IDEA通过数据库表生成带注解的实体类（自定义）
idea真是个好东西，可以连接数据库然后通过数据库的表自动生成实体类，可以使用idea自带的，也可以按自己的想法去生成实体类。下面我们一起来操作一遍（以2020.08版本）
第一步，我们先用idea连接数据库
如果连接失败，可以试着在URL后面加上 ?serverTimezone=GMT
第二步，定义好生成规则
然后把以下代码复到新建的 MyGenerate POJOs.groovy 文件中
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
/*
* Available context bindings:
* SELECTION Iterable
* PROJECT project
* FILES files helper
*/
packageName = ""
typeMapping = [
(~/(?i)tinyint|smallint|mediumint/) : "Integer",
(~/(?i)int/) : "Long",
(~/(?i)bool|bit/) : "Boolean",
(~/(?i)float|double|decimal|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 lombok.Data;"
out.println "import org.hibernate.annotations.DynamicUpdate;"
out.println "import org.hibernate.annotations.GenericGenerator;"
out.println "import org.hibernate.annotations.UpdateTimestamp;"
out.println "import javax.persistence.*;"
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 xhy\n" +
" * @Date "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + " \n" +
" */"
out.println ""
out.println "@Entity"
out.println "@DynamicUpdate"
out.println "@Data"
out.println "@ToString"
out.println "@Table ( name =\""+table.getName() +"\" )"
out.println "public class $className implements Serializable {"
out.println ""
fields.each() {
out.println ""
// 输出注释
if (isNotEmpty(it.commoent)) {
out.println "\t/** ${it.commoent.toString()} */"
}
if (it.annos != "") out.println " ${it.annos.replace("[@Id]", "")}"
// 输出成员变量
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
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 += "\t@Id\n" +
"\t@GenericGenerator(name=\"systemUUID\",strategy=\"uuid\")\n" +
"\t@GeneratedValue(generator=\"systemUUID\")"
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('')
}
}
第三步，按下图步骤生成实体类
效果如下：
注意：我的配置文件中直接写了lombok支持的注解，如果@Data报错，需要在idea的plugin插件中安装lombok插件。