java如何根据实体类图生成sql脚本？

Posted 2023-04-01

就是数据库建模工具中的导出sql脚本这个功能是怎么实现的

自动生成C#和Java实体类，自动生连接符为“&”和“+”的INSERT,UPDATE,DELETE,SELECT语句，支持简单的数据查询修改。 参考技术A 你说的是?mybatis generator?

如何利用SQL中数据使用FreeMarker生成JAVA实体bean代码

参考技术A 利用freemarker生成JAVA BEAN

Freemarker模板代码如下：

package $packageName;

/**
* <#if author == "adams"> @author adams </#if>
*/
pulic class $className
<#list attrs as a>
private $a.type $a.field;
</#list>

<#list attrs as a>
public void set$a.field?cap_first($a.type $a.field)
this.$a.field = $a.field;


public $a.type get$a.field?cap_first()
return this.$a.field;


</#list>


Java代码如下

package com.my.learn.freemarker;
public class Attr
public String field;
public String type;

public Attr(String field, String type)
this.field = field;
this.type = type;


public String getField()
return this.field;


public String getType()
return this.type;


public void setField(String field)
this.field = field;


public void setType(String type)
this.type = type;



package com.my.learn.freemarker;
import java.io.File; import java.io.IOException; import java.io.StringWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;
import freemarker.template.Configuration; import freemarker.template.Template; import freemarker.template.TemplateException;
public class FmAppUseage

public static void main(String[] args)
List<Object> list = new ArrayList<Object>();
list.add(new Attr("username", "String"));
list.add(new Attr("password", "String"));
list.add(new Attr("age", "int"));
list.add(new Attr("hobby", "String"));

Map<String,Object> root = new HashMap<String, Object>();
root.put("packageName", "com.my.learn.freemarker");
root.put("className", "User");
root.put("attrs", list);
root.put("author", "adams");

Configuration cfg = new Configuration();
String path = FmAppUseage.class.getResource("/").getPath()+"template";
try
cfg.setDirectoryForTemplateLoading(new File(path));
Template template = cfg.getTemplate("/demo.ftl");
StringWriter out = new StringWriter();
template.process(root, out);

System.out.println(out.toString());
catch (IOException e)
System.out.println("Cause==>" + e.getCause());
catch (TemplateException e)
System.out.println("Cause==>" + e.getCause());




输出结果如下：

package com.my.learn.freemarker;
/**
* @author adams
*/
pulic class User
private String username;
private String password;
private int age;
private String hobby;

public void setUsername(String username)
this.username = username;


public String getUsername()
return this.username;


public void setPassword(String password)
this.password = password;


public String getPassword()
return this.password;


public void setAge(int age)
this.age = age;


public int getAge()
return this.age;


public void setHobby(String hobby)
this.hobby = hobby;


public String getHobby()
return this.hobby;




当在笔者刚做测试时，将Attr的类定义在了FmAppUseage类的内部，导致不能正常运行，只能将其移除单独成一个类时，便能正常运行了。 转载仅供参考，版权属于原作者。祝你愉快，满意请采纳哦本回答被提问者和网友采纳