[英]How can I create a PostgreSQL database in Java?
我创建了一组修改数据库的 SQL 查询,现在我想测试它们。
如何创建本地和临时 PostgreSQL 数据库来测试我的查询。 我在 Java 工作。
您可以使用 Statement 对象通过 Java 创建和删除 PostgreSQL 数据库。
例子:
Connection c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/", "username", "password");
Statement statement = c.createStatement();
statement.executeUpdate("DROP DATABASE mydb");
请参阅以下链接以获得良好的起点:
http://www.jvmhost.com/articles/create-drop-databases-dynamically-java-jsp-code
你可以看看她如何创建数据库 希望这有助于
http://www.tutorialspoint.com/jdbc/jdbc-create-database.htm
您必须先连接到本地主机
//STEP 1. Import required packages
import java.sql.*;
public class JDBCExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/";
// Database credentials
static final String USER = "username";
static final String PASS = "password";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
//STEP 4: Execute a query
System.out.println("Creating database...");
stmt = conn.createStatement();
String sql = "CREATE DATABASE STUDENTS";
stmt.executeUpdate(sql);
System.out.println("Database created successfully...");
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
stmt.close();
}catch(SQLException se2){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
}//end JDBCExample
您的问题有点错误,使用 Java 代码无法创建数据库,您只能连接到数据库。
首先,您需要在 PgAdminIII 中创建一个数据库。
这是帮助您通过 JAVA 在 postgresql 数据库中创建表的代码
package database;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Database {
public static void main(String args[]) {
try {
Connection c = null;
Statement stmt = null;
try {
Class.forName("org.postgresql.Driver");
c = DriverManager.getConnection("jdbc:postgresql://localhost:5432/kanwar","postgres", "osm");
} catch (Exception e) {
e.printStackTrace();
System.err.println(e.getClass().getName()+": "+e.getMessage());
System.exit(0);
}
System.out.println("Opened database successfully");
try {
stmt = c.createStatement();
} catch (SQLException ex) {
Logger.getLogger(Database.class.getName()).log(Level.SEVERE, null, ex);
}
String sql = "CREATE TABLE MY_TABLE "+
"(ID INT NOT NULL,"
+ "NAME TEXT NOT NULL,"
+ "AGE INT NOT NULL)";
stmt.executeUpdate(sql);
stmt.close();
c.close();
} catch (SQLException ex) {
Logger.getLogger(Database.class.getName()).log(Level.SEVERE, null, ex);
}
catch(Exception e)
{
System.err.println( e.getClass().getName()+": "+ e.getMessage() );
System.exit(0);
}
System.out.println("Table Created Successfully");
}
}
完整参考: http : //kodingpoint.blogspot.in/2014/01/java-postgresql-connectivity-example.html
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