jpa代码生成器 java数据库

布满荆棘的人生 2022-12-04 08:33 311阅读 0赞

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.SimpleDateFormat
    
    /*
     * Available context bindings:
     *   SELECTION   Iterable<DasObject>
     *   PROJECT     project
     *   FILES       files helper
     */
    packageName = ""
    typeMapping = [
            (~/(?i)tinyint|smallint|mediumint/)      : "Integer",
            (~/(?i)int/)                             : "Long",
            (~/(?i)bool|bit/)                        : "Boolean",
            (~/(?i)float|double|decimal|real/)       : "BigDecimal",
            (~/(?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 javax.persistence.Column;"
        out.println "import javax.persistence.Entity;"
        out.println "import javax.persistence.Table;"
        out.println "import javax.persistence.Id;"
        out.println "import javax.persistence.GeneratedValue;"
        out.println "import java.io.Serializable;"
        Set types = new HashSet()
    
        fields.each() {
            types.add(it.type)
        }
    
        if (types.contains("Date")) {
            out.println "import java.util.Date;"
        }
    
        if (types.contains("BigDecimal")) {
            out.println "import java.math.BigDecimal;"
        }
    
        if (types.contains("InputStream")) {
            out.println "import java.io.InputStream;"
        }
        out.println ""
        out.println "/**\n" +
                " * @Description  \n" +
                " * @Author  linmengmeng\n" + //1. 修改idea为自己名字
                " * @Date " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " \n" +
                " */"
        out.println ""
        out.println "@Entity"
        out.println "@Table ( name =\"" + table.getName() + "\" , schema = \"\")" //2. schema = \"后面添加自己的表空间名称(mysql可以不添加, 不用这个schema属性也行)
        out.println "public class $className  implements Serializable {"
        out.println ""
        out.println genSerialID()
        fields.each() {
            out.println ""
            // 输出注释
            if (isNotEmpty(it.commoent)) {
                out.println "\t/**"
                out.println "\t * ${it.commoent.toString()}"
                out.println "\t */"
            }
    
            if ((it.annos+"").indexOf("[@Id]") >= 0) out.println "\t@Id"
    
            if (it.annos != "") out.println "   ${it.annos.replace("[@Id]", "")}"
    
    
            // 输出成员变量
            out.println "\tprivate ${it.type} ${it.name};"
        }
    
        // 输出get/set方法
        fields.each() {
            out.println ""
            out.println "\tpublic ${it.type} get${it.name.capitalize()}() {"
            out.println "\t\treturn this.${it.name};"
            out.println "\t}"
            out.println ""
    
            out.println "\tpublic void set${it.name.capitalize()}(${it.type} ${it.name}) {"
            out.println "\t\tthis.${it.name} = ${it.name};"
            out.println "\t}"
        }
    
        // 输出toString方法
        out.println ""
        out.println "\t@Override"
        out.println "\tpublic String toString() {"
        out.println "\t\treturn \"{\" +"
        fields.each() {
            out.println "\t\t\t\t\t\"${it.name}='\" + ${it.name} + '\\'' +"
        }
        out.println "\t\t\t\t'}';"
        out.println "\t}"
    
        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   : "\t@Column(name = \"" + col.getName() + "\" )"]
            if ("id".equals(Case.LOWER.apply(col.getName())))
                comm.annos += ["@Id"]
            fields += [comm]
        }
    }
    
    // 这里是处理数据库表前缀的方法，这里处理的是t_xxx命名的表
    // 已经修改为使用javaName, 如果有需要可以在def className = javaName(table.getName(), true)中修改为javaClassName
    // 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，
    // 如果你不需要去掉表的前缀，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('')
        }
    }
    
    //生成序列化的serialVersionUID 
    static String genSerialID() {
        return "\tprivate static final long serialVersionUID =  " + Math.abs(new Random().nextLong()) + "L;"
    }

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