自动生成小工具（二）：根据建表sql自动生成增删改查sql语句文件

Mybatis自动生成插件虽然功能强大，但是也略显笨重。我自己开发了一个自动生成的小工具，更加简单，更加轻量级。
一共只有几百行代码，想改的话，直接修改即可。根据自己的实际情况，可以进行灵活的二次开发。

Talk is cheap，show me the code.

自己写的，可以直接跑。如有问题，请联系，谢谢。

一，程序入口核心类：GenSqlXml.java

package cn.sephora.product.elasticsearch.service.impl;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;/*** 功能：根据mysql建表语句文件（XXX.sql），自动生成mapper文件（XXXMapper.xml）* @date 2019/12/13* @address shanghai**/
public class GenSqlXml {/*** 源文件路径*/private static final String SOURCE_FILE_PATH = "D:\\sourcefile\\";/*** 源文件名称*/private static final String SOURCE_FILE_NAME = "table_create";/*** 源文件后缀*/private static final String SOURCE_FILE_SUFFIX = "sql";/*** 目标文件路径*/private static final String TARGET_FILE_PATH = "D:\\targetfile\\";/*** 目标文件名称*/private static final String TARGET_FILE_NAME = "SqlMapper";/*** 目标文件后缀*/private static final String TARGET_FILE_SUFFIX = "xml";/***  换行符*/private static final String LINE_BREAK = "\r\n";/***  sqlxml文件的namespace*/private static final String NAMESPACE = "cn.xxx.xxx.dao.StoreActivityDao";public static void main(String[] args) {File fileObj = new File(SOURCE_FILE_PATH + SOURCE_FILE_NAME + "." + SOURCE_FILE_SUFFIX);ParseSqlFile parseSqlFile = new ParseSqlFile();TableInfo tableInfo = parseSqlFile.getFieldInfo(fileObj);GenSqlXml genSqlXml = new GenSqlXml();genSqlXml.genSqlXmlFile(tableInfo);}public void genSqlXmlFile(TableInfo tableInfo) {genTargetSqlXmlFile(tableInfo);}private void genTargetSqlXmlFile(TableInfo tableInfo) {FileOutputStream fos = null;try {File f1 = new File(TARGET_FILE_PATH + TARGET_FILE_NAME + "." + TARGET_FILE_SUFFIX);if (!f1.exists()){f1.getParentFile().mkdirs();}fos = new FileOutputStream(f1);// 生成文件头fos.write(("<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + LINE_BREAK).getBytes());fos.write(("<!DOCTYPE mapper" + LINE_BREAK).getBytes());fos.write(("    PUBLIC \"-//mybatis.org//DTD Mapper 3.0//EN\"" + LINE_BREAK).getBytes());fos.write(("    \"http://mybatis.org/dtd/mybatis-3-mapper.dtd\">" + LINE_BREAK).getBytes());fos.write(("<mapper namespace=\"" + NAMESPACE + "\">" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());// 生成select语句genSelet(fos, tableInfo);// 生成insert语句genInsert(fos, tableInfo);// 生成update语句genUpdate(fos, tableInfo);// 生成delete语句genDelete(fos, tableInfo);// 生成文件尾部fos.write(("</mapper>" + LINE_BREAK).getBytes());} catch (IOException e) {System.out.println("catch " + e);} finally {try {fos.close();} catch (IOException e) {System.out.println("finally " + e);}}}/*** 生成select语句* @param fos* @param tableInfo*/private void genSelet(FileOutputStream fos, TableInfo tableInfo){List<FieldInfo> list = tableInfo.getFieldList();String resultMapId = "BaseResultMap";try {// <resultMap>fos.write(("    <resultMap id=" + resultMapId + " type=\"cn.xxx.xxx.dao.model.MktResourceModel\">" + LINE_BREAK).getBytes());fos.write(("            <id column=\"" + tableInfo.getPrimaryKeyDB() + "\" property=\"" + tableInfo.getPrimaryKeyJava() + "\" jdbcType=\"" + tableInfo.getPrimaryKeyDataType().toUpperCase() + "\" />" + LINE_BREAK).getBytes());for (FieldInfo fieldInfo : list) {fos.write(("            <result column=\"" + fieldInfo.getFieldNameDB() + "\" property=\"" + fieldInfo.getFieldNameJava() + "\" jdbcType=\"" + fieldInfo.getDataTypeMysql().toUpperCase() + "\" />" + LINE_BREAK).getBytes());}fos.write(("    </resultMap>" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());// <sql>StringBuffer fieldListDBStr = new StringBuffer();fos.write(("    <sql id=\"Base_Column_List\">" + LINE_BREAK).getBytes());for (FieldInfo fieldInfo : list) {fieldListDBStr.append(fieldInfo.getFieldNameDB()).append(",");}fos.write(("        " + fieldListDBStr.substring(0, fieldListDBStr.lastIndexOf(",")).toString() + LINE_BREAK).getBytes());fos.write(("    </sql>" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());// <select>fos.write(("    <select id=\"selectByPrimaryKey\" resultMap=\"BaseResultMap\" parameterType=\"java.lang.String\">" + LINE_BREAK).getBytes());fos.write(("        