idea自动根据表生成实体类

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|boolean|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) {
    //想创建的类名 ：表名去掉"_" + Bean (teststudentBean)
    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)}

}

// 获取包所在文件夹路径
def getPackageName(dir) {
    return dir.toString().replaceAll("\\\\", ".").replaceAll("/", ".").replaceAll("^.*src(\\.main\\.java\\.)?", "") + ";"
}
//添加需要的包（或自动导包）
def generate(out, className, fields,table) {
    out.println "package $packageName"
    out.println ""
    out.println "import jakarta.persistence.Column;"
    out.println "import jakarta.persistence.Table;"
    out.println "import java.io.Serializable;"
    out.println "import lombok.*;"
    out.println "import org.springframework.format.annotation.DateTimeFormat;"
    out.println "import com.fasterxml.jackson.annotation.JsonFormat;"
    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 ""
    //添加生成类的注释内容：常用@author作者及@date时间等，根据需要添加对应的类注释
    out.println "/**\n" +
            " * @author  作者\n" +
            " * @date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
            " */"
    out.println ""
    //这里使用lombok，添加相应注解
    out.println "@Data"
    out.println "@NoArgsConstructor"
    out.println "@AllArgsConstructor"
    out.println "@Entity"
    //对应数据库表名
    out.println "@Table(name=\""+table.getName() +"\")"
    //Serializable
    out.println "public class $className  implements Serializable {"
    out.println ""
    out.println genSerialID()



    fields.each() {

        out.println ""

        if (isNotEmpty(it.name)) {
            out.println "\t/**"
            out.println "\t * ${it.name.toString()} ${it.commoent.toString()}"
            out.println "\t */"
        }
        if (it.annos != "") out.println "   ${it.annos}"
        //id
        if ((className + "_id").equalsIgnoreCase(it.colName) || "id".equalsIgnoreCase(it.colName)) {
            out.println "\t@TableId(value = \"id\", type = IdType.AUTO)"
        }
        //date日期格式字段添加@JsonFormat和@DateTimeFormat注解
        if ("Date".equalsIgnoreCase(it.type)) {
            out.println '''\t@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")'''
            out.println '''\t@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")'''
        }
        out.println "\t@Column(name=\""+it.colName+"\")"
        // Oracle类型处理逻辑
        def fieldType = it.type
        def columnType = it.columnType?.toString()?.toUpperCase() ?: ""

        // 处理Oracle NUMBER类型
        if (columnType.startsWith("NUMBER")) {
            // 获取精度和小数位（Oracle格式如 NUMBER(10) 或 NUMBER(10,2)）
            def precision = 0
            def scale = 0
            def matcher = columnType =~ /NUMBER$(\d+)(?:,(\d+))?$/
            if (matcher.find()) {
                precision = matcher.group(1)?.toInteger() ?: 0
                scale = matcher.group(2)?.toInteger() ?: 0
            }

            // 根据精度决定映射类型
            if (scale > 0) {
                fieldType = "BigDecimal"  // 有小数位
            } else if (precision <= 9) {
                fieldType = "Integer"     // 小整数
            } else if (precision <= 18) {
                fieldType = "Long"        // 大整数
            } else {
                fieldType = "BigDecimal"  // 超大数字
            }
        }

        out.println "\tprivate ${fieldType} ${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: ""]
        fields += [comm]
    }
}

// 根据需要处理类名（这里示例类名为teststudentBean）这里去掉_
def javaClassName(str, capitalize) {
    def s = com.intellij.psi.codeStyle.NameUtil.splitNameIntoWords(str)
            .collect { Case.LOWER.apply(it).capitalize() }
            .join("")
            .replaceAll(/[^\p{javaJavaIdentifierPart}[_]]/, "_")
}

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;"
}