Intellij IDEA 通过数据库表逆向生成带注释的实体类文件（Generate POJOs.groovy）（hibernate逆向工程）

大道始，损有余而补不足

由于业务增加，需要新增表，项目框架又是Hibernate，如果手写表感觉到在做无用功，而且很容易出错，这里就巴拉巴拉了前辈们的代码和博客，参考着写了个逆向生成实体类方法，生成Mybaties实体工具请参考博主分类Mybaties系列文章

逆向生成实体类的前提是你已经通过idea连接了oracle数据库，博主已经写好了一篇，仅供参考，传送门：idea连接远程Oracle数据库生成实体或者使用操作sql

 详情请仔细查看代码中的注释，我已经整理了一遍，仅供参考，如有异议请联系博主，并及时更改

import com.intellij.database.model.DasTable
import com.intellij.database.model.ObjectKind
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil

import java.time.LocalDateTime

/*
 * Available context bindings:
 *   SELECTION   Iterable
 *   PROJECT     project
 *   FILES       files helper
 *   update by yitianRen 20200324
 */

packageName = "com.sample;"
typeMapping = [
  (~/(?i)int/)                      : "long",
  (~/(?i)float|double|decimal|real/): "double",
  (~/(?i)datetime|timestamp/)       : "java.sql.Timestamp",
  (~/(?i)date/)                     : "java.sql.Date",
  (~/(?i)time/)                     : "java.sql.Time",
  (~/(?i)/)                         : "String"
]

FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->
  SELECTION.filter { it instanceof DasTable }.each { generate(it, dir) }
}

def generate(table, dir) {
  def className = javaName(table.getName(), true)
  def fields = calcFields(table)//更改实体生成规则
  new File(dir, className + ".java").withPrintWriter { out -> generate(out, className, fields, table) }//输出实体类
}

def generate(out, className, fields, table) {
  out.println "package $packageName"
  out.println ""
  out.println "/**\n" +
          " *  \n" +
          " * 
@Date: " + LocalDateTime.now().toString() + ".
\n" +
          " *\n" +
          " * @author yitianRen\n" +
          " */"
  out.println ""
  out.println "import lombok.Getter;"
  out.println "import lombok.Setter;"
  out.println "import javax.persistence.*;"
  out.println ""
  out.println "@Entity"
  out.println "@Getter"//输出注解Get
  out.println "@Setter"//输出注解Set
  out.println "@Table ( name =\"" + table.getName() + "\" )"
  out.println "public class $className {"
  out.println ""
  fields.each() {
    out.println ""
    // 输出注释  这里和下面的 comm是一一对应的
    if (isNotEmpty(it.commoent)) {//定义非空校验，it.commoent ！= ""手写无效
      out.println "\t/**"
      out.println "\t * ${it.commoent}"
      out.println "\t */"
    }
    if (it.annos != "") out.println "  ${it.annos}"
    out.println "  private ${it.type} ${it.name};"
  }
  out.println ""
  //输出get set方法
  /*fields.each() {
    out.println ""
    out.println "  public ${it.type} get${it.name.capitalize()}() {"
    out.println "    return ${it.name};"
    out.println "  }"
    out.println ""
    out.println "  public void set${it.name.capitalize()}(${it.type} ${it.name}) {"
    out.println "    this.${it.name} = ${it.name};"
    out.println "  }"
    out.println ""
  }*/
  out.println "}"
}

def calcFields(table) {
  DasUtil.getColumns(table).reduce([]) { fields, col ->
    def spec = Case.LOWER.apply(col.getDataType().getSpecification())
    def typeStr = typeMapping.find { p, t -> p.matcher(spec).find() }.value
    def comm = [
            name : javaName(col.getName(), false),
            type : typeStr,
            commoent: col.getComment(),
            annos: "@Column(name = \"" + col.getName() + "\" )"
    ]
    //对于表中主键自定义注解
    if ("pk".equals(Case.LOWER.apply(col.getName()))){
      comm.annos = "\t@Id\n"
      //自增主键需要
      comm.annos += "@Column(name = \"" + col.getName() + "\")"
    }
    fields += [comm]//字段对照
  }
}

def javaName(str, capitalize) {
  def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
    .collect { Case.LOWER.apply(it).capitalize() }
    .join("")
    .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
  capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}


def isNotEmpty(content) {
  return content != null && content.toString().trim().length() > 0
}

参考：

idea 通过 Generate POJOs.groovy 生成实体类

IDEA 自动导入数据库实体(教你自定义编写Generate POJOs)

Intellij IDEA 通过数据库表逆向生成带注释的实体类文件超级详细步骤，附详细解决方案