后台项目开发.md · 20级软件7班/webapi

**数据库设计**

varchar 不定长，有最大值，但是存储字节小于，最大值，以实际存储的字节长度为准

时间设计，可以使用datetime，也可以使用时间戳（秒）来表示

**后端项目稍微优化**

```
实体类的自动生成代码，记得把packageName 改成自己的包名

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.time.LocalDateTime
import java.time.format.DateTimeFormatter
/*
 * Available context bindings:
 *   SELECTION   Iterable<DasObject>
 *   PROJECT     project
 *   FILES       files helper
 *   update by yitianRen 20200324
 */
packageName = "com.example.studywebapi.entity;"
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 }.each { generate(it, dir) }
}
def generate(table, dir) {
    def className = javaName(table.getName(), true)
    def fields = calcFields(table)//更改实体生成规则
    new File(dir, className + ".java").withPrintWriter("utf-8") { out -> generate(out, className, fields,table) }
    //new File(dir, className + ".java").withPrintWriter { out -> generate(out, className, fields, table) }//输出实体类
}
def generate(out, className, fields, table) {
    out.println "package $packageName"
    out.println ""
    out.println "/**\n" +
            " *  \n" +
            " * <p>@Date: " + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yy-MM-dd HH:mm:ss")).toString() + ".</p>\n" +
            " *\n" +
            " * @author linqh03\n" +
            " */"
    out.println ""
    out.println "import lombok.Data;"
    out.println " import javax.persistence.Entity;"
    out.println "import javax.persistence.*;"
    out.println "import java.io.Serializable;"
    out.println "import io.swagger.annotations.ApiModel;"
    out.println "import io.swagger.annotations.ApiModelProperty;"

out.println ""
    out.println "@Table ( name =\"" + table.getName() + "\" )"
    out.println "@Data"
    out.println "@Entity"
    out.println "@ApiModel"
    out.println "public class $className  implements Serializable{"
    out.println ""
    out.println "private static final long serialVersionUID = 1L;"
    fields.each() {
        out.println ""
        // 输出注释  这里和下面的 comm是一一对应的
/*    if (isNotEmpty(it.commoent)) {//定义非空校验，it.commoent ！= ""手写无效
      out.println "// ${it.commoent}"
    }*/
        if (it.name == "id") out.println "  @Id"
        if (it.annos != "") out.println "  ${it.annos}"
        if (it.name == "id") out.println "  @GeneratedValue(strategy = GenerationType.IDENTITY)"
        out.println "  @ApiModelProperty( value=\"${it.commoent}\")"
        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
        def comm = [
                name : col.getName(),
                type : typeStr,
                commoent: col.getComment(),
                annos: "@Column(name = \"" + col.getName() + "\" )"
        ]
        //对于表中主键自定义注解
        if ("pk".equals(Case.LOWER.apply(col.getName()))){
            comm.annos = "\t@Id\n"
            //自增主键需要
            comm.annos += "@Column(name = \"" + col.getName() + "\")"
        }
        fields += [comm]//字段对照
    }
}
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]
}
def isNotEmpty(content) {
    return content != null && content.toString().trim().length() > 0
}

```

项目类型：h5,app (不会存储cookie)

每个表都有一个控制器

**接口文档的地址**

http://localhost:9090/swagger-ui.html

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