本文主要是介绍解析mysql的DDL语句生成高斯内表及表字段主键配置，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
mysql的DDL语句如下:
CREATE TABLE `gg_zr` (`id` bigint(20) NOT NULL COMMENT '责任信息表主键id',`zrdm` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '责任代码',`zrmc` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '责任名称',`delflag` char(1) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '0' COMMENT '删除标志(0.存在;1.删除)',`version` int(11) DEFAULT '1' COMMENT '版本号',`createby` bigint(20) DEFAULT NULL COMMENT '创建人',`createtime` datetime DEFAULT NULL COMMENT '创建时间',`updateby` bigint(20) DEFAULT NULL COMMENT '修改人',`updatetime` datetime DEFAULT NULL COMMENT '修改时间',PRIMARY KEY (`id`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci ROW_FORMAT=DYNAMIC COMMENT='责任信息表';
解析oracle表生成高斯内表入口:Mysql2GaussCreateMana.scala
package com.tpiods.sqoop.mysql2gaussimport java.io.{File, FileInputStream, PrintWriter}
/*** 读取mysql建表语句,生成高斯内表* 读取oceanbase建表语句,生成高斯内表* 仅93行提取主键的逻辑,mysql与oceanbase有差异*/
object Mysql2GaussCreateMana {def main(args: Array[String]): Unit = {// 指定输入sql语句的文件val input = "ods_etl/src/main/resources/work0409_test1/test1_tab.sql"val lines = scala.io.Source.fromInputStream(new FileInputStream(input)).getLines()val str = readSql(lines)val result = replaceSql(str)// 读上一步输出的文件val str2 = addTeacCols3(result)// 指定输出sql语句的文件(增加技术字段)val output2 = "ods_etl/src/main/resources/work0409_test1/test1_tab_mana.sql"val writer2 = new PrintWriter(new File(output2))writer2.write(str2)writer2.close()}/**** @param lines 从文件读入的源系统建表语句* @return 返回转换后的建表语句*/def readSql(lines: Iterator[String]): String = {var first = 0val sb = new StringBuildervar pkName: String = nullfor (line <- lines if line != null) {if(line.startsWith("CREATE")) {val tabName = line.split("\\s+")(2)first += 1if (sb.nonEmpty) {// 不按主键做hash,则注释掉下面这段代码sb.append(s"""|)|with (orientation=column, compression=low)|distribute by hash${pkName};""".stripMargin)sb.append(s"""||set search_path = ods;|drop table if exists ${tabName};|create table if not exists ${tabName} (\t|""".stripMargin)}else {sb.append(s"""||set search_path = tpods;|drop table if exists ${tabName};|create table if not exists ${tabName} (\t|""".stripMargin)}}if (line.startsWith(" `")) {val split = line.split("\\s+")if (first == 1) {val ln = (split(1) + "\t" + split(2)).toLowerCaseif (ln.indexOf("char(") > 0) {val l1 = ln.split("\\(")(0)val l2 = ln.split("\\(")(1)val l3 = l2.substring(0, l2.length - 1)val l4 = Integer.valueOf(l3) * 3sb.append(l1).append("(").append(l4).append(")")}else sb.append(split(1)).append("\t").append(split(2))}else {val ln = (split(1) + "\t" + split(2)).toLowerCaseif (ln.indexOf("char(") > 0) {val l1 = ln.split("\\(")(0)val l2 = ln.split("\\(")(1)val l3 = l2.substring(0, l2.length - 1)val l4 = Integer.valueOf(l3) * 3sb.append(",").append(l1).append("(").append(l4).append(")")}else sb.append(",").append(split(1)).append("\t").append(split(2))}sb.append("\n")first = 0}if (line.startsWith(" PRIMARY KEY")) {//取mysql 主键pkName = line.split("\\s+")(3)}}sb +s"""|)|WITH (orientation=column, compression=low)|distribute by hash${pkName};|""".stripMargin// 不按主键做hash,打开下面这段代码
