/**
* 通过注解拼接建表语句
* create table test_person(
* pid number(10) primary key,
* person_name varchar2(255)
* );
* 思路：
*
*
*/
@Table(name="test_person")
public class Person {
@Id
private Integer pid;
@Column(name="person_name")
private String pname;
public Integer getPid() {
return pid;
}
public void setPid(Integer pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public static void main(String[] args) {
Class clazz = Person.class;
Table table = (Table)clazz.getAnnotation(Table.class);
StringBuffer sql = new StringBuffer("create table "+table.name()+" (");
Field[] fields = clazz.getDeclaredFields();
for(int i = 0;i<fields.length;i++){
String fieldName = fields[i].getName();
Column col = fields[i].getAnnotation(Column.class);
String colName = col==null?fieldName:col.name();//获取列名
sql.append(colName);
if(fields[i].getType()==Integer.class){
sql.append(" number(10) ");
}else if(fields[i].getType()==String.class){
sql.append(" varchar2(255) ");
}
Id id = fields[i].getAnnotation(Id.class);
String pkContent = id==null?",":"primary key,";
sql.append(pkContent);
}
sql.deleteCharAt(sql.length()-1);
sql.append(")");
System.out.println(sql);
}
}
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface Table {
public String name() default("");
}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD,ElementType.FIELD})
public @interface Id {
}
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD,ElementType.FIELD})
public @interface Column {
public String name() default("");
}