{"Entry":{"collection":"protocol","key":"functioncall-f","name":"FunctionCall","aliases":["FunctionCall","Byte1('F')"],"metadata":{"aliases":["FunctionCall","Byte1('F')"],"category":"Frontend messages","content_hash":"d6d69a1b8cdf691921d7ea7633df34e042c15ff4b5c247e6ea73112376d83574","derived_content_hash":"81c216d7f823f2e689e76d5841243742c0166fcb2ba4c6d05dd2f7eecbcfa176","imported_at":"2026-09-30T00:40:44.550657+08:00","name":"FunctionCall","name_zh":"","slug":"functioncall-f","summary":"FunctionCall is a frontend protocol message. Identifies the message as a function call."}},"Definition":{"Collection":"protocol","Key":"functioncall-f","SourceDatabase":"center","Version":"18","SourceTable":"protocol_message","SourceKey":"functioncall-f","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"direction":"F","fields":[{"description":"Identifies the message as a function call.","format":"Byte1('F')"},{"description":"Length of message contents in bytes, including self.","format":"Int32"},{"description":"Specifies the object ID of the function to call.","format":"Int32"},{"description":"The number of argument format codes that follow (denoted C below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments.","format":"Int16"},{"description":"The argument format codes. Each must presently be zero (text) or one (binary).","format":"Int16[ C ]"},{"description":"Specifies the number of arguments being supplied to the function.","format":"Int16"},{"description":"The length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case.","format":"Int32"},{"description":"The value of the argument, in the format indicated by the associated format code. n is the above length.","format":"Byte n"},{"description":"The format code for the function result. Must presently be zero (text) or one (binary).","format":"Int16"}]},"comparison_hash":"7b5a4cc17bc0055462741f241298d248129ce3e8e15e476440ae6fb9945662a8","description":["FunctionCall is a frontend protocol message. Identifies the message as a function call."],"description_zh":"Byte1('F') 标识消息为函数调用。 Int32 消息内容的长度（以字节为单位），包括其自身。 Int32 指定要调用的函数的对象 ID。 Int16 后续参数格式代码的数量（以下用 C 表示）。可以为零，表示没有参数，或所有参数都采用默认格式（文本）；也可以为一，表示将指定的格式代码用于所有参数；还可以等于实际参数数量。 Int16[ C ] 参数格式代码。每个目前必须是零（文本）或一（二进制）。 Int16 指定传递给函数的参数数量。 接下来，每个参数都有以下两个字段： Int32 参数值的长度，以字节为单位（不包括此长度字段本身）。可以为零。特殊值 -1 表示 NULL 参数值。为 NULL 时，后面不再有值的字节。 Byte n 参数的值，以相关格式代码指示的格式表示。 n 是上述长度。 最后一个参数之后还有以下字段： Int16 函数结果的格式代码。目前必须为零（文本）或一（二进制）。","description_zh_html":"\u003cp\u003e协议消息 FunctionCall (F)。\u003c/p\u003e\u003ch3\u003e同版本中文手册定义\u003c/h3\u003e\u003cdd\u003e\u003cdiv class=\"variablelist\"\u003e\u003cdl class=\"variablelist\"\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eByte1('F')\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         标识消息为函数调用。\n        \u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         消息内容的长度（以字节为单位），包括其自身。\n        \u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         指定要调用的函数的对象 ID。\n        \u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         后续参数格式代码的数量（以下用 \u003cem class=\"replaceable\"\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e 表示）。可以为零，表示没有参数，或所有参数都采用默认格式（文本）；也可以为一，表示将指定的格式代码用于所有参数；还可以等于实际参数数量。\n        \u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16[\u003cem class=\"replaceable\"\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e]\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         参数格式代码。每个目前必须是零（文本）或一（二进制）。\n        \u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         指定传递给函数的参数数量。\n        \u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e\u003cp\u003e\n      接下来，每个参数都有以下两个字段：\n     \u003c/p\u003e\u003cdiv class=\"variablelist\"\u003e\u003cdl class=\"variablelist\"\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         参数值的长度，以字节为单位（不包括此长度字段本身）。可以为零。特殊值 -1 表示 NULL 参数值。为 NULL 时，后面不再有值的字节。\n        \u003c/p\u003e\u003c/dd\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eByte\u003cem class=\"replaceable\"\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         参数的值，以相关格式代码指示的格式表示。\u003cem class=\"replaceable\"\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e 是上述长度。\n        \u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e\u003cp\u003e\n      最后一个参数之后还有以下字段：\n     \u003c/p\u003e\u003cdiv class=\"variablelist\"\u003e\u003cdl class=\"variablelist\"\u003e\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n         函数结果的格式代码。目前必须为零（文本）或一（二进制）。\n        \u003c/p\u003e\u003c/dd\u003e\u003c/dl\u003e\u003c/div\u003e\u003c/dd\u003e\u003cp\u003e\u003ca href=\"/zh/docs/18/protocol-message-formats.html#PROTOCOL-MESSAGE-FORMATS-FUNCTIONCALL\"\u003e查看完整中文手册与上下文\u003c/a\u003e。