select <include refid=\"" + resultMapId + "\" />" + LINE_BREAK).getBytes());fos.write(("        from " + tableInfo.getTableName() + LINE_BREAK).getBytes());fos.write(("        where " + tableInfo.getPrimaryKeyDB() + " = #{" + tableInfo.getPrimaryKeyJava() + ",jdbcType=" + tableInfo.getPrimaryKeyDataType().toUpperCase() + "}" + LINE_BREAK).getBytes());fos.write(("    </sql>" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());} catch (IOException e) {System.out.println("genSelect IOException " + e);}}/*** 生成insert语句* @param fos* @param tableInfo*/private void genInsert(FileOutputStream fos, TableInfo tableInfo){String tableName = tableInfo.getTableName();String primaryKeyDB = tableInfo.getPrimaryKeyDB();List<FieldInfo> list = tableInfo.getFieldList();StringBuffer fieldListDBStr = new StringBuffer();StringBuffer fieldListJavaStr = new StringBuffer();for (FieldInfo fieldInfo : list) {fieldListDBStr.append(fieldInfo.getFieldNameDB()).append(",");fieldListJavaStr.append("#{").append(fieldInfo.getFieldNameJava()).append("},");}String fieldListDBStrFinal = fieldListDBStr.toString().substring(0, fieldListDBStr.toString().length() - 1);String fieldListJavaStrFinal = fieldListJavaStr.toString().substring(0, fieldListJavaStr.toString().length() - 1);try {fos.write(("    <insert id=\"insert\" parameterType=\"cn.xxx.xxx.dao.model.StoreModel\">" + LINE_BREAK).getBytes());fos.write(("        insert into " + tableName + " (" + fieldListDBStrFinal + ")" + LINE_BREAK).getBytes());fos.write(("        select " + " " + fieldListJavaStrFinal + LINE_BREAK).getBytes());fos.write(("        from dual" + LINE_BREAK).getBytes());fos.write(("        where not exists(select " + primaryKeyDB + " from " + tableName +  " where " + primaryKeyDB + " = #{" + tableInfo.getPrimaryKeyJava() + "}" + LINE_BREAK).getBytes());fos.write(("\t</insert>" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());} catch (IOException e) {System.out.println("genInsert IOException " + e);}}/*** 生成update语句* 注意：update语句，需要执行jdbcType* @param fos* @param tableInfo*/private void genUpdate(FileOutputStream fos, TableInfo tableInfo){String tableName = tableInfo.getTableName();String primaryKeyDB = tableInfo.getPrimaryKeyDB();List<FieldInfo> list = tableInfo.getFieldList();try {fos.write(("    <update id=\"updateByPrimaryKey\" parameterType=\"cn.xxx.xxx.dao.model.StoreActivityModel\">" + LINE_BREAK).getBytes());fos.write(("        update " + tableName + LINE_BREAK).getBytes());fos.write(("        <set>" + LINE_BREAK).getBytes());for (FieldInfo fieldInfo : list) {fos.write(("            <if test=\"" + fieldInfo.getFieldNameJava() + " != null\">" + LINE_BREAK).getBytes());fos.write(("                " + fieldInfo.getFieldNameDB() + " = #{" + fieldInfo.getFieldNameJava() + ",jdbcType=" + fieldInfo.getDataTypeMysql().toUpperCase() + "}" + LINE_BREAK).getBytes());fos.write(("            </if>" + LINE_BREAK).getBytes());}fos.write(("        </set>" + LINE_BREAK).getBytes());fos.write(("        where " + primaryKeyDB + " = #{" + tableInfo.getPrimaryKeyJava() + ",jdbcType=" + tableInfo.getPrimaryKeyDataType().toUpperCase() + "}" + LINE_BREAK).getBytes());fos.write(("    </update>" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());} catch (IOException e) {System.out.println("genUpdate IOException " + e);}}/*** 生成delete语句* @param fos* @param tableInfo*/private void genDelete(FileOutputStream fos, TableInfo tableInfo){try {fos.write(("    <delete id=\"deleteByPrimaryKey\" parameterType=\"String\">" + LINE_BREAK).getBytes());fos.write(("        delete from " + tableInfo.getTableName() + " where " + tableInfo.getPrimaryKeyDB() + " = #{" + tableInfo.getPrimaryKeyJava() + "}" + LINE_BREAK).getBytes());fos.write(("    </delete>" + LINE_BREAK).getBytes());fos.write(LINE_BREAK.getBytes());} catch (IOException e) {System.out.println("genDelete IOException " + e);}}}

