idea不需安装插件，自动生成mybatis-plus对应的实体类entity，带注解@TableName、@TableId、@TableField

目录

[1、修改Generate poJOs.groovy文件](#1、修改Generate poJOs.groovy文件)

2、idea中连接数据库

3、生成entity代码

4、查看生成的实体类

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1、修改Generate poJOs.groovy文件

在项目下方点击Scratches and Consoles→ Extensions→ Database Tools and SQL箭头→schema→ Generate POJOs.groovy

替换为以下文件，直接可用

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

//自定义包名
packageName = ""
typeMapping = [
        //类型映射
        (~/(?i)tinyint|smallint|mediumint/)      : "Integer",
        (~/(?i)int/)                             : "Long",
        (~/(?i)bool|bit/)                        : "Boolean",
        (~/(?i)float|double|decimal|real/)       : "BigDecimal",
        (~/(?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 = javaName(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)}
}

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 com.baomidou.mybatisplus.annotation.IdType;"
    out.println "import com.baomidou.mybatisplus.annotation.TableField;"
    out.println "import com.baomidou.mybatisplus.annotation.TableId;"
    out.println "import com.baomidou.mybatisplus.annotation.TableName;"
    out.println("import lombok.EqualsAndHashCode;")
    out.println "import lombok.experimental.Accessors;"
    out.println "import java.io.Serializable;"
    out.println "import lombok.Data;"

    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 ""
    out.println "@EqualsAndHashCode(callSuper = false)"
    out.println "@Accessors(chain = true)"
    out.println "@TableName ( \""+table.getName() +"\" )"
    out.println "@Data"
    out.println "public class $className  implements Serializable {"
    out.println ""
    out.println genSerialID()
    fields.each() {
        out.println ""

        //添加字段注释
        if (isNotEmpty(it.commoent)) {
            out.println "\t/**"
            out.println "\t * ${it.commoent.toString()}"
            out.println "\t */"
        }

        if (it.annos != "") out.println "   ${it.annos.replace("[@TableId]", "")}"

        //显示变量
        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 comm =[
                colName : col.getName(),
                name :  javaName(col.getName(), false),
                type : typeStr,
                commoent: col.getComment(),
                annos: "\t@TableField(value = \""+col.getName()+"\")"]
        if("id".equals(col.getName()))
            comm.annos = comm.annos.toString().replace("@TableField(value = \"id\")","@TableId(value = \"id\", type = IdType.AUTO)")
        fields += [comm]
    }
}

def javaClassName(str, capitalize) {
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
    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 = 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('')
    }
}

static String genSerialID()
{
    return "\tprivate static final long serialVersionUID =  "+Math.abs(new Random().nextLong())+"L;"
}

2、idea中连接数据库

找到idea的database，添加一个data source，我这里选择的是mysql

配置数据源地址、端口、用户密码、数据库名，点击测试连接，成功后点击ok，即可看见数据库表信息

3、生成entity代码

1）、选中要生成entity的数据库表，右键tools→Scripted Extensions→Generate poJOs.groovy

2）、选择生成的entity对应的目录

3）、右下角会有提示，已经生成

4、查看生成的实体类