// sb.toString()}/**** @param sql 读入转换后的sql* @return 对字段类型进行替换,返回最终的sql*/def replaceSql(sql: String): String = {val res = sql.toLowerCase.replaceAll("`", "").replaceAll("\\b" + "datetime" + "\\b", "date").replaceAll("tinyint\\(\\d*\\)", "int").replaceAll("smallint\\(\\d*\\)", "int").replaceAll("int\\(\\d*\\)", "int").replaceAll("bigint\\(\\d*\\)", "bigint").replaceAll("float\\(\\d*,\\d*\\)", "float").replaceAll("double\\(\\d*,\\d*\\)", "float").replaceAll("timestamp\\(\\d*\\)", "timestamp").replaceAll("date\\(\\d*\\)", "date").replaceAll("\\b" + "longtext" + "\\b", "text").replaceAll("\\b" + "longblob" + "\\b", "varchar").replaceAll(",\n", "\n").replaceAll("mediumtext", "text")res + "\n"}/*** 按主键做hash* @param lines2 读入字段类型替换后的sql* @return 字段后面增加技术字段*/def addTeacCols(lines2: String): String = {lines2.replaceAll("\n\\)\nwith",""",oper varchar|,mtime numeric(38,5)|,source_sys varchar|,etl_time varchar|,etl_date varchar|)|with""".stripMargin)}/*** 不按主键做hash,调用这个方法* @param lines2 读入字段类型替换后的sql* @return 字段后面增加技术字段*/def addTeacCols2(lines2: String): String = {lines2.replaceAll("\\);",""",oper varchar|,mtime numeric(38,5)|,source_sys varchar|,etl_time varchar|,etl_date varchar|);|""".stripMargin)}/*** 按主键做hash* @param lines2 读入字段类型替换后的sql* @return 字段前面增加技术字段*/def addTeacCols3(lines2: String): String = {lines2.replaceAll("\t\n","""| tabname varchar|,oper varchar|,mtime numeric(38,5)|,source_sys varchar|,etl_time varchar|,etl_date varchar|,""".stripMargin)}/*** 不按主键做hash,调用这个方法* @param lines2 读入字段类型替换后的sql* @return 字段前面增加技术字段*/def addTeacCols4(lines2: String): String = {lines2.replaceAll("\t\n","""| tabname varchar|,oper varchar|,mtime numeric(38,5)|,source_sys varchar|,etl_time varchar|,etl_date varchar|,""".stripMargin)}}运行以上代码,输出如下:
set search_path = ods;
drop table if exists gg_zr;
create table if not exists gg_zr (
tabname varchar
,oper varchar
,mtime numeric(38,5)
,source_sys varchar
,etl_time varchar
,etl_date varchar
,id bigint
,zr_dm varchar(96)
,zr_mc varchar(192)
,del_flag char(3)
,version int
,create_by bigint
,create_time date
,update_by bigint
,update_time date
)
with (orientation=column, compression=low)
distribute by hash(id);
解析oracle表生成表名字段主键配置入口:MysqlGeneTabColsPk.scala
package com.tpiods.sqoop.mysql2gaussimport java.io.{File, FileInputStream, PrintWriter}
/*** 输入: 源系统建表语句* 输出: 表名|列名...|主键* 仅36行提取主键的逻辑,mysql与oceanbase有差异*/
object MysqlGeneTabColsPk {def main(args: Array[String]): Unit = {// 指定输入sql语句的文件val input = "ods_etl/src/main/resources/work0409_test1/test1_tab.sql"val lines = scala.io.Source.fromInputStream(new FileInputStream(input)).getLines()val str = readSql(lines)// 指定输出sql语句的文件val output1 = "ods_etl/src/main/resources/work0409_test1/test1_tab_tabcolspk.txt"val writer = new PrintWriter(new File(output1))writer.write(str)writer.close()}def readSql(lines: Iterator[String]): String = {val sb = new StringBuilderfor (tempString <- lines if tempString != null) {if (tempString.startsWith("CREATE")) {val tabName = tempString.split("TABLE `")(1)sb.append("\n").append(tabName).append("|")}if (tempString.startsWith(" `")) {val colName = tempString.split("\\s+")(1)sb.append(colName).append(",")}if (tempString.startsWith(" PRIMARY KEY")) {
// var pkName = tempString.split("\\s+")(3)//取oceanbase 主键var pkName = tempString.replaceAll(" PRIMARY KEY ", "")if (pkName.endsWith(",")) {pkName = pkName.substring(0, pkName.length - 1).replaceAll(" ", "")}sb.append("|").append(pkName)}}sb.toString().toLowerCase().replaceAll("` ", "").replaceAll("`", "").replaceAll("\\(", "").replaceAll("\\)", "").replaceAll(",\\|", "\\|").replaceAll(",\n", "\n")}}运行以上代码,输出如下:
gg_zr|id,zr_dm,zr_mc,del_flag,version,create_by,create_time,update_by,update_time|id
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