有不等于的
value <> ANY(array)

any和关联查询一起使用

SELECT 
    b.*,string_agg(DISTINCT s1.name, ',' order by s1.name) as sw_to_bts,string_agg(DISTINCT s2.name,',' order by s2.name) as sw_to_cn
FROM 
    t_ne_mgr_bsc b
LEFT JOIN 
    t_ne_switch_mgr s1 ON s1.id = ANY(b.swl_to_bts_ids)
LEFT JOIN 
    t_ne_switch_mgr s2 ON s2.id = ANY(b.swl_to_cn_ids)
WHERE 
    b.removed = false
group by b.id