{"Entry":{"collection":"protocol","key":"rowdescription-b","name":"RowDescription","aliases":["RowDescription","Byte1('T')"],"metadata":{"aliases":["RowDescription","Byte1('T')"],"category":"Backend messages","content_hash":"7c57e0ab722b535865f444113865be8198f5c1b9fe63a4f01be2eef2ed92a9b0","imported_at":"2026-09-30T00:40:44.508614+08:00","name":"RowDescription","name_zh":"","slug":"rowdescription-b","summary":"RowDescription is a backend protocol message. Identifies the message as a row description."}},"Definition":{"Collection":"protocol","Key":"rowdescription-b","SourceDatabase":"center","Version":"18","SourceTable":"protocol_message","SourceKey":"rowdescription-b","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","Facts":{"comparison_data":{"direction":"B","fields":[{"description":"Identifies the message as a row description.","format":"Byte1('T')"},{"description":"Length of message contents in bytes, including self.","format":"Int32"},{"description":"Specifies the number of fields in a row (can be zero).","format":"Int16"},{"description":"The field name.","format":"String"},{"description":"If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.","format":"Int32"},{"description":"If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.","format":"Int16"},{"description":"The object ID of the field's data type.","format":"Int32"},{"description":"The data type size (see pg_type.typlen ). Note that negative values denote variable-width types.","format":"Int16"},{"description":"The type modifier (see pg_attribute.atttypmod ). The meaning of the modifier is type-specific.","format":"Int32"},{"description":"The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.","format":"Int16"}]},"comparison_hash":"c9564ef40952fb1d8e6902b417759ad1c7f1cdb53baa6e854aa77b36a730a851","description":["RowDescription is a backend protocol message. Identifies the message as a row description."],"direction":"B","facts":[{"label":"Direction","value":"Backend → frontend"},{"label":"First wire field","value":"Byte1('T')"},{"label":"Field entries","value":"10"},{"label":"Documented flow contexts","value":"Simple Query; Extended Query"}],"fields":[{"description":"Identifies the message as a row description.","format":"Byte1('T')"},{"description":"Length of message contents in bytes, including self.","format":"Int32"},{"description":"Specifies the number of fields in a row (can be zero).","format":"Int16"},{"description":"The field name.","format":"String"},{"description":"If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.","format":"Int32"},{"description":"If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.","format":"Int16"},{"description":"The object ID of the field's data type.","format":"Int32"},{"description":"The data type size (see pg_type.typlen ). Note that negative values denote variable-width types.","format":"Int16"},{"description":"The type modifier (see pg_attribute.atttypmod ). The meaning of the modifier is type-specific.","format":"Int32"},{"description":"The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.","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('T')\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIdentifies the message as a row description.\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\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the number of fields in a row (can be zero).\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eThen, for each field, there is the following:\u003c/p\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eString\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe field name.\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\u003eIf the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.\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\u003eIf the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.\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\u003eThe object ID of the field's data type.\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 data type size (see \u003ccode class=\"varname\"\u003epg_type.typlen\u003c/code\u003e). Note that negative values denote variable-width types.\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\u003eThe type modifier (see \u003ccode class=\"varname\"\u003epg_attribute.atttypmod\u003c/code\u003e). The meaning of the modifier is type-specific.\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 format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.\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":"Simple Query","url":"/docs/18/protocol-flow.html#PROTOCOL-FLOW-SIMPLE-QUERY"},{"label":"Extended Query","url":"/docs/18/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY"}],"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"}],"signature":"RowDescription (B)","sources":[{"label":"PostgreSQL 18 English manual","path":"protocol-message-formats.html","sha256":"53f37652ac2c089e30ada87d8aee7bdd0f26695b03f275302e526a807d2a1f23","url":"/docs/18/protocol-message-formats.html#PROTOCOL-MESSAGE-FORMATS-ROWDESCRIPTION"}],"tables":[{"columns":[{"key":"c0","label":"Position"},{"key":"c1","label":"Format"},{"key":"c2","label":"Meaning"}],"key":"fields","rows":[{"c0":"1","c1":"Byte1('T')","c2":"Identifies the message as a row description."},{"c0":"2","c1":"Int32","c2":"Length of message contents in bytes, including self."},{"c0":"3","c1":"Int16","c2":"Specifies the number of fields in a row (can be zero)."},{"c0":"4","c1":"String","c2":"The field name."},{"c0":"5","c1":"Int32","c2":"If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero."},{"c0":"6","c1":"Int16","c2":"If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero."