fixed pg connection

data/2.Java中阶/2.使用JDBC操作数据库/2.数据库操作/PSQLConnection.md

 # PSQL Connection
 
 
-以下连接postgre数据正确的是：
+以下程序中，正确连接postgre数据库的是：
 
 
 ## 答案
@@ -17,7 +17,7 @@ public class PSQLConnection {
         Connection conn = null;
         try {
             Class.forName("org.postgresql.Driver");
-            conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/test", "root", "root");
+            conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/test");
             Statement stmt = conn.createStatement();
 
             String sql = "CREATE TABLE student " +
@@ -54,7 +54,7 @@ public class PSQLConnection {
         Connection conn = null;
         try {
             Class.forName("org.postgresql.Driver");
-            conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/test");
+            conn = new Connection("jdbc:postgresql://dev-cloud.csdn.net:5432/test");
             Statement stmt = conn.createStatement();
 
             String sql = "CREATE TABLE student " +
@@ -89,7 +89,7 @@ public class PSQLConnection {
         Connection conn = null;
         try {
             Class.forName("org.postgresql.Driver");
-            conn = DriverManager.getConnection("jdbc:postgresql://root:root@localhost:5432/test");
+            conn = DriverManager.getConnection("jdbc:postgresql://root+root@localhost:5432/test");
             Statement stmt = conn.createStatement();
 
             String sql = "CREATE TABLE student " +
@@ -124,7 +124,7 @@ public class PSQLConnection {
         Connection conn = null;
         try {
             Class.forName("org.postgresql.Driver");
-            conn = DriverManager.getConnection("jdbc:postgresql://localhost/test", "root", "root");
+            conn = new Connection("jdbc:postgresql://localhost/test", "root", "root");
             Statement stmt = conn.createStatement();
 
             String sql = "CREATE TABLE student " +