\u003c/p\u003e","direction":"F","facts":[{"label":"Direction","value":"Frontend → backend"},{"label":"First wire field","value":"Byte1('F')"},{"label":"Field entries","value":"9"},{"label":"Documented flow contexts","value":"Function Call"}],"facts_zh":[{"label":"方向","value":"前端 → 后端"},{"label":"首个线上协议字段","value":"Byte1('F')"},{"label":"字段条目","value":"9"},{"label":"手册中的交互阶段","value":"函数调用"}],"fields":[{"description":"Identifies the message as a function call.","format":"Byte1('F')"},{"description":"Length of message contents in bytes, including self.","format":"Int32"},{"description":"Specifies the object ID of the function to call.","format":"Int32"},{"description":"The number of argument format codes that follow (denoted C below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments.","format":"Int16"},{"description":"The argument format codes. Each must presently be zero (text) or one (binary).","format":"Int16[ C ]"},{"description":"Specifies the number of arguments being supplied to the function.","format":"Int16"},{"description":"The length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case.","format":"Int32"},{"description":"The value of the argument, in the format indicated by the associated format code. n is the above length.","format":"Byte n"},{"description":"The format code for the function result. Must presently be zero (text) or one (binary).","format":"Int16"}],"manual_html":"\u003cdl\u003e\u003cdd\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eByte1('F')\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIdentifies the message as a function call.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eLength of message contents in bytes, including self.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the object ID of the function to call.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe number of argument format codes that follow (denoted \u003cem class=\"replaceable\"\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16[\u003cem class=\"replaceable\"\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e]\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe argument format codes. Each must presently be zero (text) or one (binary).\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the number of arguments being supplied to the function.\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eNext, the following pair of fields appear for each argument:\u003c/p\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eByte\u003cem class=\"replaceable\"\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe value of the argument, in the format indicated by the associated format code. \u003cem class=\"replaceable\"\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e is the above length.\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eAfter the last argument, the following field appears:\u003c/p\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe format code for the function result. Must presently be zero (text) or one (binary).\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003c/dd\u003e\u003c/dl\u003e","manual_path":"/docs/18/protocol-message-formats.html","related":[{"label":"Protocol flow and exchange examples","url":"/docs/18/protocol-flow.html"},{"label":"Protocol overview","url":"/docs/18/protocol-overview.html"},{"label":"Function Call","url":"/docs/18/protocol-flow.html#PROTOCOL-FLOW-FUNCTION-CALL"}],"release":{"channel":"stable","label":"18.6","major":"18","ref":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2","revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"},"sections":[{"paragraphs":["The complete definition below retains repetition, counts and conditional fields. A numbered table row is a documented field definition, not a fixed byte offset. Integer encodings and flow rules follow the same-version protocol chapter."],"title":"Framing and repetition"}],"sections_zh":[{"paragraphs":["下方完整定义保留重复项、计数与条件字段。表格行号表示文档中的字段定义，并非固定字节偏移量。整数编码与交互流程以同版本协议章节为准。"],"title":"消息边界与重复字段"}],"signature":"FunctionCall (F)","sources":[{"label":"PostgreSQL 18 English manual","path":"protocol-message-formats.html","sha256":"53f37652ac2c089e30ada87d8aee7bdd0f26695b03f275302e526a807d2a1f23","url":"/docs/18/protocol-message-formats.html#PROTOCOL-MESSAGE-FORMATS-FUNCTIONCALL"}],"tables":[{"columns":[{"key":"c0","label":"Position"},{"key":"c1","label":"Format"},{"key":"c2","label":"Meaning"}],"key":"fields","rows":[{"c0":"1","c1":"Byte1('F')","c2":"Identifies the message as a function call."