二，建表语句文件解析类：ParseSqlFile.java

package cn.sephora.product.elasticsearch.service.impl;import org.apache.commons.lang.StringUtils;import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** @description 解析建表sql文件，生成对应的封装对象TableInfo* @date 2019/12/13* @address shanghai**/
public class ParseSqlFile {/*** Mysql建表语句关键字*/private final static Map<String, String> MYSQL_KEY_WORD_MAP = new HashMap();static {MYSQL_KEY_WORD_MAP.put("ENGINE", "ENGINE");MYSQL_KEY_WORD_MAP.put("CHARACTER", "CHARACTER");MYSQL_KEY_WORD_MAP.put("COLLATE", "COLLATE");}/*** 解析sql建表语句文件，得到FieldInfo集合* @param fileObj* @return*/public TableInfo getFieldInfo(File fileObj) {BufferedReader reader = null;InputStream in = null;TableInfo tableInfo = new TableInfo();List<FieldInfo> list = new ArrayList<>();List<FieldInfo> listParsed = null;try {reader = new BufferedReader(new FileReader(fileObj));in = new FileInputStream(fileObj);String line = null;int count = 0;while((line  = reader.readLine()) != null) {// 第一行if (line.toUpperCase().contains("CREATE TABLE")) {tableInfo.setTableName(parseTableName(line));continue;}// PRIMARY KEY 行if (line.toUpperCase().contains("PRIMARY KEY")) {tableInfo.setPrimaryKeyDB(line.substring(line.indexOf("(") + 1, line.indexOf(")")));continue;}// 建表语句结束的右括号 行if (line.trim().startsWith(")")) {continue;}// 表备注信息if (line.trim().toUpperCase().startsWith("COMMENT")) {continue;}boolean keyWordFlag = false;for (Map.Entry<String, String> entry : MYSQL_KEY_WORD_MAP.entrySet()) {if (line.toUpperCase().contains(entry.getKey())) {keyWordFlag = true;break;}}if (keyWordFlag){continue;}// 递归处理，拿到字段名/字段类型/字段备注信息，然后存入ArrayListparseFiledInfo(line, list);}listParsed = convertMysql2Java(list, tableInfo);tableInfo.setFieldList(listParsed);} catch (IOException e) {System.out.println(" catch 分支 IOException " + e);} finally {try {in.close();} catch (IOException e){System.out.println(" finally 分支 IOException " + e);}}return tableInfo;}private String parseTableName(String line) {return line.replaceFirst("CREATE", "").replaceFirst("TABLE", "").replaceFirst("\\(", "").trim().toLowerCase();}private List<FieldInfo> parseFiledInfo(String line, List<FieldInfo> list) {// 去掉每行前面的空格String lineWithoutFrontBlank = parLineFrontBlank(line);// 字段名String fieldNameDB = lineWithoutFrontBlank.substring(0, lineWithoutFrontBlank.indexOf(" "));// 字段备注信息String comment = lineWithoutFrontBlank.substring(lineWithoutFrontBlank.indexOf("'") + 1, lineWithoutFrontBlank.lastIndexOf("'"));String lineNotStartsWithBlankAndFieldName = parLineFrontBlank(lineWithoutFrontBlank.substring(lineWithoutFrontBlank.indexOf(" ")));// 字段数据类型String dataTypeMysql = lineNotStartsWithBlankAndFieldName.substring(0, lineNotStartsWithBlankAndFieldName.indexOf(" "));// 去掉数据类型后面的括号内容if (dataTypeMysql.trim().endsWith(")")) {dataTypeMysql = dataTypeMysql.substring(0, dataTypeMysql.indexOf("("));}FieldInfo fieldInfo = new FieldInfo(fieldNameDB, null, dataTypeMysql, null, comment);list.add(fieldInfo);return list;}/*** 递归去掉每行前面的空格* @param tempStr* @return*/private String parLineFrontBlank(String tempStr) {if (tempStr.startsWith(" ")) {String newTempStr = tempStr.substring(1);return parLineFrontBlank(newTempStr);}return tempStr;}private List<FieldInfo> convertMysql2Java(List<FieldInfo> list, TableInfo tableInfo) {List<FieldInfo> listParsed = new ArrayList<>();for (FieldInfo fieldInfo : list) {// 如果该字段是主键if (StringUtils.equals(fieldInfo.getFieldNameJava(), tableInfo.getPrimaryKeyJava())) {tableInfo.setPrimaryKeyJava(mappingMysqlFieldName2Java(tableInfo.getPrimaryKeyDB()));tableInfo.setPrimaryKeyDataType(fieldInfo.getDataTypeMysql());}// mysql字段转java字段fieldInfo.setFieldNameJava(mappingMysqlFieldName2Java(fieldInfo.getFieldNameDB()));// mysql字段类型 转 java 数据类型fieldInfo.setDataTypeJava(mappingMysqlDataType2Java(fieldInfo.getDataTypeMysql()));listParsed.add(fieldInfo);}return listParsed;}private String mappingMysqlDataType2Java(String dataTypeMysql) {// 字符串if (MysqlDataTypeConstants.MYSQL_DATA_TYPE_VARCHAR.containsValue(dataTypeMysql.toLowerCase())) {return "String";}// 整形if (MysqlDataTypeConstants.MYSQL_DATA_TYPE_INT.containsValue(dataTypeMysql.toLowerCase())) {return "Integer";}// 长整形if (MysqlDataTypeConstants.MYSQL_DATA_TYPE_LONG.containsValue(dataTypeMysql.toLowerCase())) {return "Long";}// dateif (MysqlDataTypeConstants.MYSQL_DATA_TYPE_DATE.containsValue(dataTypeMysql.toLowerCase())) {return "Date";}return dataTypeMysql;}/*** Mysql字段名称转java字段名称* @param filedName* @return*/private String mappingMysqlFieldName2Java(String filedName) {// 去掉数据类型后面的括号内容if (!filedName.contains("_")) {return filedName;}return parseUnderLine(filedName);}/*** 递归处理Mysql字段名称中的下划线*/private String parseUnderLine(String filedName) {int underLineIndex = filedName.indexOf("_");String parsedFieldName = filedName.replaceFirst(filedName.substring(underLineIndex, underLineIndex + 2), filedName.substring(underLineIndex + 1, underLineIndex + 2).toUpperCase());if (!parsedFieldName.contains("_")) {return parsedFieldName;}return parseUnderLine(parsedFieldName);}}

