Table API中的数据类型 Java/Scala 在基于JVM的API中,用户在Table API中使用org.apache.flink.table.types.DataType的实例,或者在定义连接器、目录或用户定义函数时使用。 DataType实例有两个职责: 声明一个逻辑类型,它不会暗示传输或存储的具体物理表示,但定义了基于JVM/Python语言和表生态系统之间的边界。 可选:...
Example : A table using numeric data types-- Creating a new table named "test" in the current schema CREATE TABLE test ( -- Defining a column named "id" of the DECIMAL data type, designated as the PRIMARY KEY id DECIMAL PRIMARY KEY, -- Defining a column named "name" of the VARCHAR ...
The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. SQL Data Types Each column in a database table is required to have a name and a data type. An SQL developer must decide what type of data that will be ...
The syntax for SQL Data Types is: CREATETABLEtable_name ( column1_name datatype1, column2_name datatype2, column3_name datatype3, ... ); Here, column1_name,column2_name,column3_name,...are the names of the columns datatype1,datatype2,datatype3,...are the data types such asINT...
8、Other Data Types 1)BOOLEAN 2)、RAW 3)、NULL 三、类型转换 1、CAST 方法 2、旧版本 CAST 方法 四、数据类型提取 本文基于flink1.17版本,介绍了flink的数据类型的全部内容,包含数据类型定义、自定义数据类型、类型转换与提取。 本文全部是说明性的,为后续的table api和sql使用奠定基础。
基础类型,Flink 可以通过反射类型信息自动把数据类型获取到 // 关于 SQL 类型和 Java 类型之间的映射见:https://nightlies.apache.org/flink/flink-docs-release-1.13/docs/dev/table/types/#data-type-extraction public int age; public String name; // 2. 复杂类型,用户可以通过 @DataTypeHint("DECIMAL(10...
importorg.apache.flink.table.api.bridge.java.StreamTableEnvironment; importorg.apache.flink.types.Row; importstaticorg.apache.flink.table.api.Expressions.$; /** * 使用TableAPI的基本套路: * 1.创建表的执行环境 * 2.创建表,将流转换为动态表,表的字段名从bean的属性名自动抽取 ...
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// 关于SQL类型和Java类型之间的映射见:https://nightlies.apache.org/flink/flink-docs-release-1.13/docs/dev/table/types/#data-type-extractionpublicintage;publicStringname; //2.复杂类型,用户可以通过@DataTypeHint("DECIMAL(10, 2)") 注解标注此字段的数据类型public@DataTypeHint("DECIMAL(10, 2)")Big...
InfluxDB Cloud Serverless uses theApache Arrow DataFusionimplementation of SQL. Data types define the type of values that can be stored in table columns. In InfluxDB’s SQL implementation, ameasurementis structured as a table, andtags,fieldsandtimestampsare exposed as columns. ...