idea database 快速生成实体类注释序列化

最新推荐文章于 2023-03-24 16:33:05 发布

生生不息，折腾不止

最新推荐文章于 2023-03-24 16:33:05 发布

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分类专栏：笔记

本文链接：https://blog.youkuaiyun.com/xqqcsdn/article/details/83108516

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本文介绍了一种使用Groovy脚本自动生成Java POJO类的方法，通过解析数据库表结构，映射到Java实体类，简化了代码生成过程。

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按着下面步骤：

这个 Generate MyPOJOs.groovy 是我自定义的

在这里创建才可以用

这里创建一个文件即可。把下面代码复制进去即可

import com.intellij.database.model.DasTable
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil
import java.io.*
/*
 * Available context bindings:
 *   SELECTION   Iterable<DasObject>
 *   PROJECT     project
 *   FILES       files helper
 */

packageName = "com.xxx.busi.entity;;"
typeMapping = [
        (~/(?i)int/)                      : "Long",
        (~/(?i)float|double|decimal|real/): "Double",
        (~/(?i)datetime|timestamp/)       : "java.util.Date",
        (~/(?i)date/)                     : "java.util.Date",
        (~/(?i)time/)                     : "java.util.Date",
        (~/(?i)/)                         : "String"
]

FILES.chooseDirectoryAndSave("Choose directory", "Choose where to store generated files") { dir ->
    SELECTION.filter { it instanceof DasTable }.each { generate(it, dir) }
}

def generate(table, dir) {
    def tableNameDispose = table.getName().substring((table.getName().indexOf("dr_") + 2), table.getName().length())
    out.println tableNameDispose
    def className = javaName(tableNameDispose, true)
    out.println className
    def fields = calcFields(table)
    PrintWriter output = new PrintWriter(new OutputStreamWriter(new FileOutputStream( new File(dir, className + ".java")), "utf-8"))
    output.withPrintWriter { out -> generate(out, className, fields,table.getName()) }
}

def generate(out, className, fields,tableName) {
    out.println "package $packageName"
    out.println "import java.io.Serializable;"
    out.println "import javax.persistence.Entity;"
    out.println "import javax.persistence.Table;"
    out.println ""
    out.println "@Entity"
    out.println "@Table(name = \"${tableName}\")"
    out.println "public class $className implements Serializable{"
    out.println ""
    def msum= (long)(Math.random()*1000000000000000000+1000000000000000000)
    out.println  "  private static final long serialVersionUID = ${msum}L;"
    fields.each() {
        if (isNotEmpty(it.commoent)) {
            out.println ""

            out.println "\t/**"
            out.println "\t * ${it.commoent}"
            out.println "\t */"
        }
        if (it.annos != "") out.println "  ${it.annos}"
        out.println "  private ${it.type} ${it.name};"
    }
    out.println ""
    fields.each() {
        out.println ""
        out.println "  public ${it.type} get${it.name.capitalize()}() {"
        out.println "    return ${it.name};"
        out.println "  }"
        out.println ""
        out.println "  public void set${it.name.capitalize()}(${it.type} ${it.name}) {"
        out.println "    this.${it.name} = ${it.name};"
        out.println "  }"
        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
        fields += [[
                           name : javaName(col.getName(), false),
                           type : typeStr,
                           commoent: col.getComment(),
                           annos: ""]]
    }
}

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
}

当然这些代码一般都会大概看的懂，可以改成只能想要的那种格式