Oralce12的JSON函数

Oracle12以后内置了查询结果转JSON的函数可以对结果进行转换，可以省去在程序中吃内存的操作。
JSON_OBJECT
JSON_OBJECTAGG
JSON_ARRaY
JSON_ARRaYAGG

    SELECT 
    JSON_OBJECT(
        key 'id' value PT_SN || '-' || HIS_INFO_SN, 
        key 'ptName' value  convert( PT_NAME ,  'AL32UTF8' ),
        key 'investors' value  (
                    select JSON_ARRaYAGG(  JSON_OBJECT( 
                        key 'id' value  convert( i.inv_sn ,  'AL32UTF8' ),
                        key 'invName' value convert( i.inv_Name ,  'AL32UTF8' )
                        absent on null
                    )   ) FROM ENTERPRISE_INVESTOR i WHERE i.pt_sn  =  b.pt_sn 
            )
        ,
        key 'organizes' value (
                    select JSON_ARRaYagg(  JSON_OBJECT(
                        key 'id' value  convert( o.INST_SN ,  'AL32UTF8' ),
                        key 'name' value  convert( o.name ,  'AL32UTF8' )
                        absent on null 
                    )) FROM ENTERPRISE_Organize o WHERE o.pt_sn =  b.pt_sn 
            )
        absent on null
)
FROM
        ENTERPRISE_BASEINFO b  where b.pt_sn = 290359

得到结果

{
    "id":"290359-727969",
    "busiScope":"汽车配件、摩托车配件",
    "ptName":"四川省汽车成都供应公司",
    "lastUpdate":"2012-07-07 10:45:37",
    "investors":[
        {
            "id":"2260679",
            "invName":"四川省汽车成都供应公司"
        }
    ],
    "organizes":[
        {
            "id":"3146159",
            "name":"马莉"
        },
        {
            "id":"2385929",
            "name":"马莉"
        }
    ]
}

查询结果乱码：
如果在navicat等工具中查出结果有乱码，尝试将工具的编码修改后再次进行验证。