开始位置[ , 出现次数]]) 例∶ INSTR (‘this is a test’ , ‘i’ , 1,2)=6 INITCAP---将字符串每个单词首字母均变为大写 例: INITCAP(‘this is a test’)=’ This Is A Test’’ LENGTH---计算串长 格式∶ LENGTH(string) RPAD,LPAD---右填充、左填充。默认...
application_name is '应用名(客户端名)'; drop foreign table if exists pg_log_tue; create foreign table pg_log_tue( log_time timestamp ,user_name text ,database_name text ,process_id integer ,connection_from text ,session_id text ,session_line_num bigint ,command_tag text ,session_...
{ "numeric_value_out_of_range", ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE }, { "sequence_generator_limit_exceeded", ERRCODE_SEQUENCE_GENERATOR_LIMIT_EXCEEDED }, { "string_data_length_mismatch", ERRCODE_STRING_DATA_LENGTH_MISMATCH }, { "string_data_right_truncation", ERRCODE_STRING_DATA_RIGHT_...
logging_collector = on # 这个参数启用日志收集器,它是一个捕捉被发送到stderr的日志消息的后台进程,并且它会将这些消息重定向到日志文件中。 # into log files. Required to be on for # csvlogs. # (需要重启生效) # These are only used if logging_collector is on: log_directory = '/pglogs/pg_...
# "local" is for Unix domain socket connections only local all all trust # IPv4 local connections: host all all 127.0.0.1/32 trust host all all ::1/128 trust 生成密钥文件(建议在一个节点上修改完再发到其他节点) echo 'some string' > ~/.pgpoolkey ...
standard_planner(Query *parse, const char *query_string, int cursorOptions, ParamListInfo boundParams) { ... /* Determine what fraction of the plan is likely to be scanned */ if (cursorOptions & CURSOR_OPT_FAST_PLAN) { /* * We have no real idea how many tuples the user will ultim...
#escape_string_warning = on #lo_compat_privileges = off #operator_precedence_warning = off #quote_all_identifiers = off #standard_conforming_strings = on #synchronize_seqscans = on 2.4.2 其他平台和客户(Other Platforms and Client) #transform_null_equals = off ...
A null value is treated as an empty string. I treats the argument value as an SQL identifier, double-quoting it if necessary. It is an error for the value to be null (equivalent to quote_ident). L quotes the argument value as an SQL literal. A null value is displayed as the string...
PATH LINESTRING - POLYGON POLYGON - CIRCLE POLYGON A POLYGON is used to approximate a CIRCLE TXID_SNAPSHOT VARCHAR - PostgreSQL还有很多类型,上面并没有列出来,比如图像,化学,raster, 基因等。 MySQL类型 转换为 PostgreSQL类型 取自mysql_fdw插件的代码 http://api.pgxn.org/src/mysql_fdw/mysql_fdw-2.1...
escape_string_warning - 警告普通字符串字面量中存在反斜杠转义符 exit_on_error - 发生任何错误时终止会话 extra_float_digits - 设置要为浮点值显示的位数 force_parallel_mode - 强制使用并行查询工具 from_collapse_limit - 设置 FROM 列表大小,超过该大小时将不会折叠子查询 geqo - 启用基因查询优化 geqo_...