JSqlParser के साथ क्रिएट टेबल स्टेटमेंट में प्राथमिक कुंजी जोड़ना

JSqlParser

टेबल स्टेटमेंट बनाएं

CREATE TABLE College_db.Students (
 Student_id int,
 Name varchar(255),
 Course varchar(255),
 Join_date DATE
);

JSqlParser का उपयोग करके क्रिएट टेबल SQL को पार्स करने के लिए जावा प्रोग्राम

चरण 1:JSqlParser को निर्भरता के रूप में जोड़ना

<dependency>
 <groupId>com.github.jsqlparser</groupId>
 <artifactId>jsqlparser</artifactId>
 <version>4.2</version>
</dependency>

चरण 2:इनपुट क्रिएट टेबल स्टेटमेंट को एक वेरिएबल में असाइन करें

String createTableSql = "CREATE TABLE College_db.Students (\n" +
 " Student_id int,\n" +
 " Name varchar(255),\n" +
 " Course varchar(255),\n" +
 " Join_date DATE\n" +
 ");";

चरण 3:JSqlParser का उपयोग करके SQL को पार्स करें

Statement createTable = CCJSqlParserUtil.parse(createTableSql);

चरण 4 :पार्सर आउटपुट का अन्वेषण करें

System.out.println("Table Name from query: " + ((CreateTable) createTable).getTable().getName());
System.out.println("Database Name from query: " + ((CreateTable) createTable).getTable().getSchemaName());
System.out.println("\nColumns in the given insert query");
System.out.println("---------------------------------\n");
for(ColumnDefinition col: ((CreateTable) createTable).getColumnDefinitions())
{
 System.out.println(col.getColumnName() + " - " + col.getColDataType().toString());
}
//Changing the DB and table name
((CreateTable) createTable).getTable().setSchemaName("College_db_bk");
((CreateTable) createTable).getTable().setName("Students_bkup");

चरण 5:सूचकांक के रूप में प्राथमिक कुंजी बाधा बनाएँ

//Creating Primary Key constraint
NamedConstraint namedConstraint = new NamedConstraint();
namedConstraint.setType("PRIMARY KEY");
//Adding column names for the Primary Key
List<Index.ColumnParams> columns = new ArrayList<>();
Index.ColumnParams columnParams = new Index.ColumnParams("Student_id");
columns.add(columnParams);
//Setting columns in the Primary Key constraint
namedConstraint.setColumns(columns);

//Setting the Primary Key constraint in Index list
List<Index> indexList = new ArrayList<>();
indexList.add(namedConstraint);

चरण 6:CREATE TABLE स्टेटमेंट में इंडेक्स सेट करें

((CreateTable) createTable).setIndexes(indexList);

क्रिएट टेबल SQL में प्राथमिक कुंजी जोड़ने के लिए जावा प्रोग्राम को पूरा करें

import net.sf.jsqlparser.JSQLParserException;
import net.sf.jsqlparser.parser.CCJSqlParserUtil;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.create.table.ColumnDefinition;
import net.sf.jsqlparser.statement.create.table.CreateTable;
import net.sf.jsqlparser.statement.create.table.Index;
import net.sf.jsqlparser.statement.create.table.NamedConstraint;
import java.util.ArrayList;
import java.util.List;
public class AddPrimaryKey {
 public static void main(String[] args) {
 System.out.println("Adding Primary key in the CREATE TABLE statement");
 System.out.println("-------------------------------------\n");
 //Assign the input CREATE TABLE sql
 String createTableSql = "CREATE TABLE College_db.Students (\n" +
 " Student_id int,\n" +
 " Name varchar(255),\n" +
 " Course varchar(255),\n" +
 " Join_date DATE\n" +
 ");";
 try {
 //Parsing Create table statement using JSqlParser
 Statement createTable = CCJSqlParserUtil.parse(createTableSql);
 //Getting the table and database name from Create table
 System.out.println("Table Name from query: " + ((CreateTable) createTable).getTable().getName());
 System.out.println("Database Name from query: " + ((CreateTable) createTable).getTable().getSchemaName());
 System.out.println("\nColumns in the given insert query");
 System.out.println("---------------------------------\n");
 for (ColumnDefinition col : ((CreateTable) createTable).getColumnDefinitions()) {
 System.out.println(col.getColumnName() + " - " + col.getColDataType().toString());
 }
 //Changing the DB and table name
 ((CreateTable) createTable).getTable().setSchemaName("College_db_bk");
 ((CreateTable) createTable).getTable().setName("Students_bkup");
 //Creating Primary Key constraint
 NamedConstraint namedConstraint = new NamedConstraint();
 namedConstraint.setType("PRIMARY KEY");
 //Adding column names for the Primary Key
 List<Index.ColumnParams> columns = new ArrayList<>();
 Index.ColumnParams columnParams = new Index.ColumnParams("Student_id");
 columns.add(columnParams);
 //Setting columns in the Primary Key constraint
 namedConstraint.setColumns(columns);
 //Setting the Primary Key constraint in Index list
 List<Index> indexList = new ArrayList<>();
 indexList.add(namedConstraint);
 //Setting the indexes in Create table statement
 ((CreateTable) createTable).setIndexes(indexList);
 System.out.println("New CREATE TABLE statement with Primary Key");
 System.out.println("---------------------------------");
 System.out.println(createTable + ";");
 } catch (JSQLParserException e) {
 throw new RuntimeException(e);
 }
 }
}

Adding Primary key in the CREATE TABLE statement
-------------------------------------
Table Name from query: Students
Database Name from query: College_db
Columns in the given insert query
---------------------------------
Student_id - int
Name - varchar (255)
Course - varchar (255)
Join_date - DATE
New CREATE TABLE statement with Primary Key
---------------------------------
CREATE TABLE College_db_bk.Students_bkup (Student_id int, 
Name varchar (255), 
Course varchar (255), 
Join_date DATE, 
PRIMARY KEY (Student_id));

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