IDEA中根据数据库自动生成实体类，并自定义所生成的实体类中的注解 @Table @Id @...

使用IDEA项目添加Hibernate扩展，生成实体类并配置实体类中的注解

一、使用Hibernate自动生成实体类

1.在项目上右键，选择Add Framework Support找到 Hibernate勾选 OK

2.Ctrl+Alt+Shift+S 快捷键呼出Project Structure窗口，展开项目，选择Hibernate 点击图示的“+”号为Hibernate添加xml文件配置。

3.在左侧会出现一个Persistence 点击后右键图示的Hibernate项选择最后一个

4.选择数据库地址（此处需要提前在右侧的Datebase处连接数据库配置）、选择生成的实体类位置、选择要生成实体类的表，OK

这样，表就生成了。但是生成的实体类中的注解可能不如我们所愿，比如@Id注解、@Table注解的缺失，这个怎么配置呢？👇

二、配置自动生成实体类的注解信息

1.如图，选择数据库连接，右键 选择Scripted Extensions选择第一个，他会让你选择路径，选择生成路径即可，这里要注意，这个选择之后在你选择的包下不会生成任何东西！

2.选择刚才同一个地方的最后一个，展开配置文件目录

3.新建一个MyGenerate POJOs.groovy，将下面的代码复制进去

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.io.*
import java.text.SimpleDateFormat/** Available context bindings:*   SELECTION   Iterable<DasObject>*   PROJECT     project*   FILES       files helper*/
packageName = ""
typeMapping = [(~/(?i)tinyint|smallint|mediumint/)      : "Integer",(~/(?i)int/)                             : "Long",(~/(?i)bool|bit/)                        : "Boolean",(~/(?i)float|double|decimal|real/)       : "Double",(~/(?i)datetime|timestamp|date|time/)    : "Date",(~/(?i)blob|binary|bfile|clob|raw|image/): "InputStream",(~/(?i)/)                                : "String"
]FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->SELECTION.filter { it instanceof DasTable && it.getKind() == ObjectKind.TABLE }.each { generate(it, dir) }
}def generate(table, dir) {def className = javaClassName(table.getName(), true)def fields = calcFields(table)packageName = getPackageName(dir)PrintWriter printWriter = new PrintWriter(new OutputStreamWriter(new FileOutputStream(new File(dir, className + ".java")), "UTF-8"))printWriter.withPrintWriter {out -> generate(out, className, fields,table)}//    new File(dir, className + ".java").withPrintWriter { out -> generate(out, className, fields,table) }
}// 获取包所在文件夹路径
def getPackageName(dir) {return dir.toString().replaceAll("\\\\", ".").replaceAll("/", ".").replaceAll("^.*src(\\.main\\.java\\.)?", "") + ";"
}def generate(out, className, fields,table) {out.println "package $packageName"out.println ""out.println "import javax.persistence.*;"//out.println "import javax.persistence.Column;"//out.println "import javax.persistence.Entity;"//out.println "import javax.persistence.Table;"//out.println "import java.io.Serializable;"//out.println "import lombok.Getter;"//out.println "import lombok.Setter;"//out.println "import lombok.ToString;"Set types = new HashSet()fields.each() {types.add(it.type)}if (types.contains("Date")) {out.println "import java.util.Date;"}if (types.contains("InputStream")) {out.println "import java.io.InputStream;"}out.println ""out.println "/**\n" +" * @Description  \n" +" * @Author  lqk\n" +" * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +" */"out.println ""//out.println "@Setter"//out.println "@Getter"//out.println "@ToString"out.println "@Entity"out.println "@Table ( name =\""+table.getName() +"\" )"out.println "public class $className  {"//out.println ""//out.println genSerialID()fields.each() {out.println ""// 输出注释if (isNotEmpty(it.commoent)) {out.println "\t/**"out.println "\t * ${it.commoent.toString()}"out.println "\t */"}if (it.annos != "") out.println "   ${it.annos.replace("[@Id]", "")}"// 输出成员变量out.println "\tprivate ${it.type} ${it.name};"}// 输出get/set方法
//    fields.each() {
//        out.println ""
//        out.println "\tpublic ${it.type} get${it.name.capitalize()}() {"
//        out.println "\t\treturn this.${it.name};"
//        out.println "\t}"
//        out.println ""
//
//        out.println "\tpublic void set${it.name.capitalize()}(${it.type} ${it.name}) {"
//        out.println "\t\tthis.${it.name} = ${it.name};"
//        out.println "\t}"
//    }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() }.valuedef comm =[colName : col.getName(),name :  javaName(col.getName(), false),type : typeStr,commoent: col.getComment(),annos: "\t@Column(name = \""+col.getName()+"\" )"]if("id".equals(Case.LOWER.apply(col.getName())))comm.annos +=["@Id"]fields += [comm]}
}// 处理类名（这里是因为我的表都是以t_命名的，所以需要处理去掉生成类名时的开头的T，
// 如果你不需要那么请查找用到了 javaClassName这个方法的地方修改为 javaName 即可）
def javaClassName(str, capitalize) {def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str).collect { Case.LOWER.apply(it).capitalize() }.join("").replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")// 去除开头的T  http://developer.51cto.com/art/200906/129168.htm//s = s[1..s.size() - 1]capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]
}def javaName(str, capitalize) {
//    def s = str.split(/(?<=[^\p{IsLetter}])/).collect { Case.LOWER.apply(it).capitalize() }
//            .join("").replaceAll(/[^\p{javaJavaIdentifierPart}]/, "_")
//    capitalize || s.length() == 1? s : Case.LOWER.apply(s[0]) + s[1..-1]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 strif(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('')}
}static String genSerialID()
{return "\tprivate static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
}

4.再次进行第一步操作，生成实体类，实体类中就有了@Table、@Id等更详尽的注解