},{"c0":"2","c1":"Int32","c2":"Length of message contents in bytes, including self."},{"c0":"3","c1":"Int32","c2":"Specifies the object ID of the function to call."},{"c0":"4","c1":"Int16","c2":"The number of argument format codes that follow (denoted C below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments."},{"c0":"5","c1":"Int16[ C ]","c2":"The argument format codes. Each must presently be zero (text) or one (binary)."},{"c0":"6","c1":"Int16","c2":"Specifies the number of arguments being supplied to the function."},{"c0":"7","c1":"Int32","c2":"The length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case."},{"c0":"8","c1":"Byte n","c2":"The value of the argument, in the format indicated by the associated format code. n is the above length."},{"c0":"9","c1":"Int16","c2":"The format code for the function result. Must presently be zero (text) or one (binary)."}],"title":"Wire fields in documented order"}],"tables_zh":[{"columns":[{"key":"c0","label":"位置"},{"key":"c1","label":"格式"},{"key":"c2","label":"含义"}],"key":"fields","rows":[{"c0":"1","c1":"Byte1('F')","c2":"标识消息为函数调用。"},{"c0":"2","c1":"Int32","c2":"消息内容的长度（以字节为单位），包括其自身。"},{"c0":"3","c1":"Int32","c2":"指定要调用的函数的对象 ID。"},{"c0":"4","c1":"Int16","c2":"后续参数格式代码的数量（以下用 C 表示）。可以为零，表示没有参数，或所有参数都采用默认格式（文本）；也可以为一，表示将指定的格式代码用于所有参数；还可以等于实际参数数量。"},{"c0":"5","c1":"Int16[ C ]","c2":"参数格式代码。每个目前必须是零（文本）或一（二进制）。"},{"c0":"6","c1":"Int16","c2":"指定传递给函数的参数数量。"},{"c0":"7","c1":"Int32","c2":"参数值的长度，以字节为单位（不包括此长度字段本身）。可以为零。特殊值 -1 表示 NULL 参数值。为 NULL 时，后面不再有值的字节。"},{"c0":"8","c1":"Byte n","c2":"参数的值，以相关格式代码指示的格式表示。 n 是上述长度。"},{"c0":"9","c1":"Int16","c2":"函数结果的格式代码。目前必须为零（文本）或一（二进制）。"}],"title":"按手册顺序排列的线上协议字段"}],"zh_from":{"authored_translation":"source-derived-identity","body_sha256":"efbc67b18d6eab9f50f6ba64d40da632d47593eacd58fc45fcdb9aebc8f4b53a","kind":"same-version-chinese-manual-with-source-derived-identity","manual":{"anchor":"PROTOCOL-MESSAGE-FORMATS-FUNCTIONCALL","build_id":107,"extraction":"exact-definition","fragment_sha256":"f3840bb32f673cbc9c5f07a8b008c2001a03b2331adcbd4c2f01d02c7c5afdc7","locale":"zh-Hans","page_key":"protocol-message-formats.html","source_hash":"0be0a37b38d80c96c157ca9fcfe9222995654664aad8136f7ac2b1b552f6753a","source_revision":"unknown:rendered-translation-baseline","translated_from_revision":null,"translation_revision":"git:b1b500221dbe5437cfca004d6b04d3f6e422765d;html-sha256:08e987a66af27b98444a8057c256314eafa13611a3fb9e888214fc436824244b","url":"/zh/docs/18/protocol-message-formats.html#PROTOCOL-MESSAGE-FORMATS-FUNCTIONCALL","version":"18"},"runtime_rerun":false,"source_facts_revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}},"ManualEvidence":{"manual_path":"/docs/18/protocol-message-formats.html","release":{"channel":"stable","label":"18.6","major":"18","ref":"https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2","revision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"},"sources":[{"label":"PostgreSQL 18 English manual","path":"protocol-message-formats.html","sha256":"53f37652ac2c089e30ada87d8aee7bdd0f26695b03f275302e526a807d2a1f23","url":"/docs/18/protocol-message-formats.html#PROTOCOL-MESSAGE-FORMATS-FUNCTIONCALL"}]},"MeasuredEvidence":{}},"Text":{"Collection":"protocol","Key":"functioncall-f","SourceDatabase":"center","Version":"18","Locale":"en","Title":"FunctionCall","Summary":"FunctionCall is a frontend protocol message. Identifies the message as a function call.","BodyHTML":"\u003cdl\u003e\u003cdd\u003e\n\u003cdiv\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cspan\u003eByte1(\u0026#39;F\u0026#39;)\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIdentifies the message as a function call.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eLength of message contents in bytes, including self.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the object ID of the function to call.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe number of argument format codes that follow (denoted \u003cem\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt16[\u003cem\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e]\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe argument format codes. Each must presently be zero (text) or one (binary).\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the number of arguments being supplied to the function.\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eNext, the following pair of fields appear for each argument:\u003c/p\u003e\n\u003cdiv\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cspan\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eByte\u003cem\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe value of the argument, in the format indicated by the associated format code. \u003cem\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e is the above length.