看一下下面这张表的mysql.columns表和mysql.column_type_elements信息。为了缩短显示长度,这里只展示几个重要的值。 #建表: CREATETABLEt1(idintnotnullauto_incrementprimarykey,col1 number,col2VARCHAR(100),col3 pls_integer, col4 enum('x','y')def
...在Table中创建的Column,如果使用Identity属性标识,那么该列是ID列。默认情况下,不能显式向ID列插入数值。...如果想要显式向ID列插入特定的数值,那么,必须启用 Identity_Insert选项,该选项自动将ID值更新为ID列的最大值。 2.2K00 MSSQL之二 Sql Server中管理库与表...
CREATE TABLE命令用于创建一个新的数据表,它的用法如下: createtabletable_name(column1 datatype,column2 datatype,column3 datatype,...columnN datatype,primarykey(oneormorecolumns)); 实例 createtablewebsite(idintNOTNULLAUTO_INCREMENTcomment'用户的id,手机号码',nameVARCHAR(20)NOTNULL,urlVARCHAR(30)DEFA...
ColumnType ColumnWithSortOrder CommandOptions CommandSecurityElement80 CommitTransactionStatement CommonTableExpression CompositeGroupingSpecification CompressionDelayIndexOption CompressionDelayTimeUnit CompressionEndpointProtocolOption CompressionPartitionRange ComputeClause ComputeFunction ComputeFunctionType ConstraintDefinition ...
from sqlalchemy import MetaData from sqlalchemy import Table, Column, Integer, String from sqlalchemy.dialects.mysql import VARCHAR metadata_obj = MetaData() user = Table( "user", metadata_obj, Column("user_name", String(100), primary_key=True), Column( "bio", String(255).with_variant(...
ColumnWithSortOrder CommandOptions CommandSecurityElement80 CommitTransactionStatement CommonTableExpression CompositeGroupingSpecification CompressionDelayIndexOption CompressionDelayTimeUnit CompressionEndpointProtocolOption CompressionPartitionRange ComputeClause ComputeFunction ComputeFunctionType ConstraintDefinition ConstraintEnfo...
Enum:枚举类型。指定某个字段只能是枚举中指定的几个值,不能为其他值。在ORM模型中,使用Enum来作为枚举,示例代码如下: class Article(Base): __tablename__ = 'article' id = Column(Integer,primary_key=True,autoincrement=True) tag = Column(Enum("python",'flask','django')) ...
(svr, "TESTDB"); db.Create(); // PK Table Table tab1 = new Table(db, "Table1"); // Define Columns and add them to the table Column col1 = new Column(tab1, "Col1", DataType.Int); col1.Nullable = false; tab1.Columns.Add(col1); Column col2 = new Column(tab1, "Col2...
当以“内联”方式使用Enum或ENUM时,将发出CREATE TYPE和DROP TYPE,对应于调用Table.create()和Table.drop()方法时: table = Table('sometable', metadata, Column('some_enum', ENUM('a', 'b', 'c', name='myenum')) ) table.create(engine) # will emit CREATE ENUM and CREATE TABLE table.drop(...
stmtTableCache = stmtTableCache; this.queryCtx = queryCtx; this.authzFactory = authzFactory; this.lineageGraph = new ColumnLineageGraph(); List<ExprRewriteRule> rules = new ArrayList<>(); // BetweenPredicates must be rewritten to be executable. Other non-essential // expr rewrites can be ...