IDEA根據數據庫表生成pojo對象

1.連接數據庫

　　

 

 

 

 

 

 

 

 

 

 

2.編寫groovy文件

　　連接成功之后，會在右側看見數據庫的表，如下圖所示

　　

 

 

 

 　　右鍵點擊表，可以看到generate POJOs.groovy

　　

　　但用這種方法生成的pojo對象是沒有注釋的，而且也缺少一些的注解，所以需要用我們自己編寫的groovy文件，點擊Generate POJOs.groovy下的Go To Scripts Directory

　　在schema下創建Generate MyPOJOs.groovy，代碼如下

 

 

　　

 

 　　

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 = 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)} // new File(dir, className + ".java").withPrintWriter { out -> generate(out, className, fields,table) }
} // 獲取包所在文件夾路徑
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.Column;" out.println "import javax.persistence.Entity;" out.println "import javax.persistence.Table;" out.println "import java.io.Serializable;" out.println "import javax.persistence.Id;" 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  Hunter\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  implements Serializable {" out.println "" out.println genSerialID() fields.each() { out.println ""
        // 輸出注釋
        if (isNotEmpty(it.commoent)) { out.println "\t/**" out.println "\t * ${it.commoent.toString()}" out.println "\t */" } if ((it.annos+"").indexOf("[@Id]") >= 0) out.println "\t@Id"

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

        // 輸出成員變量
        out.println "\tprivate ${it.type} ${it.name};" } // 輸出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() }.value def 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] } } // 處理類名（這里是因為我的表都是以t_命名的，所以需要處理去掉生成類名時的開頭的T， // 如果你不需要那么請查找用到了 javaClassName這個方法的地方修改為 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}[_]]/, "_") // 去除開頭的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 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;" }

 

 

3.生成對象

　　使用我們自己的groovy來生成POJO對象