1 实例分析 ROWTYPE Postgresql使用plpgsql定义函数时,支持定义行类型,即可以完全继承表的行定义: row1 table1%ROWTYPE; row2 table2%ROWTYPE ; rowtype内部的字段名与表保持严格一致,且在定义后就完全继承表的字段名了。 ROWTYPE实例 从实例结果来看有两点结论: ROWTYPE变量内部字段名不会受结果集影响,与表字段保持一致 ROWTYPE变量内部字段的赋值,是按结果集顺序赋值的,与结果集中的字段名无关 drop ; row2 tf1%ROWTYPE; row3 tf1%ROWTYPE; BEGIN SELECT * INTO row1 from tf1 where c1 > 1; raise notice ROWTYPE用的表的tupledesc,RECORD用 的是SPI返回值的desc:SPI_tuptable->tupdesc %ROWTYPE与RECORD相同点: 都是用PLpgSQL_rec的expand
How to understand differences between ROWTYPE, TYPE, and RECORD in postgresql? ROWTYPE: A variable of a composite type is called a row variable (or row-type variable). last_name, payment; end $$; NOTICE: 1 John Doe has been paid 20.50 USD DO ROWTYPE ----- 1 | join | mal (1 row) postgres=# do $$ declare selected_actor actor%rowtype
DBMS_OUTPUT.PUT_LINE('部门名称:' || V_ORG_NAME); DBMS_OUTPUT.PUT_LINE('上级部门编码:' || TO_CHAR(V_PARENT_ID)); END; 2、%RowType 如果一个表有较多的列,使用%ROWTYPE来定义一个表示表中一行记录的变量,比分别使用%TYPE来定义表示表中各个列的变量要简洁得多,并且不容易遗漏、出错。 为了使一个变量的数据类型与一个表中记录的各个列的数据类型相对应、一致,Oracle提供%ROWTYPE定义方式。 DECLARE V_SF_ORG_REC SF_ORG%ROWTYPE; --与SF_ORG表中的各个列相同 BEGIN SELECT * INTO V_SF_ORG_REC
题目 PL/SQL中的%ROWTYPE和%TYPE的区别是什么? = 1012; COMMIT; DBMS_OUTPUT.PUT_LINE(V_SAL || ',' || V_ENAME || ',' || V_HIREDATE); END; 关于%ROWTYPE ,需要了解以下内容: ① %ROWTYPE返回的是一个记录类型,其数据类型和数据库表的数据结构一致。 ③ 在%ROWTYPE之前加上数据库表名。 ④ 记录内字段名和数据类型与参照表或视图中的列相同。 具体而言,%ROWTYPE有如下优点: ① 可以不必知道数据库中列的数量和类型。 %ROWTYPE使用示例如下所示: DECLARE V_EMP EMP%ROWTYPE; BEGIN SELECT * INTO V_EMP FROM EMP WHERE EMPNO =
addFormSection:section]; // 普通文本 row = [XLFormRowDescriptor formRowDescriptorWithTag:@"username" rowType section addFormRow:row]; // 密码 row = [XLFormRowDescriptor formRowDescriptorWithTag:@"password" rowType addFormSection:section]; // 选择器 row = [XLFormRowDescriptor formRowDescriptorWithTag:@"sex" rowType addFormSection:section]; // 开关 row = [XLFormRowDescriptor formRowDescriptorWithTag:@"enforce" rowType 指定具体的表单类型,该框架提供了非常丰富的rowType,具体可以参考官方文档说明。
, KeyType, KeyField)\ DECLARE_DATA_TABLE_FIND_OR_ADD_METHOD(DataArray, RowType, KeyType, KeyField)\ / , KeyType, KeyField)\ RowType *DataArray##FindRow(KeyType FindBy##KeyField){\ RowType *Ret = nullptr }\ }\ return Ret;\ }\ //前置依赖:Find #define DECLARE_DATA_TABLE_FIND_OR_ADD_METHOD(DataArray, RowType , KeyType, KeyField) \ RowType &DataArray##FindOrAddRow(KeyType In##KeyField){\ RowType *FindRow , KeyType, KeyField)\ DECLARE_DATA_TABLE_FIND_OR_ADD_METHOD(DataArray, RowType, KeyType, KeyField)\
