IDEA下生成SpringDataJPA的Java实体

IDEA下生成SpringDataJPA的Java实体


最近在研究SpringDataJPA,首先的第一步当然是需要知道怎么快速的生成对应的Java实体,Google上看到的大部分都是使用Eclipse进行生成,下面记录下IDEA的生成方式,比较简单。


IDEA操作流程

idea-jpa-generate.png

  1. Idea中选择Database,如果没有则需要自己新增一个。
  2. 连接需要生成的数据库。
  3. 写入生成的脚本信息。
  4. 直接生成。

可以按照自己的需求来对下面的脚本配置信息进行修改。


配置信息

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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
*/
//修改为你的实体类的包名
packageName = "com.yanzhenyidai.squid.miniprogram.entity;"
typeMapping = [
(~/(?i)int/) : "Long",
(~/(?i)float|double|decimal|real/): "Double",
(~/(?i)bool|boolean/) : "Boolean",
(~/(?i)datetime|timestamp/) : "java.util.Date",
(~/(?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 $packageName"
out.println ""
out.println "import lombok.Data;"
out.println ""
out.println "import javax.persistence.*;"
out.println "import java.io.Serializable;"
out.println ""
out.println "@Data"
out.println "@Entity"
out.println "@Table(name = \"$tableName\")"
out.println "public class $className implements Serializable {"
out.println ""
// 判断自增
if ((tableName + "_id").equalsIgnoreCase(fields[0].colum) || "id".equalsIgnoreCase(fields[0].colum)) {
out.println "\[email protected]"
out.println "\[email protected](strategy=GenerationType.IDENTITY)"
}
fields.each() {
if (it.annos != "") out.println " ${it.annos}"
if (it.colum != it.name) {
out.println "\[email protected](name = \"${it.colum}\")"
}
out.println "\tprivate ${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),
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}]/, "_").replaceAll(/_/, "")
capitalize || s.length() == 1 ? s : Case.LOWER.apply(s[0]) + s[1..-1]
}