三，建表语句中所有表字段封装实体类：FieldInfo.java

package cn.sephora.product.elasticsearch.service.impl;/*** @description 字段数据接口* @date 2019/12/13* @address shanghai**/
public class FieldInfo {/*** 字段名（数据库字段格式）*/private String fieldNameDB;/*** 字段名（java驼峰格式）*/private String fieldNameJava;/*** mysql数据类型*/private String dataTypeMysql;/*** java数据类型*/private String dataTypeJava;/*** 字段conmment备注信息*/private String comment;public FieldInfo(String fieldNameDB, String fieldNameJava, String dataTypeMysql, String dataTypeJava, String comment) {this.fieldNameDB = fieldNameDB;this.fieldNameJava = fieldNameJava;this.dataTypeMysql = dataTypeMysql;this.dataTypeJava = dataTypeJava;this.comment = comment;}public String getFieldNameDB() {return fieldNameDB;}public void setFieldNameDB(String fieldNameDB) {this.fieldNameDB = fieldNameDB;}public String getFieldNameJava() {return fieldNameJava;}public void setFieldNameJava(String fieldNameJava) {this.fieldNameJava = fieldNameJava;}public String getDataTypeMysql() {return dataTypeMysql;}public void setDataTypeMysql(String dataTypeMysql) {this.dataTypeMysql = dataTypeMysql;}public String getDataTypeJava() {return dataTypeJava;}public void setDataTypeJava(String dataTypeJava) {this.dataTypeJava = dataTypeJava;}public String getComment() {return comment;}public void setComment(String comment) {this.comment = comment;}
}

四，建表语句对应实体类：TableInfo.java

package cn.sephora.product.elasticsearch.service.impl;import java.util.List;/*** @description 解析建表sql生成的对象* @date 2019/12/13* @address shanghai**/
public class TableInfo {/*** 表名*/private String tableName;/*** 主键（数据库字段名格式）*/private String primaryKeyDB;/*** 主键（java驼峰命名格式）*/private String primaryKeyJava;/*** 主键的数据类型*/private String primaryKeyDataType;/*** 表字段集合*/private List<FieldInfo> fieldList;public String getTableName() {return tableName;}public void setTableName(String tableName) {this.tableName = tableName;}public String getPrimaryKeyDB() {return primaryKeyDB;}public void setPrimaryKeyDB(String primaryKeyDB) {this.primaryKeyDB = primaryKeyDB;}public String getPrimaryKeyJava() {return primaryKeyJava;}public void setPrimaryKeyJava(String primaryKeyJava) {this.primaryKeyJava = primaryKeyJava;}public String getPrimaryKeyDataType() {return primaryKeyDataType;}public void setPrimaryKeyDataType(String primaryKeyDataType) {this.primaryKeyDataType = primaryKeyDataType;}public List<FieldInfo> getFieldList() {return fieldList;}public void setFieldList(List<FieldInfo> fieldList) {this.fieldList = fieldList;}
}

