idea怎么根据数据库表自动生成JPA实体类

本篇内容主要讲解"idea怎么根据数据库表自动生成JPA实体类"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"idea怎么根据数据库表自动生成JPA实体类"吧!

在一些软件开发过程模式下，可能会需要根据数据库表生成对应的实体。在idea工具中如何做到这点呢？最简单的答案可能是使用插件吧。其实还有一个很快捷的方法，步骤如下：

1. 通过view->tool windows->database菜单，打开数据库工具

2. 连接数据库

3. 选定需要生成实体类的表，右键菜单选择scripted extensions，有一个Generate POJOs.groovy

如此生成的实体类也许不能满足你的需求，你可以自己写一个groovy脚本来生成符合需求的实体类。在上面的第三步中，下面有一个go to scripts directory菜单，即可打开脚本目录。在此目录下新建一个脚本，比如Generate jpa Entity Object.groovy。

比如我创建的脚本如下

import com.intellij.database.model.DasTableimport com.intellij.database.util.Caseimport com.intellij.database.util.DasUtil/* * Available context bindings: *   SELECTION   Iterable *   PROJECT     project *   FILES       files helper */packageName = "me.test.entity;"typeMapping = [        (~/(?i)bigint/)                   : "Long",        (~/(?i)tinyint/)                  : "Boolean",        (~/(?i)int/)                      : "Integer",        (~/(?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)  new File(dir, className + ".java").withPrintWriter { out -> generate(out, className, fields, table) }}def generate(out, className, fields, table) {  out.println "package $packageName"  out.println ""  out.println "import lombok.Data;"  out.println "import javax.persistence.*;"  out.println ""  out.println "/**"  out.println " * entity class for ${table.getName()}"  if (isNotEmpty(table.getComment())) {    out.println " * ${table.getComment()}"  }  out.println "*/"  out.println "@Data"  out.println "@Entity"  out.println "@Table(name = \"${table.getName()}\")"  out.println "public class $className {"  out.println ""  fields.each() {    out.println "\t/**"    out.println "\t* ${isNotEmpty(it.comment) ? it.comment : it.name}"    out.println "\t*/"    if (it.annos.size() > 0)      it.annos.each() {        out.println "\t${it}"      }    out.println "\tprivate ${it.type} ${it.name};"  }  out.println ""  out.println "}"}def calcFields(table) {  DasUtil.getColumns(table).reduce([]) { fields, col ->    def spec = Case.LOWER.apply(col.getDataType().getSpecification())    def typeStr = typeMapping.find { p, t -> p.matcher(spec).find() }.value    def anos = [];    if (Case.LOWER.apply(col.getName()).equals('id')) {      anos += ["@Id", "@GeneratedValue(strategy = GenerationType.IDENTITY)"]    } else {      anos += ["@Column(name = \"${col.getName()}\")"]    }    def field = [            name : javaName(col.getName(), false),            type : typeStr,            comment: col.getComment(),            annos: anos]    fields += [field]  }}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}static String changeStyle(String str, boolean toCamel){  if(!str || str.size() <= 1)    return str  if(toCamel){    String r = str.toLowerCase().split('_').collect{cc -> Case.LOWER.apply(cc).capitalize()}.join('')    return r[0].toLowerCase() + r[1..-1]  }else{    str = str[0].toLowerCase() + str[1..-1]    return str.collect{cc -> ((char)cc).isUpperCase() ? '_' + cc.toLowerCase() : cc}.join('')  }}

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