Please expose original database column type at least as string. this is currently so restricting on this package. this will help us to do some level dynamic column value parsingjosharian changed the title database/sql - database original column type database/sql: expose database original ...
(1) 创建数据库 CREATE DATABASE database_name (2) 删除数据库 DROP DATABASE database_name (3) 创建表 CREATE TABLE table_name (column_name column_type) (4) 删除表 DROP TABLE table_name (5) 添加表字段 ALTER TABLE table_name ADD new_column DATATYPE (6) 修改表字段类型 ALTER TABLE table...
第二个选择是:用java.sql.DatabaseMetaData.getTypeInfo方法来找出给定的数据库实际上支持哪些 SQL 类型,然后选择与给定 JDBC 类型相匹配的特定于数据库的 SQL 类型名。 JDBC 定义了一个从 JDBC 数据库类型到 Java 类型的标准映射。例如,JDBC 的INTEGER类型通常映射为 Java 的int类型。这可支持简单的接口,将 JDBC...
SELECT TABLE_SCHEMA dataBaseName -- 库名 ,TABLE_NAME tableName -- 表名 , COLUMN_NAME columnName -- 列名 , COLUMN_KEY columnConstraint -- 列限制 主键,唯一之类的 , COLUMN_COMMENT columnComment -- 列注释 , DATA_TYPE columnType -- 字段类型 varchar之类的 , CHARACTER_MAXIMUM_LENGTH columnLeng...
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 ...
column1_name,column2_name,column3_name,...are the names of the columns datatype1,datatype2,datatype3,...are the data types such asINTEGER,TEXT, etc. to be stored in the respective columns Note:The supported data types can vary across different database systems, which means that not al...
col3: This column is of the CLOB (Character Large Object) data type. CLOB columns are used to store very large strings, typically exceeding the maximum length allowed by VARCHAR. DBMS Character String Types: Boolean Type: The data type boolean comprises the distinct truth values true and false...
DatabaseColumn.ColumnType Property Reference Feedback Definition Namespace: Microsoft.Azure.Management.Sql.Models Assembly: Microsoft.Azure.Management.Sql.dll Package: Microsoft.Azure.Management.Sql v3.1.0-preview Gets or sets the column data type. Possible values include: 'image', 'text', '...
ALTER TABLE 管理 COLUMN ALTER TABLE 管理 PARTITION ALTER TABLE 或 CREATE TABLE .. MASK 子句 ALTER TABLE 或 CREATE TABLE .. ROW FILTER 條款 ALTER VIEW ALTER VOLUME COMMENT ON CREATE CATALOG CREATE CONNECTION CREATE DATABASE CREATE FUNCTION (SQL) CREATE FUNCTION (外部) 創建地點 CREATE MATERIALIZED...
1mysql>altertabletestdropcolumnaddr;2Query OK,0rows affected (0.01sec)3Records:0Duplicates:0Warnings:0 删除主键: mysql>altertabletestdropprimarykey; Query OK,0rows affected (0.01sec) Records:0Duplicates:0Warnings:0 添加主键: 1mysql>altertabletestaddprimarykey(id);2Query OK,0rows affected (0.01...