version of the MySQL server. package zetcode; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import String user = "testuser"; String password = "test623"; try { con = DriverManager.getConnection(url, user, password); st = con.createStatement(); rs = different syntax for the url. In our case, we provide a host, a port and a database name. con = DriverManager.getConnection(url, user, password); We establish a connection to the database, using the connection

⽰例程序1，java连接UDW，执⾏建表，插⼊操作 PostgreSQLJDBC1.java import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; public class PostgreSQLJDBC1 { public static void main(String args[]) Connection c = null; Statement stmt = null; try { Class.forName("org.postgresql.Driver"); c = DriverManager.getConnection("jdbc:postgresql://hostIP:port/dbname",”UserName”,”Password”); stmt = c.createStatement(); } ⽰例程序⼆：java连接UDW，执⾏查询操作 PostgreSQLJDBC2.java import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class PostgreSQLJDBC2 { public

JDBC规定了一整套访问数据库的标准API，所有数据库都 需要实现它，因此，使用JDBC访问数据库的Java应用程 序，是很容易切换底层数据库的。 JDBC核心类型一览表 核心类型（java.sql） 说明 DriverManager 负责装载/卸载驱动程序 Connection 与数据库建立连接 Statement 在一个给定的连接中执行SQL语句 PreparedStatement 用于执行预编译的SQL命令 创建一个包容程序入口点的Main类， 准备编写数据库连接代码。 连接数据库 Connection connection = DriverManager.getConnection("jdbc:sqlite:./dbs/test.db"); DriverManager类代表驱动程序管理器，提供了几个静态方法负责装载驱动 程序和得到对特定数据库的连接，其中getConnection方法用于连接数据库。 多知道一点：早期的数据库驱动加载代码 Class.forName("com.mysql.jdbc.Driver"); 早期的JDBC代码，使用以下这句加载特定数据库的数据驱动： JDBC 4.0以后版本的DriverManager，它的getConnection 方法进行了增强，只需要传给它数据库连接字符串，它就可以 自动进行推断并加载相应的数据库驱动程序。

ult;"; public static void main(String[] args) throws SQLException { try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet format(kyuubiJdbcUrlTemplate, clientPrincipal,␣ ˓→clientKeytab, serverPrincipal); try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet to use the java.sql.DriverManager class to establish a connection for JDBC: private static Connection newKyuubiConnection() throws Exception { Connection connection = DriverManager.getConnection(CONNECTION_URL);

ult;"; public static void main(String[] args) throws SQLException { try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet format(kyuubiJdbcUrl, clientPrincipal, clientKeytab,␣ ˓→serverPrincipal); try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet to use the java.sql.DriverManager class to establish a connection for JDBC: private static Connection newKyuubiConnection() throws Exception { Connection connection = DriverManager.getConnection(CONNECTION_URL);

ult;"; public static void main(String[] args) throws SQLException { try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet format(kyuubiJdbcUrlTemplate, clientPrincipal,␣ ˓→clientKeytab, serverPrincipal); try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet to use the java.sql.DriverManager class to establish a connection for JDBC: private static Connection newKyuubiConnection() throws Exception { Connection connection = DriverManager.getConnection(CONNECTION_URL);

ult;"; public static void main(String[] args) throws SQLException { try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet format(kyuubiJdbcUrlTemplate, clientPrincipal,␣ ˓→clientKeytab, serverPrincipal); try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet to use the java.sql.DriverManager class to establish a connection for JDBC: private static Connection newKyuubiConnection() throws Exception { Connection connection = DriverManager.getConnection(CONNECTION_URL);

ult;"; public static void main(String[] args) throws SQLException { try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet format(kyuubiJdbcUrlTemplate, clientPrincipal,␣ ˓→clientKeytab, serverPrincipal); try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet to use the java.sql.DriverManager class to establish a connection for JDBC: private static Connection newKyuubiConnection() throws Exception { Connection connection = DriverManager.getConnection(CONNECTION_URL);

{ Connection c = null; try { Class.forName("org.sqlite.JDBC"); c = DriverManager.getConnection("jdbc:sqlite:test.db"); } catch ( Exception e ) { System.err.println( null; Statement stmt = null; try { Class.forName("org.sqlite.JDBC"); c = DriverManager.getConnection("jdbc:sqlite:test.db"); System.out.println("Opened database successfully"); null; Statement stmt = null; try { Class.forName("org.sqlite.JDBC"); c = DriverManager.getConnection("jdbc:sqlite:test.db"); c.setAutoCommit(false); System.out.println("Opened

ult;"; public static void main(String[] args) throws SQLException { try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet format(kyuubiJdbcUrlTemplate, clientPrincipal,␣ ˓→clientKeytab, serverPrincipal); try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) { try (Statement stmt = conn.createStatement()) { try (ResultSet to use the java.sql.DriverManager class to establish a connection for JDBC: private static Connection newKyuubiConnection() throws Exception { Connection connection = DriverManager.getConnection(CONNECTION_URL);