Adding generator app

.gitignore

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+######################
+# Project Specific
+######################
+/src/main/webapp/content/css/main.css
+/target/classes/static/**
+/src/test/javascript/coverage/
+
+
+
+######################
+# Eclipse
+######################
+*.pydevproject
+.project
+.metadata
+tmp/
+tmp/**/*
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.classpath
+.settings/
+.loadpath
+.factorypath
+/src/main/resources/rebel.xml
+
+# External tool builders
+.externalToolBuilders/**
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# CDT-specific
+.cproject
+
+# PDT-specific
+.buildpath
+
+# STS-specific
+/.sts4-cache/*
+
+######################
+# IntelliJ
+######################
+.idea/
+*.iml
+*.iws
+*.ipr
+*.ids
+*.orig
+classes/
+out/
+
+######################
+# Visual Studio Code
+######################
+.vscode/
+
+######################
+# Maven
+######################
+/log/
+/target/
+
+######################
+# Gradle
+######################
+.gradle/
+/build/
+
+######################
+# Package Files
+######################
+*.jar
+*.war
+*.ear
+*.db
+
+######################
+# Windows
+######################
+# Windows image file caches
+Thumbs.db
+
+# Folder config file
+Desktop.ini
+
+######################
+# Mac OSX
+######################
+.DS_Store
+.svn
+
+# Thumbnails
+._*
+
+# Files that might appear on external disk
+.Spotlight-V100
+.Trashes
+
+######################
+# Directories
+######################
+/bin/
+/deploy/
+
+######################
+# Logs
+######################
+*.log*
+
+######################
+# Others
+######################
+*.class
+*.*~
+*~
+.merge_file*
+
+######################
+# Gradle Wrapper
+######################
+!gradle/wrapper/gradle-wrapper.jar
+
+######################
+# Maven Wrapper
+######################
+!.mvn/wrapper/maven-wrapper.jar
+
+######################
+# ESLint
+######################
+.eslintcache

README.md

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+# Script Generator
+
+This small app helps to generate DDL statements from the excel file
+
+## Usage
+
+Before you start to generate the scripts, follow below
+1. Java: The running machine should have at least java 8 installed
+2. File: The sample xlxs file is located in resources folder. This can be modified as but the format should remain the same
+3. Open the application in any IDE (eclipse / Intellij)
+4. Right click on App.java and run
+5. The scripts will be generated in the console log
+
+
+> Note: `id` column will be auto generated for all tables

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>scripts-generator</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
+        <dependency>
+            <groupId>org.apache.poi</groupId>
+            <artifactId>poi</artifactId>
+            <version>4.1.2</version>
+        </dependency>
+
+        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.4</version>
+        </dependency>
+
+        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
+        <dependency>
+            <groupId>org.apache.poi</groupId>
+            <artifactId>poi-ooxml</artifactId>
+            <version>4.1.2</version>
+        </dependency>
+
+        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
+        <dependency>
+            <groupId>org.apache.poi</groupId>
+            <artifactId>poi-ooxml-schemas</artifactId>
+            <version>4.1.2</version>
+        </dependency>
+
+
+
+
+
+    </dependencies>
+
+</project>

