Oracle Database Freeの利用を開始する

OracleDataSource ods = new OracleDataSource();
ods.setURL("jdbc:oracle:thin:@localhost:1521/FREEPDB1"); // jdbc:oracle:thin@[hostname]:[port]/[DB service name]
ods.setUser("[Username]");
ods.setPassword("[Password]");
Connection conn = ods.getConnection();
 
PreparedStatement stmt = conn.prepareStatement("SELECT 'Hello World!' FROM dual");
ResultSet rslt = stmt.executeQuery();
while (rslt.next()) {
  System.out.println(rslt.getString(1));
}
	

import oracledb

conn = oracledb.connect(user="[Username]", password="[Password]", dsn="localhost:1521/FREEPDB1")
with conn.cursor() as cur:
   cur.execute("SELECT 'Hello World!' FROM dual")
   res = cur.fetchall()
   print(res)
	

const oracledb = require('oracledb');
     
async function run() {
    let connection = await oracledb.getConnection({
    user : "[Username]",
    password : "[Password]",
    connectString : "localhost:1521/FREEPDB1" // [hostname]:[port]/[DB service name]
    });
    let result = await connection.execute( "SELECT 'Hello World!' FROM dual");
    console.log(result.rows[0]);
}
     
run();
	

					
	// Connection string format: User Id=[username];Password=[password];Data Source=[hostname]:[port]/[DB service name];
    OracleConnection con = new OracleConnection("User Id=[Username];Password=[Password];Data Source=localhost:1521/FREEPDB1;");
    con.Open();
    OracleCommand cmd = con.CreateCommand();
    cmd.CommandText = "SELECT \'Hello World!\' FROM dual";
     
    OracleDataReader reader = cmd.ExecuteReader();
    reader.Read();
    Console.WriteLine(reader.GetString(0));
	

// [username], [password], [hostname]:[port]/[DB service name]
$c = oci_pconnect("[Username]", "[Password]", "localhost:1521/FREEPDB1");
$s = oci_parse($c, "SELECT 'Hello World!' FROM dual");
oci_execute($s);
oci_fetch_all($s, $res);
echo "<pre>\n"
var_dump($res);
echo "</pre>\n";
	

require 'oci8'
     
con = OCI8.new("[Username]", "[Password]", "localhost:1521/FREEPDB1")
statement = "SELECT 'Hello World!' FROM dual"
cursor = con.parse(statement)
cursor.exec
cursor.fetch do |row|
print row
end
	

package main
     
import (
      "fmt"
      "log"
      "database/sql"
      _ "github.com/godror/godror"
)
     
func main() {  
     
      // connectString format: [hostname]:[port]/[DB service name]
     
      dsn := `user="[Username]"
              password="[Password]"
              connectString="localhost:1521/FREEPDB1"`  
     
      db, err := sql.Open("godror", dsn)
      if err != nil {
        panic(err)
      }
      defer db.Close()
     
      rows, err := db.Query("SELECT 'Hello World!' FROM dual")
      if err != nil {
        panic(err)
      }
      defer rows.Close()
     
      var strVal string
      for rows.Next() {
        err := rows.Scan(&strVal)
        if err != nil {
          log.Fatal(err)
        }
        fmt.Println(strVal)
      }
      err = rows.Err()
      if err != nil {
        log.Fatal(err)
      }
     
}