Oracle AI Database Free 入门

 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) } }