1. maven依赖
springboot2、spring-data-jpa、lombok
使用spring-data-jpa
的时候,我们往往不需要生成mapper相关的文件,只需要自动生成POJO类,提高开发效率,这里总结了下自己使用IDEA实现自动生成POJO的方式
2. 步骤
2.1. 在IDEA中连接数据库
idea-01.png idea-02.png2.2. 选择数据库表
idea-03.png2.3. 修改groovy配置文件
idea-04.png参照上面的步骤对配置文件进行个性化修改:
- 注意修改包名称packageName
- 添加需要的注解
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.text.DateFormat
import java.text.SimpleDateFormat
/*
* Available context bindings:
* SELECTION Iterable<DasObject>
* PROJECT project
* FILES files helper
*/
packageName = "fastcloud.management.pojo;" //这里要换成自己项目 实体的包路径
typeMapping = [
(~/(?i)int/) : "Integer", //数据库类型和Jave类型映射关系
(~/(?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("utf-8") { out -> generate(out, table, className, fields) }
}
def generate(out, table, className, fields) {
def tableName = table.getName()
out.println "package $packageName"
out.println ""
out.println "import lombok.*;"
out.println "import org.hibernate.annotations.DynamicInsert;"
out.println "import org.hibernate.annotations.DynamicUpdate;"
out.println ""
out.println "import javax.persistence.*;"
out.println ""
out.println "/**"
out.println " * @author wcy-auto"
out.println " **/"
out.println "@NoArgsConstructor"
out.println "@AllArgsConstructor"
out.println "@Getter"
out.println "@Builder"
out.println "@ToString"
out.println "@DynamicUpdate"
out.println "@DynamicInsert"
out.println "@Entity"
out.println "@Table(name = \"$tableName\")"
out.println "public class $className extends BaseEntity {"
out.println ""
// id、createDate、updateDate这些字段我使用了一个BaseEntity,所有的pojo继承此基类,所以不需要创建数据库中的这三个字段,需要的可以自行调整
/*if ((tableName + "_id").equalsIgnoreCase(fields[0].colum) || "id".equalsIgnoreCase(fields[0].colum)) {
out.println " @Id"
out.println " @GeneratedValue(strategy=GenerationType.IDENTITY)"
}*/
fields.each() {
// 这一层if根据需要看是否要保留
if (it.name != "id" && it.name != "createTime" && it.name != "updateTime") {
if (it.comment != "" && it.comment != null) {
out.println " /**"
out.println " * ${it.comment}"
out.println " **/"
}
if (it.annos != "") out.println " ${it.annos}"
if (it.colum != it.name) {
out.println " @Column(name = \"${it.colum}\")"
}
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),
colum : col.getName(),
type : typeStr,
comment: col.getComment(),
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]
}
2.4. 生成POJO
idea-05.png之后选择要生成的目标文件夹,生成后的POJO如下:
package fastcloud.management.pojo;
import lombok.*;
import org.hibernate.annotations.DynamicInsert;
import org.hibernate.annotations.DynamicUpdate;
import javax.persistence.*;
/**
* @author wcy-auto
**/
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Builder
@ToString
@DynamicUpdate
@DynamicInsert
@Entity
@Table(name = "dept")
public class Dept extends BaseEntity {
/**
* 上级部门ID
**/
@Column(name = "parent_id")
private Integer parentId;
/**
* 部门名称
**/
private String name;
/**
* 1 - 正常,0 - 删除
**/
@Column(name = "del_flag")
private Integer delFlag;
}
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