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功能描述
此方法提取查询结果集的下一行，并返回一个元组。
原型
cursor.fetchone()
参数
无。
返回值
单个元组，为结果集的第一条结果，当没有更多数据可用时，返回为“None”。
示例
请参见示例：常用操作。
cursor.fetchone()
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- DROP MASKING POLICY
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- DROP MODEL
- DROP OPERATOR
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- DROP RESOURCE LABEL
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- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP RULE
- DROP PUBLICATION
- DROP SCHEMA
- DROP SEQUENCE
- DROP SERVER
- DROP SUBSCRIPTION
- DROP SYNONYM
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- DROP TABLESPACE
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- DROP VIEW
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- EXECUTE
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- FETCH
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- INSERT
- LOCK
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- MOVE
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- PREPARE
- PREPARE TRANSACTION
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- SELECT INTO
- SET
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- SHUTDOWN
- SNAPSHOT
- START TRANSACTION
- TIMECAPSULE TABLE
- TRUNCATE
- UPDATE
- VACUUM
- VALUES
- SHRINK
- 数据类型
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- STAT_USER_TABLES
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- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
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- Workload
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- GLOBAL_STATEMENT_COMPLEX_HISTORY
- GLOBAL_STATEMENT_COMPLEX_HISTORY_TABLE
- GLOBAL_STATEMENT_COMPLEX_RUNTIME
- STATEMENT_RESPONSETIME_PERCENTILE
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- STATEMENT_COMPLEX_HISTORY_TABLE
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- STATEMENT_WLMSTAT_COMPLEX_RUNTIME
- STATEMENT_HISTORY
- GS_SLOW_QUERY_INFO（废弃）
- GS_SLOW_QUERY_HISTORY（废弃）
- GLOBAL_SLOW_QUERY_HISTORY（废弃）
- GLOBAL_SLOW_QUERY_INFO（废弃）
- Cache/IO
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
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- STATIO_SYS_SEQUENCES
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- STATIO_ALL_TABLES
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- 查看系统表
- 系统表
- GS_ASP
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- PG_PARTITION
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- PG_RESOURCE_POOL
- PG_REWRITE
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- PG_SECLABEL
- PG_SET
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SHSECLABEL
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- PG_SUBSCRIPTION
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- PG_SYNONYM
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- PG_TS_CONFIG
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- PG_TS_DICT
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- PGXC_CLASS
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- PGXC_NODE
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- 系统视图
- GET_GLOBAL_PREPARED_XACTS（废弃）
- GS_AUDITING
- GS_AUDITING_ACCESS
- GS_AUDITING_PRIVILEGE
- GS_DB_PRIVILEGES
- GS_FILE_STAT
- GS_GSC_MEMORY_DETAIL
- GS_INSTANCE_TIME
- GS_LABELS
- GS_LSC_MEMORY_DETAIL
- GS_MASKING
- GS_MATVIEWS
- GS_OS_RUN_INFO
- GS_REDO_STAT
- GS_SESSION_CPU_STATISTICS
- GS_SESSION_MEMORY
- GS_SESSION_MEMORY_CONTEXT
- GS_SESSION_MEMORY_DETAIL
- GS_SESSION_MEMORY_STATISTICS
- GS_SESSION_STAT
- GS_SESSION_TIME
- GS_SQL_COUNT