\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eAfter the last argument, the following field appears:\u003c/p\u003e\n\u003cdiv\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cspan\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe format code for the function result. Must presently be zero (text) or one (binary).\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003c/dd\u003e\u003c/dl\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"3bc70d866a15eaa1dba09fd42e9b65ff2c9aac740a2597c84a72aa8b7bc83eb6","Payload":{"description":["FunctionCall is a frontend protocol message. Identifies the message as a function call."],"manual_html":"\u003cdl\u003e\u003cdd\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eByte1('F')\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIdentifies the message as a function call.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eLength of message contents in bytes, including self.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the object ID of the function to call.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe number of argument format codes that follow (denoted \u003cem class=\"replaceable\"\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16[\u003cem class=\"replaceable\"\u003e\u003ccode\u003eC\u003c/code\u003e\u003c/em\u003e]\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe argument format codes. Each must presently be zero (text) or one (binary).\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the number of arguments being supplied to the function.\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eNext, the following pair of fields appear for each argument:\u003c/p\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eByte\u003cem class=\"replaceable\"\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe value of the argument, in the format indicated by the associated format code. \u003cem class=\"replaceable\"\u003e\u003ccode\u003en\u003c/code\u003e\u003c/em\u003e is the above length.\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eAfter the last argument, the following field appears:\u003c/p\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe format code for the function result. Must presently be zero (text) or one (binary).\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003c/dd\u003e\u003c/dl\u003e","related":[{"label":"Protocol flow and exchange examples","url":"/docs/18/protocol-flow.html"},{"label":"Protocol overview","url":"/docs/18/protocol-overview.html"},{"label":"Function Call","url":"/docs/18/protocol-flow.html#PROTOCOL-FLOW-FUNCTION-CALL"}],"sections":[{"paragraphs":["The complete definition below retains repetition, counts and conditional fields. A numbered table row is a documented field definition, not a fixed byte offset. Integer encodings and flow rules follow the same-version protocol chapter."],"title":"Framing and repetition"}],"tables":[{"columns":[{"key":"c0","label":"Position"},{"key":"c1","label":"Format"},{"key":"c2","label":"Meaning"}],"key":"fields","rows":[{"c0":"1","c1":"Byte1('F')","c2":"Identifies the message as a function call."},{"c0":"2","c1":"Int32","c2":"Length of message contents in bytes, including self."},{"c0":"3","c1":"Int32","c2":"Specifies the object ID of the function to call."},{"c0":"4","c1":"Int16","c2":"The number of argument format codes that follow (denoted C below). This can be zero to indicate that there are no arguments or that the arguments all use the default format (text); or one, in which case the specified format code is applied to all arguments; or it can equal the actual number of arguments."},{"c0":"5","c1":"Int16[ C ]","c2":"The argument format codes. Each must presently be zero (text) or one (binary)."},{"c0":"6","c1":"Int16","c2":"Specifies the number of arguments being supplied to the function."},{"c0":"7","c1":"Int32","c2":"The length of the argument value, in bytes (this count does not include itself). Can be zero. As a special case, -1 indicates a NULL argument value. No value bytes follow in the NULL case."},{"c0":"8","c1":"Byte n","c2":"The value of the argument, in the format indicated by the associated format code. n is the above length."},{"c0":"9","c1":"Int16","c2":"The format code for the function result. Must presently be zero (text) or one (binary)."}],"title":"Wire fields in documented order"}]}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}