五，常量定义类：MysqlDataTypeConstants.java

package cn.sephora.product.elasticsearch.service.impl;import java.util.HashMap;
import java.util.Map;/*** @description 常量定义* @date 2019/12/13* @address shanghai**/
public class MysqlDataTypeConstants {/*** Mysql数据类型之字符串*/public final static Map<String, String> MYSQL_DATA_TYPE_VARCHAR = new HashMap();static {MYSQL_DATA_TYPE_VARCHAR.put("varchar", "varchar");MYSQL_DATA_TYPE_VARCHAR.put("json", "json");MYSQL_DATA_TYPE_VARCHAR.put("char", "char");}/*** Mysql数据类型之整形*/public final static Map<String, String> MYSQL_DATA_TYPE_INT = new HashMap();static {MYSQL_DATA_TYPE_INT.put("int", "int");MYSQL_DATA_TYPE_INT.put("bit", "bit");}/*** Mysql数据类型之长整形*/public final static Map<String, String> MYSQL_DATA_TYPE_LONG = new HashMap();static {MYSQL_DATA_TYPE_LONG.put("bigint", "bigint");MYSQL_DATA_TYPE_LONG.put("long", "long");}/*** Mysql数据类型之整形*/public final static Map<String, String> MYSQL_DATA_TYPE_DATE = new HashMap();static {MYSQL_DATA_TYPE_DATE.put("datetime", "datetime");MYSQL_DATA_TYPE_DATE.put("timestamp", "timestamp");}}

六，sql文件模板：table_create.sql

注意，这个文件的路径是：D:\sourcefile，如果需要修改，请把源码中的对应路径也修改掉。

CREATE TABLE product_info (   product_id  bigint COMMENT '产品编号' NOT NULL,product_name varchar(128) COMMENT '产品名称' NOT NULL,status varchar(20) COMMENT '产品状态 0-未上架 1-已上架 2-已下架 3-已删除',create_time timestamp COMMENT '创建时间' NOT NULL,update_time timestamp COMMENT '最后更新时间' NOT NULL,   PRIMARY KEY(activity_id) USING BTREE
)
COMMENT = '产品信息'
ENGINE = InnoDB
CHARACTER SET utf8mb4
COLLATE utf8mb4_general_ci;

七，运行生成的model文件示例SqlMapper.xml

默认生成文件的路径是：D:\targetfile，如果需要修改，请把源码中的对应路径也修改掉。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.xxx.xxx.dao.StoreActivityDao"><resultMap id=BaseResultMap type="cn.xxx.xxx.dao.model.MktResourceModel"><id column="activity_id" property="activityId" jdbcType="BIGINT" /><result column="product_id" property="productId" jdbcType="BIGINT" /><result column="product_name" property="productName" jdbcType="VARCHAR" /><result column="status" property="status" jdbcType="VARCHAR" /><result column="create_time" property="createTime" jdbcType="TIMESTAMP" /><result column="update_time" property="updateTime" jdbcType="TIMESTAMP" /></resultMap><sql id="Base_Column_List">product_id,product_name,status,create_time,update_time</sql><select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.String">select <include refid="BaseResultMap" />from product_infowhere activity_id = #{activityId,jdbcType=BIGINT}</sql><insert id="insert" parameterType="cn.xxx.xxx.dao.model.StoreModel">insert into product_info (product_id,product_name,status,create_time,update_time)select  #{productId},#{productName},#{status},#{createTime},#{updateTime}from dualwhere not exists(select activity_id from product_info where activity_id = #{activityId}</insert><update id="updateByPrimaryKey" parameterType="cn.xxx.xxx.dao.model.StoreActivityModel">update product_info<set><if test="productId != null">product_id = #{productId,jdbcType=BIGINT}</if><if test="productName != null">product_name = #{productName,jdbcType=VARCHAR}</if><if test="status != null">status = #{status,jdbcType=VARCHAR}</if><if test="createTime != null">create_time = #{createTime,jdbcType=TIMESTAMP}</if><if test="updateTime != null">update_time = #{updateTime,jdbcType=TIMESTAMP}</if></set>where activity_id = #{activityId,jdbcType=BIGINT}</update><delete id="deleteByPrimaryKey" parameterType="String">delete from product_info where activity_id = #{activityId}</delete></mapper>

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