] = db.stream[RowType](aqmQuery.result) // construct akka source val source: Source[RowType,NotUsed ] = Source.fromPublisher[RowType](dbPublisher) 有了dbPublisher就可以用Source.fromPublisher函数构建source了。 我们可以用scalaz-stream-fs2的flatMap来序列化运算两个线程里的enqueue和dequeue: val fs2Stream: Stream[Task,RowType] = Stream.eval(async.boundedQueue[Task,Option[RowType]](16)) .flatMap { q => Task(source.to( ] = db.stream[RowType](aqmQuery.result) // construct akka source val source: Source[RowType,NotUsed
datatypeN [NOT NULL] [ := DEFAULT EXPRESSION]); record_name TYPE_NAME; --定义记录变量名record_name 2.使用%rowtype 定义PL/SQL记录 使用%rowtype时,记录成员名称和类型与所依赖对象(表,视图,游标)名称和类型完全相同 对于表和视图,游标所有列定义时,使用%rowtype定义将大大节省内存空间 record_name table_name%rowtype --基于不同的对象定义PL/SQL记录,此处为表 record_name view_name%rowtype reocrd_name cursor_name% rowtype 二、PL/SQL记录的使用 1. ; --声明基于表dept的记录变量 dept_rec2 dept_cur%ROWTYPE; --声明基于游标dept_cur的记录变量 dept_rec3 dept_type; --声明基于自定义
rowType = (RowType) schema.toSinkRowDataType().notNull().getLogicalType(); // bulk_insert mode rowField = new RowType.RowField("name", new VarCharType(VarCharType.MAX_LENGTH)); RowType.RowField rowField1 = new RowType.RowField("age", new IntType()); RowType.RowField rowField2 = new RowType.RowField ("uuid", new IntType()); RowType.RowField rowField3 = new RowType.RowField("ts", new IntType( rowType = new RowType(rowFields); DataStream<RowData> dataStream = env .addSource
, KeyType, KeyField)\DECLARE\_DATA\_TABLE\_FIND\_OR\_ADD\_METHOD(DataArray, RowType, KeyType, KeyField , KeyType, KeyField)\RowType \*DataArray##FindRow(KeyType FindBy##KeyField){\ RowType \*Ret = nullptr , KeyType, KeyField) \RowType &DataArray##FindOrAddRow(KeyType In##KeyField){\ RowType \*FindRow = DataArray##FindRow(In##KeyField);\ if(FindRow == nullptr){\ RowType Row;\ Row.KeyField , KeyType, KeyField)\DECLARE\_DATA\_TABLE\_FIND\_OR\_ADD\_METHOD(DataArray, RowType, KeyType, KeyField
m_rowType; } 8 set 9 { 10 m_rowType = value; 11 this.ucDataGridView1.RowType = m_rowType; 12 } 13 } 14 15 private List<DataGridViewColumnEntity { return m_rowType; } 22 set 23 { 24 m_rowType = value; 25 this.ucDataGridView1.RowType = m_rowType; 26 } 27 } 28 29 = m_rowType; 17 if (m_dataSource !
