我的应用程序从远程URL获取数据，并将数据插入db。每2分钟执行大约200次远程获取，每次获取将返回大约100行数据。我已经使用基本的jdbc连接到数据库。
我对Java和数据库还很陌生。请针对上述情况为我指导有关数据库连接的正确方向。
我当前的Java代码是here。
package sample.lib;
import javafx.collections.ObservableList;
import java.sql.*;
public class db_pg {
public static final String DB = "oidata_pg";
public static final String URL = "jdbc:postgresql://localhost:5432/"+DB;
public static final String USER = "stockdeveloper";
public static final String PASS = "123456";
/*############################################################
DB CREATION LOGIC
############################################################*/
public void createDB(String dbname) throws SQLException{
Connection c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres", "stockdeveloper", "555555");
Statement statement = c.createStatement();
ResultSet rs = statement.executeQuery("SELECT datname FROM pg_catalog.pg_database WHERE datname = '"+dbname+"';");
if(!rs.next())
{
statement.executeUpdate("CREATE DATABASE "+dbname);
}
}
/*############################################################
DB DROP LOGIC
############################################################*/
public void deleteDB() throws SQLException {
String sql = "DROP TABLE IF EXISTS OptionData";
try(Connection conn = this.connect();
PreparedStatement pstmt = conn.prepareStatement(sql))
{
pstmt.executeUpdate();
}
catch (SQLException e)
{
System.out.println(e.getMessage());
}
}
/*############################################################
DB CONNECTION LOGIC
############################################################*/
public static Connection getConnection(){
try{
return DriverManager.getConnection(URL, USER, PASS);
} catch (SQLException ex) {
throw new RuntimeException("Error connecting to the database", ex);
}
}
/*############################################################
TABLE CREATION LOGIC
############################################################*/
//Table for FnO Master List
public void createPGTableFnoMaster() throws SQLException {
String sql = "CREATE TABLE IF NOT EXISTS FnoMaster ("
+ " id BIGSERIAL PRIMARY KEY,"
+ " symcode TEXT NOT NULL,\n"
+ " sym1 TEXT NOT NULL,\n"
+ " sym2 TEXT NOT NULL,\n"
+ " inst TEXT NOT NULL,\n"
+ " fullname TEXT NOT NULL,\n"
+ " status TEXT NOT NULL,\n"
+ " optionType CHAR(2) NOT NULL,"
+ " strikePrice REAL NOT NULL,\n"
+ " expiryDate DATE NOT NULL,\n"
+ " lotsize INT NOT NULL,\n"
+ "underlying REAL NOT NULL\n"
+ ");";
try(Connection conn = getConnection();
Statement stmt = conn.createStatement())
{
stmt.execute(sql);
}
catch (SQLException e)
{
System.out.println(e.getMessage());
}
}
//Table for FnO Data Fetch Log
public void createPGTableFnoLog() throws SQLException {
String sql = "CREATE TABLE IF NOT EXISTS FnoLog(\n"
+ " id BIGSERIAL PRIMARY KEY,\n"
+ " lastAttempted TIMESTAMP NOT NULL,\n"
+ " lastUpdated TIMESTAMP NOT NULL\n"
+ ");";
try(Connection conn = getConnection();
Statement stmt = conn.createStatement())
{
stmt.execute(sql);
}
catch (SQLException e)
{
System.out.println(e.getMessage());
}
}
//Table for FnO Data
public void createPGTableOptionData() throws SQLException {
String sql = "CREATE TABLE IF NOT EXISTS OptionData ("
+ " id BIGSERIAL PRIMARY KEY,"
+ " optionType CHAR(2) NOT NULL,"
+ " strikePrice REAL NOT NULL,\n"
+ " expiryDate DATE NOT NULL,\n"
+ " OI BIGINT NOT NULL,\n"
+ " OIChng BIGINT NOT NULL,\n"
+ " vol BIGINT NOT NULL,\n"
+ " IV REAL NOT NULL,\n"
+ " LTP REAL NOT NULL,\n"
