IDEA提供了连接数据库的功能，连接mysql数据时，通常会遇到以下两个问题
1、未安装mysql驱动，点击安装之后重启IDEA即可
2、在配置页面填入相应配置后测试连接会出现Server returns invalid timezone. Go to ‘Advanced’ tab and set ‘serverTimezone’ property manually.错误，入下图所示
根据错误提示知道解决方式为在Advanced配置中找到serverTimezone配置，设置其值为对应的时区值，这里配置的是Asia/Shanghai，如下图所示
配置结束之后再次测试数据库连接，即可连接数据库成功，入下图所示
连接成功之后就可以通过IDEA提供的脚本来生成表对应的POJO类。具体操作步骤如下 图所示，选择要生成代码的路径之后即可生成对应的POJO
由于Generate POJOs.groovy脚本是IDEA自带的，所以生成的POJO具体的格式可能不是我们所要的，那我们可以直接修改该脚本，已达到生成我们需要的格式，同时还可以添加额外的脚本文件来生成其他类，在此次项目中我还额外添加了生成dao、service、api等层的代码。
先按照下图所示的路径找到对应的脚本，打开脚本文件，查看对应的代码
IDEA默认代码如下所示，脚本使用groovy编写，会java的上手也很快。看如下代码我们可以知道默认的生成类的不足之处如下
1、写死了packageName为com.sample
2、同时表字段类型的映射可能和我们实际项目中有差异
3、类名为表名规则为去除下划线后首字母大写的驼峰式
4、各属性没有注解和注释
5、生成了getter和setter，项目中使用lombok插件，使用@Data注解即可，不需要getter和setter
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]
}根据该默认脚本修改之后的脚本如下
import com.intellij.database.model.DasTable
import com.intellij.database.util.Case
import com.intellij.database.util.DasUtil
import java.io.*
import java.text.SimpleDateFormat
import com.intellij.database.model.ObjectKind
/*
* Available context bindings:
* SELECTION Iterable<DasObject>
* PROJECT project
* FILES files helper
*/
packageName = "com.sample;"
typeMapping = [
(~/(?i)tinyint|smallint|mediumint/) : "Integer",
(~/(?i)int/) : "Integer",
(~/(?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)number/) : "Integer",
(~/(?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)
packageName = getPackageName(dir)
new File(dir, className + ".java").withPrintWriter("utf-8") { 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 com.baomidou.mybatisplus.annotation.TableField;"
out.println "import com.baomidou.mybatisplus.annotation.TableName;"
out.println "import com.wisdytech.common.bean.BaseModel;"
out.println "import lombok.Data;"
out.println "import java.io.Serializable;"
Set types = new HashSet()
fields.each() {
types.add(it.type)
}
if (types.contains("Date")) {
out.println ""
out.println "import java.util.Date;"
}
if (types.contains("InputStream")) {
out.println "import java.io.InputStream;"
}
out.println ""
out.println "@Data"
out.println "@TableName(\"" + table.getName() + "\")"
out.println "public class $className extends BaseModel implements Serializable {"
out.println ""
out.println "\tprivate static final long serialVersionUID = 1;"
fields.each() {
// 输出注释
if (isNotEmpty(it.commoent)) {
out.println "\t/**"
out.println " \t* ${it.commoent.toString()}"
out.println " \t*/"
}
if (it.annos != "") out.println " ${it.annos}"
out.println "\tprivate ${it.type} ${it.name};"
out.println ""
}
out.println ""
out.println "}"
}
def isNotEmpty(content) {
return content != null && content.toString().trim().length() > 0
}
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 : "\t@TableField(\""+col.getName()+"\")"
]
def array = ["pk_id","del_flag","create_user","create_date","update_user","update_date","remark"];
if (!((Case.LOWER.apply(col.getName())) in array)) {
fields += [comm]
}
else {
fields += []
}
}
}
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[2..-1] : Case.LOWER.apply(s[0]) + s[1..-1]
}修改点如下
1、代码获取packageName
2、使用lombok生成setter和getter
3、使用了mybatisplus，生成对应的注解
4、过滤一些公用的属性
5、修改生成的类名
6、修改表字段类型的映射