DECLARE carry float; cnt int[]; curs4 refcursor; res t_plpgsql_transaction_20230406_01%ROWTYPE DECLARE carry float; cnt int[]; curs4 refcursor; res t_plpgsql_transaction_20230406_01%ROWTYPE DECLARE carry float; cnt int[]; curs4 refcursor; res t_plpgsql_transaction_20230406_01%ROWTYPE DECLARE carry float; cnt int[]; curs4 refcursor; res t_plpgsql_transaction_20230406_01%ROWTYPE DECLARE carry float; cnt int[]; curs4 refcursor; res t_plpgsql_transaction_20230406_01%ROWTYPE
DynamicTableSource.Context context,//ScanRuntimeProviderContext DataType producedDataType) { // 表的字段名和数据类型 final RowType rowType = (RowType) producedDataType.getLogicalType(); final TypeInformation<RowData> rowDataTypeInfo context.createTypeInformation(producedDataType); return new NullRowDataDeserializationSchema( rowType */ private final TimestampFormat timestampFormat; public NullRowDataDeserializationSchema( RowType rowType, TypeInformation<RowData> resultTypeInfo, boolean failOnMissingField, boolean ignoreParseErrors
rowType = (RowType) physicalSchema.toRowDataType().getLogicalType(); TypeInformation<RowData> typeInfo public RowDataDebeziumDeserializeSchema(RowType rowType, TypeInformation<RowData> resultTypeInfo, ValueValidator private DeserializationRuntimeConverter createRowConverter(RowType rowType) { final DeserializationRuntimeConverter [] fieldConverters = rowType.getFields().stream() .map(RowType.RowField::getType) .map(this 在最核心的转换方法中,Flink 通过 rowType.getFieldNames 获取到了 SQL 定义好的 fieldNames,并在后续的转换函数中通过 fieldName 来读取 binlog
rowType = (RowType) dataType.getLogicalType(); TypeInformation<RowData> rowDataTypeInformation context.createTypeInformation(dataType); return new AnalysisJsonDeserializationSchema(rowType ignoreParseErrors; private final int fieldCount; public AnalysisJsonDeserializationSchema(RowType createJsonRowType() { return (RowType) DataTypes.ROW( DataTypes.FIELD("columns createJsonRowType() { return (RowType) DataTypes.ROW( DataTypes.FIELD("columns
定义静态游标 */ */ Cursor emps is Select * from employees where rownum < 6 order by 1; emp employees%rowtype is ref cursor; mycur my_cur_type;--声明引用游标变量 which varchar2(10); deptrow dept%rowtype ; emprow emp%rowtype; begin which := '&请选择dept还是emp'; if (which = 'dept') then 比如:return number是错的,return emp.ename%type也是错的 declare type mycurtype is ref cursor return emp%rowtype ; mycur mycurtype;--声明变量 emprow emp%rowtype; begin open mycur for select * from
四、定义REF CURSOR与声明游标变量示例 --PL/SQL块内声明游标变量 DECLARE TYPE emp_cur_type IS REF CURSOR RETURN emp%ROWTYPE TYPE emp_cur_type IS REF CURSOR -->定义一个游标类型,其返回类型为emp的记录类型 RETURN emp%ROWTYPE ; 五、游标变量使用示例 1、包中使用游标变量 CREATE PACKAGE emp_data AS TYPE empcurtyp IS REF CURSOR RETURN emp%ROWTYPE ; -->产生一个 PL/SQL 320 错误 -- weak_ref_rec dept%ROWTYPE; --> 正确,使用自定义的返回类型 -- weak_ref_rec emp%ROWTYPE; -->如果定义了与返回类型不兼容的类型则在运行时出现异常 -->ORA
实例 函数头中的RETURNS SETOF 函数内部的RETURN NEXT 结果 1 foo foo%rowtype 支持 2 foo record 支持 3 foo foo 支持 4 record foo%rowtype ERROR: materialize mode required, but it is not allowed in this context 5 record record ERROR context 6 record foo ERROR: materialize mode required, but it is not allowed in this context 7 foo%rowtype VALUES (4, 5, 'six'); CREATE OR REPLACE FUNCTION f1() RETURNS SETOF foo AS $BODY$ DECLARE r foo%rowtype VALUES (4, 5, 'six'); CREATE OR REPLACE FUNCTION f4() RETURNS SETOF record AS $BODY$ DECLARE r foo%rowtype
temp.loc := 'gz'; dbms_output.put_line(temp.deptno || ' ' || temp.dname || ' ' || temp.loc); end; 使用rowtype 声明record变量 declare temp dept%rowtype; --temp是一个record变量,数据类型同dept表 begin temp.deptno := 57; temp.dname = 1; --将emp表的第一条记录的sal和ename值赋给对应的变量 dbms_output.put_line(v$sal || ' ' || v$ename); end; sql语句完成rowtype 变量赋值 declare v_row_emp emp%rowtype; begin select * into v_row_emp from emp where empno = 7698;
void GridView1_RowDataBound( object sender, GridViewRowEventArgs e) { if (e.Row.RowType void GridView2_RowDataBound( object sender, GridViewRowEventArgs e) { if (e.Row.RowType void GridView1_RowDataBound( object sender, GridViewRowEventArgs e) { if (e.Row.RowType void gvUserList_RowDataBound( object sender, GridViewRowEventArgs e) { if (e.Row.RowType