Postgres
1. -- 语法 2. cast((字段名->>'数列名') as numeric)/10^18 as 标识名,
直接上示例代码吧
Json源数据
{"Info": {"/": "bafy2bzacebmi36ddo24dq53dgsgocfptediwrdg4b5wqz5ywsinga4oueoi56"}, "FeeDebt": "0", "Sectors": {"/": "bafy2bzacedswlcz5ddgqnyo3sak3jmhmkxashisnlpq6ujgyhe4mlobzpnhs6"}, "Deadlines": {"/": "bafy2bzaceakubxbluycf7ug7ve3o5yg2kwbhjaf65gtu5m4ethfrq2qxurtcy"}, "LockedFunds": "0", "VestingFunds": {"/": "bafy2bzacealbq6s7ptdud6gvpc2yv54opwotncjlqjxmzb2q2rnjxv753rwdc"}, "InitialPledge": "0", "CurrentDeadline": 9, "AllocatedSectors": {"/": "bafy2bzacea456askyutsf7uk4ta2q5aojrlcji4mhaqokbfalgvoq4ueeh4l2"}, "EarlyTerminations": [0], "PreCommitDeposits": "0", "ProvingPeriodStart": 154656, "PreCommittedSectors": {"/": "bafy2bzaceamp42wmmgr2g2ymg46euououzfyck7szknvfacqscohrvaikwfay"}, "PreCommittedSectorsExpiry": {"/": "bafy2bzacedswlcz5ddgqnyo3sak3jmhmkxashisnlpq6ujgyhe4mlobzpnhs6"} }
SELECT epoch, balance/10^18 as balance, available_balance/10^18 AS available_balance, cast((state->>'InitialPledge') as numeric)/10^18 as InitialPledge, cast((state->>'LockedFunds') as numeric)/10^18 as LockedFunds, cast((state->>'PreCommitDeposits') as numeric)/10^18 as PreCommitDeposits, cast((state->>'FeeDebt') as numeric)/10^18 as FeeDebt FROM lotus_miners WHERE actor = 'f02438' ORDER BY epoch DESC LIMIT 1;
