使用idea根据数据库表来生成对应的实体类

女爷i 2024-04-18 17:28 75阅读 0赞

1.  打开idea，找到database，选择想要连接的数据库类型

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1.  输入数据库连接信息，点击test connection ，出现Successful, 然后点击Apply, OK  
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    3, idea右边会出现数据库的表，  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70 2]  
    4，选中一张表右键，进入生成实体类的脚步目录  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70 3]  
    5，进入到这里，idea左边的目录，点击进入groovy脚本文件，修改成你想要的生成格式  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70 4]  
    6，下面代码就是我的groovy脚本的内容，可以拷贝粘贴

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
    
    
    packageName = ""
    typeMapping = [
            (~/(?i)tinyint|smallint|mediumint/)      : "Integer",
            (~/(?i)int/)                             : "Long",
            (~/(?i)decimal/)                         : "BigDecimal",
            (~/(?i)bool|bit/)                        : "Boolean",
            (~/(?i)float|double|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) }
    }
    
    // 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 java.io.Serializable;"
      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  guoyingjie\n" +
              " * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
              " */"
      out.println ""
      out.println "@Table(name =\""+table.getName() +"\")"
      out.println "public class $className  implements Serializable {"
      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("[seqName]", table.getName())}"
    
        // 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() }.value
        def comm =[
                colName : col.getName(),
                name :  javaName(col.getName(), false),
                type : typeStr,
                commoent: col.getComment(),
                annos: ""
        ]
        if("id".equals(Case.LOWER.apply(col.getName())))
          comm.annos += "@Fields(isPrimaryKey=true,sequenceName=\"seq_[seqName]_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 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;"
    }

7，再次选择表，然后生成pojo类，**点击scripted Extensions下面的第一个选项，注意是第一个选项**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70 5]  
8,点击之后会弹出一个弹框用来选择文件所要存放的目录，**建议选择项目的pojo类的目录**，选完open即可，然后去你的pojo目录下就能找到你想要生成的表对应的实体类。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70 6]

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