+ " netChng REAL NOT NULL,\n"
+ " bidQty INTEGER NOT NULL,\n"
+ " bidPrice REAL NOT NULL,\n"
+ " ofrQty INTEGER NOT NULL,\n"
+ "ofrPrice REAL NOT NULL,\n"
+ " lastUpdate TIMESTAMP NOT NULL,\n"
+ "underlying REAL NOT NULL\n"
+ ");";
try(Connection conn = getConnection();
Statement stmt = conn.createStatement())
{
stmt.execute(sql);
}
catch (SQLException e)
{
System.out.println(e.getMessage());
}
}
/*############################################################
DATA INSERTION LOGIC
############################################################*/
public void insertToFnoList(ObservableList<fnoList> data) throws SQLException {
try{
Connection conn = getConnection();
String sql ="INSERT INTO FnoList(symcode,sym1,sym2,inst) VALUES(?,?,?,?);";
conn.setAutoCommit(false);
PreparedStatement pstmt = conn.prepareStatement(sql);
int i = 0;
for (fnoList dat : data) {
pstmt.setString(1, dat.getSymcode());
pstmt.setString(2, dat.getSym1());
pstmt.setString(3, dat.getSym2());
pstmt.setString(4, dat.getInst());
pstmt.addBatch();
i++;
if (i % 1000 == 0) {
pstmt.executeBatch(); // Execute every 200 items.
}
}
pstmt.executeBatch();
conn.commit();
pstmt.close();
}
catch(Exception e){
//if(co)
}
}
public void insertToOptionData(ObservableList<OptionData> data) throws SQLException {
String sql = "INSERT INTO OptionData(optionType,strikePrice,expiryDate,OI,OIChng,vol,IV,LTP,netChng,bidQty,bidPrice,ofrQty,ofrPrice, lastUpdate, underlying) VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
Connection conn = getConnection();
conn.setAutoCommit(false);
//conn.setTransactionIsolation();
//SQLiteDatabase database = this.getWritableDatabase();
PreparedStatement pstmt = conn.prepareStatement(sql);
int i = 0;
for (OptionData dat : data) {
pstmt.setString(1, dat.getOptionType());
pstmt.setFloat(2, Converter.toFloat(dat.getStrikePrice()));
pstmt.setString(3, dat.getExpiryDate());
pstmt.setInt(4, Converter.toInt(dat.getOI()));
pstmt.setInt(5, Converter.toInt(dat.getOIChng()));
pstmt.setLong(6, Converter.toLong(dat.getVol()));
pstmt.setFloat(7, Converter.toFloat(dat.getIV()));
pstmt.setFloat(8, Converter.toFloat(dat.getLTP()));
pstmt.setFloat(9, Converter.toFloat(dat.getNetChng()));
pstmt.setInt(10, Converter.toInt(dat.getBidQty()));
pstmt.setFloat(11, Converter.toFloat(dat.getBidPrice()));
pstmt.setInt(12, Converter.toInt(dat.getOfrQty()));
pstmt.setFloat(13, Converter.toFloat(dat.getOfrPrice()));
pstmt.setString(14, dat.getLastUpdate());
pstmt.setFloat(15, Converter.toFloat(dat.getUnderlying()));
pstmt.addBatch();
i++;
if (i % 1000 == 0) {
pstmt.executeBatch(); // Execute every 200 items.
}
}
pstmt.executeBatch();
conn.commit();
pstmt.close();
}
/*############################################################
TEST RUN THIS CLASS ALONE
############################################################*/
public void initialize() throws SQLException {
this.connect();
//this.createTableOptionData();
//this.createTableFnoList();
}
public void initializePG() throws SQLException{
db_pg database = new db_pg();
//database.connect();
//database.deleteDB();
//database.initialize();
database.createDB(DB);
database.createPGTableOptionData();
database.createPGTableFnoMaster();
}
public static void main(String[] args) throws SQLException {
db_pg database = new db_pg();
//database.connect();
//database.deleteDB();
//database.initialize();
//database.createDB(DB);
database.initializePG();
}