CREATE DATABASE query using java jdbc and prepared statement returns 语法错误

Question

我试图让 Java 使用 JDBC 创建数据库，但我收到语法错误，尽管查询是正确的。例如，如果我将数据库的名称显式写入代码，它就可以正常工作。这是我的代码：

package mysql_manipulator;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class Create {
    private static final String 
            driver = "com.mysql.jdbc.Driver",
            url = "jdbc:mysql://localhost",
            username = "dylan",
            password = "******";
    private String databaseName;

    public Create (){
        this.databaseName = null;
    }

    public String getDatabaseName() {
        return databaseName;
    }

    public void setDatabaseName(String databaseName) {
        this.databaseName = databaseName;
    }

    public void createDatabase(String databaseName){
        try {
            this.setDatabaseName(databaseName);        
            Class.forName(driver);
            Connection con = DriverManager.getConnection(url,username, 
                password);
            String query = "CREATE DATABASE ?";
            PreparedStatement preparedStmt = con.prepareStatement(query);
            preparedStmt.setString (1,this.getDatabaseName());
            preparedStmt.execute();
            preparedStmt.close();
            con.close();        
        }
        catch (Exception anException){
            System.out.println("Error: " + anException);
        }
    }
}

我的主Class

package mysql_manipulator;

public class Mysql_manipulator {
    public static void main(String[] args) {
        Create myObj = new Create();
        myObj.createDatabase("whatevs");        
    }    
}

错误

Error: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You  have an error in
your SQL syntax; check the manual that corresponds to your  MariaDB server version 
for the right syntax to use near ''whatevs'' at line 1

非常感谢任何知道为什么这不起作用的人 - 我在整个网络上搜索都无济于事。

Answer 1

您不能将数据库名称作为绑定变量——您必须将其嵌入到查询文字中。将您的查询改为：

String query = "CREATE DATABASE " + getDatabaseName();

对于运行这个 SQL.

，您也可以使用普通的 Statement（而不是 PreparedStatement）

Answer 2

Conn = DriverManager.getConnection 
("jdbc:mysql://localhost/?user=root&password=rootpassword"); 
Statement s=Conn.createStatement(); 

int Result=s.executeUpdate("CREATE DATABASE databasename");

见

http://forums.mysql.com/read.php?39,99321,102211#msg-102211

Create MySQL database from Java

CREATE DATABASE query using java jdbc and prepared statement returns 语法错误

CREATE DATABASE query using java jdbc and prepared statement returns syntax error

java

mysql

jdbc

prepared-statement