（SpringBoot-Jpa）使用Idea数据库自动脚本Generate POJOS生成 Entity对象，

• 因：使用SpringBoot -jpa，需要手动配置Entity

• 但是如果你的表中有很多属性，或者有很多表怎么办？？ 每个手动写？ 还是用mybatis。写mapper？？？
• 解决：使用idea自动工具
  
• 使用工具可以生成pojo对象，但是缺少了注解：
• 手动修改李groovy文件，方便以后一键生成：

import com.intellij.database.model.DasTable
import com.intellij.database.model.ObjectKind
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil

/*
 * Available context bindings:
 *   SELECTION   Iterable<DasObject>
 *   PROJECT     project
 *   FILES       files helper
 */

packageName = "com.inyu.entity;"
typeMapping = [
        (~/(?i)int/)                      : "long",
        (~/(?i)float|double|decimal|real/): "double",
        (~/(?i)datetime|timestamp/)       : "java.sql.Timestamp",
        (~/(?i)date/)                     : "java.sql.Date",
        (~/(?i)time/)                     : "java.sql.Time",
        (~/(?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)
  new File(dir, className + ".java").withPrintWriter { out -> generate(out,table, className, fields) }
}

def generate(out,table, className, fields) {
  def tableName = table.getName();
  out.println "package $packageName"
  out.println ""
  out.println ""
  out.println "public class $className {"
  out.println ""
  fields.each() {
    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),
                       colum: col.getName(),
                       type : typeStr,
                       annos: ""]]
  }
}

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]
}