依赖

        <dependency><groupId>com.github.jsqlparser</groupId><artifactId>jsqlparser</artifactId><version>4.3</version></dependency>

删除表

import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.drop.Drop;public class DropTableDemo {public static void main(String[] args) {Drop drop = new Drop();drop.setIfExists(true);drop.setType("TABLE");Table table = new Table("t_one");drop.setName(table);System.out.println(drop);}
}

语句：

DROP TABLE IF EXISTS t_one

修改字段定义

import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.alter.Alter;
import net.sf.jsqlparser.statement.alter.AlterExpression;
import net.sf.jsqlparser.statement.alter.AlterOperation;
import net.sf.jsqlparser.statement.create.table.ColDataType;import java.util.Collections;public class AlterTableDemo {public static void main(String[] args)throws Exception {Alter alter = new Alter();alter.setTable(new Table("t_one"));// 修改姓名ColDataType varchar = new ColDataType("VARCHAR");varchar.setArgumentsStringList(Collections.singletonList("128"));AlterExpression.ColumnDataType name = new AlterExpression.ColumnDataType("name", false, varchar, Collections.singletonList("COMMENT '道号'"));AlterExpression alterExpression = new AlterExpression();alterExpression.setOperation(AlterOperation.MODIFY);alterExpression.addColDataType(name);alter.addAlterExpression(alterExpression);// 修改仙龄ColDataType anInt = new ColDataType("INT");anInt.setArgumentsStringList(Collections.singletonList("10"));AlterExpression.ColumnDataType age = new AlterExpression.ColumnDataType("age", false, anInt, Collections.singletonList("COMMENT '仙龄'"));AlterExpression ageAlterexpression = new AlterExpression();ageAlterexpression.setOperation(AlterOperation.MODIFY);ageAlterexpression.addColDataType(age);alter.addAlterExpression(ageAlterexpression);System.out.println(alter);}
}

语句：

ALTER TABLE t_one MODIFY name VARCHAR (128) COMMENT '道号', MODIFY age INT (10) COMMENT '仙龄'

新增字段

import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.alter.Alter;
import net.sf.jsqlparser.statement.alter.AlterExpression;
import net.sf.jsqlparser.statement.alter.AlterOperation;
import net.sf.jsqlparser.statement.create.table.ColDataType;import java.util.Collections;public class AddColumnDemo {public static void main(String[] args) {Alter alter = new Alter();alter.setTable(new Table("t_one"));AlterExpression alterExpression = new AlterExpression();alterExpression.setOperation(AlterOperation.ADD);ColDataType bigint = new ColDataType("BIGINT");bigint.setArgumentsStringList(Collections.singletonList("20"));AlterExpression.ColumnDataType fightingCapacity = new AlterExpression.ColumnDataType("fighting_capacity", false, bigint, Collections.singletonList("COMMENT '战力'"));alterExpression.addColDataType(fightingCapacity);alter.addAlterExpression(alterExpression);System.out.println(alter);}
}

语句：

ALTER TABLE t_one ADD fighting_capacity BIGINT (20) COMMENT '战力'

删除字段

import net.sf.jsqlparser.schema.Table;
import net.sf.jsqlparser.statement.alter.Alter;
import net.sf.jsqlparser.statement.alter.AlterExpression;
import net.sf.jsqlparser.statement.alter.AlterOperation;public class DropColumnDemo {public static void main(String[] args)throws Exception {Alter alter = new Alter();alter.setTable(new Table("t_one"));AlterExpression alterExpression = new AlterExpression();alterExpression.setOperation(AlterOperation.DROP);alterExpression.setColumnName("fighting_capacity");alter.addAlterExpression(alterExpression);System.out.println(alter);}
}

语句：

ALTER TABLE t_one DROP fighting_capacity