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语法
create table [IF NOT EXISTS] 表名 (
字段名 类型 [约束条件],
字段名 类型 [约束条件],
字段名 类型 [约束条件],
字段名 类型 [约束条件]
);
- 字段定义在括号内
- 约束条件可以有多个
- 多个字段定义之间用都会隔开
常见约束
- NOT NULL 非空
- DEFAULT 0 默认值
- AUTO_INCREMENT 自增长
- PRIMARY KEY 主键
示例
create table if not exists t_one (id bigint(20) UNSIGNED NOT NULL auto_increment primary key COMMENT '主键',name varchar(64) COMMENT '名称',age int(10) COMMENT '仙人寿命'
) engine=innoDB default charset=utf8mb4;
Jsqlparser创建建表语句
引入依赖
<dependency><groupId>com.github.jsqlparser</groupId><artifactId>jsqlparser</artifactId><version>4.3</version></dependency>
Demo
import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.create.table.ColDataType;
import net.sf.jsqlparser.statement.create.table.ColumnDefinition;
import net.sf.jsqlparser.statement.create.table.CreateTable;import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;public class CreateTableDemo {public static void main(String[] args)throws Exception {CreateTable createTable = new CreateTable();// 设置表名Table table = new Table("t_one");createTable.setTable(table);// 定义字段// idColDataType bigint = new ColDataType("BIGINT");bigint.setArgumentsStringList(Collections.singletonList("20"));ColumnDefinition id = new ColumnDefinition("id", bigint);id.setColumnSpecs(Arrays.asList("UNSIGNED", "NOT NULL", "PRIMARY KEY", "AUTO_INCREMENT", "COMMENT '主键'"));// nameColDataType varchar = new ColDataType("VARCHAR");varchar.setArgumentsStringList(Collections.singletonList("64"));ColumnDefinition name = new ColumnDefinition("name", varchar);name.setColumnSpecs(Collections.singletonList("COMMENT '名字'"));// ageColDataType anInt = new ColDataType("INT");ColumnDefinition age = new ColumnDefinition("age", anInt);age.setColumnSpecs(Collections.singletonList("COMMENT '仙人年龄'"));// 设置字段List<ColumnDefinition> columnDefinitionList = new ArrayList<>();columnDefinitionList.add(id);columnDefinitionList.add(name);columnDefinitionList.add(age);createTable.setColumnDefinitions(columnDefinitionList);// 设置IF NOT EXISTScreateTable.setIfNotExists(true);// 设置引擎、字符集、排序规则createTable.setTableOptionsStrings(Arrays.asList("ENGINE = InnoDB", "CHARACTER SET = utf8mb4", "COLLATE = utf8mb4_general_ci"));// 打印建表语句System.out.println(createTable);}
}
结果：
CREATE TABLE IF NOT EXISTS t_one (id BIGINT (20) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT COMMENT '主键', name VARCHAR (64) COMMENT '名字', age INT COMMENT '仙人年龄') ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci