IDEA自定义POJO生成脚本

IDEA有个很实用的功能就是连接数据库之后能通过内置的groovy脚本自动生成POJO类

如图：

虽然很方便，不过还是有一些不足之处，如下图：

• 包名是写死的，这个是最让人不爽的一点

• 如果项目中用了lombok，那下面的那一堆getter，setter就显得很多余了，一个@Data注解就能搞定的事

• 一些数据类型映射的问题，这是IDEA默认的数据库字段与Java类型的映射关系

  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"
  ]

  不过我更喜欢下面的这种：

  typeMapping = [
          (~/(?i)int/)                      : "Integer",
          (~/(?i)float|double|decimal|real/): "Double",
          (~/(?i)datetime|timestamp/)       : "java.utils.Date",
          (~/(?i)date/)                     : "java.utils.Date",
          (~/(?i)time/)                     : "java.sql.Time",
          (~/(?i)/)                         : "String"
  ]

  看个人习惯吧

  这是我根据自己的喜好修改的

主要修改了一下几点：

• 支持生成包名(目录必须是maven项目的结构)
• 将默认生成的getter，setter代码以 @Data lombok注解代替
• 按个人习惯修改数据库字段与Java类型的映射关系

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

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

typeMapping = [
        (~/(?i)int/)                      : "Integer",
        (~/(?i)float|double|decimal|real/): "Double",
        (~/(?i)datetime|timestamp/)       : "java.util.Date",
        (~/(?i)date/)                     : "java.util.Date",
        (~/(?i)time/)                     : "java.sql.Time",
        (~/(?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 className = javaName(table.getName(), true)
    def fields = calcFields(table)
    new File(dir, className + ".java").withPrintWriter { out -> generate(dir,out, className, fields) }
}

def generate(dir,out, className, fields) {
    out.println "package " + dir.getAbsolutePath().split("main.java.")[1].replace("\\", ".").replaceAll("/", ".") + ";"
    out.println ""
    out.println "import lombok.Data;"
    out.println "import lombok.EqualsAndHashCode;"
    out.println "import lombok.ToString;"
    out.println ""
    out.println "@Data"
    out.println "@ToString"
    out.println "@EqualsAndHashCode"
    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 ""
    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,
                           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]
}

修改方法：

在Project视图下的 Scratches and Consoles -> extensions -> Database Tools and SQL -> schema 目录下，直接修改默认的 Generate POJOs.groovy 文件，或者新建一个 groovy 文件，将代码粘贴进去即可

该目录在磁盘中的路径如下：

效果：

还有一点IDEA 做的比较细节的就是，可以通过Ctrl或者Shift选中多个表，然后就能同时生成多个POJO

这是IDEA自带的生成POJO的groovy脚本

import com.intellij.database.model.DasTable
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.sample;"
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 }.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, className, fields) }
}

def generate(out, className, fields) {
  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),
                 type : typeStr,
                 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]
}