- GS_STAT_SESSION_CU
- GS_THREAD_MEMORY_CONTEXT
- GS_TOTAL_MEMORY_DETAIL
- GS_WLM_CGROUP_INFO
- GS_WLM_EC_OPERATOR_STATISTICS
- GS_WLM_OPERATOR_HISTORY
- GS_WLM_OPERATOR_STATISTICS
- GS_WLM_PLAN_OPERATOR_HISTORY
- GS_WLM_REBUILD_USER_RESOURCE_POOL
- GS_WLM_RESOURCE_POOL
- GS_WLM_SESSION_HISTORY
- GS_WLM_SESSION_INFO
- GS_WLM_SESSION_INFO_ALL
- GS_WLM_SESSION_STATISTICS
- GS_WLM_USER_INFO
- MPP_TABLES
- PG_AVAILABLE_Extension_VERSIONS
- PG_AVAILABLE_ExtensionS
- PG_CURSORS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_CONTROL_GROUP_CONFIG
- PG_EXT_STATS
- PG_GET_INVALID_BACKENDS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_GTT_RELSTATS
- PG_GTT_STATS
- PG_GTT_ATTACHED_PIDS
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_PUBLICATION_TABLES
- PG_REPLICATION_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- PG_SESSION_IOSTAT
- PG_SESSION_WLMSTAT
- PG_SETTINGS
- PG_SHADOW
- PG_STATS
- PG_STAT_ACTIVITY
- PG_STAT_ACTIVITY_NG
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_REPLICATION
- PG_STAT_SUBSCRIPTION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_TABLES
- PG_TDE_INFO
- PG_THREAD_WAIT_STATUS
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_USER
- PG_USER_MAPPINGS
- PG_VIEWS
- PG_VARIABLE_INFO
- PG_WLM_STATISTICS
- PGXC_PREPARED_XACTS
- PLAN_TABLE
- 错误码参考
- SQL标准错误码说明
- 第三方库错误码说明
- GAUSS-00001 – GAUSS-00100
- GAUSS-00101 – GAUSS-00200
- GAUSS-00201 – GAUSS-00300
- GAUSS-00301 – GAUSS-00400
- GAUSS-00401 – GAUSS-00500
- GAUSS-00501 – GAUSS-00600
- GAUSS-00601 – GAUSS-00700
- GAUSS-00701 – GAUSS-00800
- GAUSS-00801 – GAUSS-00900
- GAUSS-00901 – GAUSS-01000
- GAUSS-01001 – GAUSS-01100
- GAUSS-01101 – GAUSS-01200
- GAUSS-01201 – GAUSS-01300
- GAUSS-01301 – GAUSS-01400
- GAUSS-01401 – GAUSS-01500
- GAUSS-01501 – GAUSS-01600
- GAUSS-01601 – GAUSS-01700
- GAUSS-01701 – GAUSS-01800
- GAUSS-01801 – GAUSS-01900
- GAUSS-01901 – GAUSS-02000
- GAUSS-02001 – GAUSS-02100
- GAUSS-02101 – GAUSS-02200
- GAUSS-02201 – GAUSS-02300
- GAUSS-02301 – GAUSS-02400
- GAUSS-02401 – GAUSS-02500
- GAUSS-02501 – GAUSS-02600
- GAUSS-02601 – GAUSS-02700
- GAUSS-02701 – GAUSS-02800
- GAUSS-02801 – GAUSS-02900
- GAUSS-02901 – GAUSS-03000
- GAUSS-03001 – GAUSS-03100
- GAUSS-03101 – GAUSS-03200
- GAUSS-03201 – GAUSS-03300
- GAUSS-03301 – GAUSS-03400
- GAUSS-03401 – GAUSS-03500
- GAUSS-03501 – GAUSS-03600
- GAUSS-03601 – GAUSS-03700
- GAUSS-03701 – GAUSS-03800
- GAUSS-03801 – GAUSS-03900
- GAUSS-03901 – GAUSS-04000
- GAUSS-04001 – GAUSS-04100
- GAUSS-04101 – GAUSS-04200
- GAUSS-04201 – GAUSS-04300
- GAUSS-04301 – GAUSS-04400
- GAUSS-04401 – GAUSS-04500
- GAUSS-04501 – GAUSS-04600
- GAUSS-04601 – GAUSS-04700
- GAUSS-04701 – GAUSS-04800
- GAUSS-04801 – GAUSS-04900
- GAUSS-04901 – GAUSS-04999
- GAUSS-05001 – GAUSS-05100
- GAUSS-05101 – GAUSS-05200
- GAUSS-05201– GAUSS-05300
- GAUSS-05301 – GAUSS-05400
- GAUSS-05401 – GAUSS-05500
- GAUSS-05501 – GAUSS-05600
- GAUSS-05601 – GAUSS-05700
- GAUSS-05701 – GAUSS-05800
- GAUSS-05801 – GAUSS-05900
- GAUSS-05901 – GAUSS-06000
- GAUSS-06001 – GAUSS-06100
- GAUSS-06101 – GAUSS-06200
- GAUSS-06201 – GAUSS-06300
- GAUSS-06301 – GAUSS-06400
- GAUSS-06401 – GAUSS-06500
- GAUSS-06501 – GAUSS-06600
- GAUSS-06601 – GAUSS-06700
- GAUSS-06701 – GAUSS-06800
- GAUSS-06801 – GAUSS-06900
- GAUSS-06901 – GAUSS-07000
- GAUSS-07001 – GAUSS-07100
- GAUSS-07101 – GAUSS-07200
- GAUSS-07201 – GAUSS-07300
- GAUSS-07301 – GAUSS-07400
- GAUSS-07401 – GAUSS-07500
- GAUSS-50000 – GAUSS-50999
- GAUSS-51000 – GAUSS-51999
- GAUSS-52000 – GAUSS-52999
- GAUSS-53000 – GAUSS-53999
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