src/main/java/App.java

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+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Iterator;
+
+public class App {
+    public static void main(String args[]) throws IOException
+    {
+        //obtaining input bytes from a file
+        App tc = new App();
+
+        InputStream fis = tc.getClass().getClassLoader().getResourceAsStream("Data_Dictionary.xlsx");
+
+        //creating workbook instance that refers to .xls file
+        XSSFWorkbook wb=new XSSFWorkbook(fis);
+        //creating a Sheet object to retrieve the object
+        XSSFSheet sheet = wb.getSheetAt(0);     //creating a Sheet object to retrieve object
+        Iterator<Row> itr = sheet.iterator();    //iterating over excel file
+
+        String prevTableName = "";
+
+        int rowCount = 0;
+
+        StringBuilder sb = new StringBuilder();
+        StringBuilder foreignKeyBuilder = new StringBuilder();
+
+        while (itr.hasNext())
+        {
+
+            Row row = itr.next();
+
+            // Skip first row. It's header
+            if(rowCount == 0){
+                rowCount++;
+                continue;
+            }
+
+            String tempTableName = "";
+
+
+
+            tempTableName = row.getCell(0).getStringCellValue();
+
+            if(tempTableName !=null && tempTableName.length() > 0){
+
+                if(!tempTableName.equals(prevTableName)){
+
+
+                    System.out.println(_finishOffCreate(sb.append(foreignKeyBuilder.toString())));
+                    sb = new StringBuilder();
+                    foreignKeyBuilder = new StringBuilder();
+
+
+                    sb.append(Constants.CREATE_TABLE +
+                            tempTableName +
+                            Constants.BRACKET_OPEN +
+                            Constants.NEW_LINE);
+
+                    sb.append(Constants.constructColumn(
+                            "id",
+                            "bigint,\n"
+                    ));
+
+
+                    sb.append(Constants.constructColumn(
+                            row.getCell(1).getStringCellValue(),
+                            row.getCell(2).getStringCellValue()
+                    ));
+                    sb.append(Constants.COMMA + Constants.NEW_LINE);
+
+                    _buildForeignKeys(row, foreignKeyBuilder);
+
+                    prevTableName = tempTableName;
+                }else{
+                    sb.append(Constants.constructColumn(
+                            row.getCell(1).getStringCellValue(),
+                            row.getCell(2).getStringCellValue()
+                    ));
+
+                    _buildForeignKeys(row, foreignKeyBuilder);
+
+                    sb.append(Constants.COMMA + Constants.NEW_LINE);
+                }
+
+            }
+            rowCount++;
+        }
+    }
+
+    private static void _buildForeignKeys(Row row, StringBuilder foreignKeyBuilder) {
+        // Check for any foreign keys
+        if( row.getCell(3) != null && "Y".equalsIgnoreCase(row.getCell(3).getStringCellValue()) ){
+            String currentTableName = row.getCell(0).getStringCellValue();
+            String parentTableName = row.getCell(4).getStringCellValue();
+
+            foreignKeyBuilder.append(
+                    Constants.SPACE + Constants.SPACE + Constants.SPACE +
+
+                    Constants.CONSTRAINT + Constants.SPACE +
+
+                    (Constants.FK_PREFIX + Constants.UNDERSCORE +
+                            currentTableName.substring(0,8) + Constants.UNDERSCORE +
+                            parentTableName.substring(0,8) +
+                            Constants.SPACE + Constants.NEW_LINE ) +
+
+                    Constants.SPACE + Constants.SPACE + Constants.SPACE + Constants.SPACE +
+
+                    Constants.FOREIGN_KEY+
+
+                    (Constants.BRACKET_OPEN + row.getCell(1).getStringCellValue() + Constants.BRACKET_CLOSE)+ Constants.SPACE +
+
+                    Constants.REFERENCES + Constants.SPACE +
+
+                    (row.getCell(5).getStringCellValue() + Constants.BRACKET_OPEN + row.getCell(1).getStringCellValue() + Constants.BRACKET_CLOSE)+
+
+                    Constants.COMMA + Constants.NEW_LINE);
+        }
+    }
+
+    private static String _finishOffCreate(StringBuilder createStatement){
+
+        if(createStatement.length() > 0){
+//            System.out.println(createStatement.toString());
+            int lastIndexOfComma=createStatement.lastIndexOf(Constants.COMMA);
+
+            createStatement.deleteCharAt(lastIndexOfComma);
+
+            createStatement.append( Constants.BRACKET_CLOSE + Constants.SEMI_COLON + Constants.NEW_LINE);
+
+
+            createStatement.replace(lastIndexOfComma, lastIndexOfComma, "");
+            return createStatement.toString();
+        }
+        return "";
+    }
+}

src/main/java/Constants.java

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+import com.sun.org.apache.bcel.internal.generic.NEW;
+
+public class Constants {
+    public static final String CREATE_TABLE="CREATE TABLE ";
+    public static final String BRACKET_OPEN="(";
+    public static final String BRACKET_CLOSE=")";
+    public static final String SPACE="\t";
+    public static final String NEW_LINE="\n";
+    public static final String COMMA=",";
+
+
+    //Data types
+    public static final String TYPE_VARCHAR="VARCHAR";
+    public static final String TYPE_INT="INT";
+    public static final String TYPE_DECIMAL="DECIMAL";
+    public static final String TYPE_DATETIME="DATETIME";
+    public static final String TYPE_DATE="DATE";
+    public static final String BIT="bit";
+    public static final String SEMI_COLON = ";";
+
+
+    //Foreign Key Constraint
+    public static final String REFERENCES = "REFERENCES";
+    public static final String CONSTRAINT = "CONSTRAINT";
+    public static final String FOREIGN_KEY = "FOREIGN KEY";
+    public static final String FK_PREFIX = "fk";
+    public static final String UNDERSCORE = "_";
+
+
+    public static String constructColumn(String columnName, String dataType){
+        return SPACE + SPACE + SPACE + columnName + SPACE + dataType;
+    }
+}