JDBC – How to print all table names from a database?

A JDBC example to connect to a PostgreSQL, and print out all the tables from the default database postgres

pom.xml

	<dependencies>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.2.5</version>
        </dependency>
    </dependencies>

P.S Tested with Java 8 and postgresql jdbc driver 42.2.5

PrintAllTables.java

package com.mkyong.jdbc;

import java.sql.*;

public class PrintAllTables {

    public static void main(String[] argv) {

        System.out.println("PostgreSQL JDBC Connection Testing ~");

        try {

            Class.forName("org.postgresql.Driver");

        } catch (ClassNotFoundException e) {
            System.err.println("Unable to find the PostgreSQL JDBC Driver!");
            e.printStackTrace();
            return;
        }

        // default database: postgres
        // JDK 7, auto close connection with try-with-resources
        try (Connection connection =
                     DriverManager.getConnection("jdbc:postgresql://127.0.0.1:5432/postgres",
                             "postgres", "password")) {


            DatabaseMetaData metaData = connection.getMetaData();

            try (ResultSet rs = metaData.getTables(null, null, "%", null)) {

                ResultSetMetaData rsMeta = rs.getMetaData();
                int columnCount = rsMeta.getColumnCount();

                while (rs.next()) {

                    System.out.println("\n----------");
                    System.out.println(rs.getString("TABLE_NAME"));
                    System.out.println("----------");

                    for (int i = 1; i <= columnCount; i++) {
                        String columnName = rsMeta.getColumnName(i);
                        System.out.format("%s:%s\n", columnName, rs.getString(i));
                    }

                }
            }

        } catch (SQLException e) {
            System.err.println("Something went wrong!");
            e.printStackTrace();
            return;
        }

    }

}

Output


----------
pg_aggregate_fnoid_index
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_aggregate_fnoid_index
table_type:SYSTEM INDEX
remarks:null

----------
pg_am_name_index
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_am_name_index
table_type:SYSTEM INDEX
remarks:null

----------
pg_am_oid_index
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_am_oid_index
table_type:SYSTEM INDEX
remarks:null

----------
pg_amop_fam_strat_index
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_amop_fam_strat_index
table_type:SYSTEM INDEX
remarks:null

----------
pg_amop_oid_index
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_amop_oid_index
table_type:SYSTEM INDEX
remarks:null

----------
pg_amop_opr_fam_index
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_amop_opr_fam_index
table_type:SYSTEM INDEX
remarks:null

//...

----------
pg_stat_progress_vacuum
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_stat_progress_vacuum
table_type:SYSTEM VIEW
remarks:null

----------
pg_stat_replication
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_stat_replication
table_type:SYSTEM VIEW
remarks:null

----------
pg_stat_ssl
----------
table_cat:null
table_schem:pg_catalog
table_name:pg_stat_ssl
table_type:SYSTEM VIEW
remarks:null

//...

References

About the Author

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mkyong
Founder of Mkyong.com, love Java and open source stuff. Follow him on Twitter. If you like my tutorials, consider make a donation to these charities.

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Reny

tks!