},{"c0":"7","c1":"Int32","c2":"The object ID of the field's data type."},{"c0":"8","c1":"Int16","c2":"The data type size (see pg_type.typlen ). Note that negative values denote variable-width types."},{"c0":"9","c1":"Int32","c2":"The type modifier (see pg_attribute.atttypmod ). The meaning of the modifier is type-specific."},{"c0":"10","c1":"Int16","c2":"The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero."}],"title":"Wire fields in documented order"}]},"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-ROWDESCRIPTION"}]},"MeasuredEvidence":{}},"Text":{"Collection":"protocol","Key":"rowdescription-b","SourceDatabase":"center","Version":"18","Locale":"en","Title":"RowDescription","Summary":"RowDescription is a backend protocol message. Identifies the message as a row description.","BodyHTML":"\u003cdl\u003e\u003cdd\u003e\n\u003cdiv\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cspan\u003eByte1(\u0026#39;T\u0026#39;)\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIdentifies the message as a row description.\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\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the number of fields in a row (can be zero).\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eThen, for each field, there is the following:\u003c/p\u003e\n\u003cdiv\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cspan\u003eString\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe field name.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIf the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIf the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe object ID of the field\u0026#39;s data type.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe data type size (see \u003ccode\u003epg_type.typlen\u003c/code\u003e). Note that negative values denote variable-width types.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt32\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe type modifier (see \u003ccode\u003epg_attribute.atttypmod\u003c/code\u003e). The meaning of the modifier is type-specific.\u003c/p\u003e\n\u003c/dd\u003e\n\u003cdt\u003e\u003cspan\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.\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":"b5dcc5e27e652b3643b27c984bbeace331a14e2900678458ca729a06aa178c12","Payload":{"description":["RowDescription is a backend protocol message. Identifies the message as a row description."],"manual_html":"\u003cdl\u003e\u003cdd\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eByte1('T')\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eIdentifies the message as a row description.\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\"\u003eInt16\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eSpecifies the number of fields in a row (can be zero).\u003c/p\u003e\n\u003c/dd\u003e\n\u003c/dl\u003e\n\u003c/div\u003e\n\u003cp\u003eThen, for each field, there is the following:\u003c/p\u003e\n\u003cdiv class=\"variablelist\"\u003e\n\u003cdl class=\"variablelist\"\u003e\n\u003cdt\u003e\u003cspan class=\"term\"\u003eString\u003c/span\u003e\u003c/dt\u003e\n\u003cdd\u003e\n\u003cp\u003eThe field name.\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\u003eIf the field can be identified as a column of a specific table, the object ID of the table; otherwise zero.\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\u003eIf the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero.\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\u003eThe object ID of the field's data type.\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 data type size (see \u003ccode class=\"varname\"\u003epg_type.typlen\u003c/code\u003e). Note that negative values denote variable-width types.\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\u003eThe type modifier (see \u003ccode class=\"varname\"\u003epg_attribute.atttypmod\u003c/code\u003e). The meaning of the modifier is type-specific.\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 format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero.\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":"Simple Query","url":"/docs/18/protocol-flow.html#PROTOCOL-FLOW-SIMPLE-QUERY"},{"label":"Extended Query","url":"/docs/18/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY"}],"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('T')","c2":"Identifies the message as a row description."},{"c0":"2","c1":"Int32","c2":"Length of message contents in bytes, including self."},{"c0":"3","c1":"Int16","c2":"Specifies the number of fields in a row (can be zero)."},{"c0":"4","c1":"String","c2":"The field name."},{"c0":"5","c1":"Int32","c2":"If the field can be identified as a column of a specific table, the object ID of the table; otherwise zero."},{"c0":"6","c1":"Int16","c2":"If the field can be identified as a column of a specific table, the attribute number of the column; otherwise zero."},{"c0":"7","c1":"Int32","c2":"The object ID of the field's data type."},{"c0":"8","c1":"Int16","c2":"The data type size (see pg_type.typlen ). Note that negative values denote variable-width types."},{"c0":"9","c1":"Int32","c2":"The type modifier (see pg_attribute.atttypmod ). The meaning of the modifier is type-specific."},{"c0":"10","c1":"Int16","c2":"The format code being used for the field. Currently will be zero (text) or one (binary). In a RowDescription returned from the statement variant of Describe, the format code is not yet known and will always be zero."}],"title":"Wire fields in documented order"}]}},"RequestedLocale":"zh-Hans","Fallback":true,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}