java - 尝试切换到(使用)数据库时出现 JDBC "Error in MySQL Syntax"

Question

我一直在尝试使用这段代码在数据库中创建一个表，在此之前的代码已成功创建。

//Creates "Parts" Table if it's not already created.
public void createTableIfNecessary() throws SQLException{
String createString =
        "USE inventory; " +
        "CREATE TABLE IF NOT EXISTS parts " +
                "(part_name TEXT NOT NULL, remaining_amt INT NOT NULL, " +
                "restock_amt INT, barcode TEXT, location TEXT, part_id INT NOT NULL AUTO_INCREMENT);";
Statement createTable = this.con.createStatement();
createTable.execute(createString);
System.out.println("Table created or already existed: Parts");
}

我连接到数据库服务器的代码:

    try{Class.forName("com.mysql.jdbc.Driver");} catch(Exception e){
        e.printStackTrace();
    }
    this.con = null;
    Properties connectionProps = new Properties();
    connectionProps.put("user", this.userName);
    connectionProps.put("password", this.password);
    this.con = DriverManager.getConnection("jdbc:mysql://" + this.serverName + ":" + this.portNumber + "/", connectionProps);
    System.out.println("Connected to MySQL Database Server");

(这行得通，但看看可能会有帮助)

我的错误:

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CREATE TABLE IF NOT EXISTS parts (part_name TEXT NOT NULL, remaining_amt INT NOT' at line 1

我假设这只是我对 MySQL 的无能，但也许这里有人可以看到我的语法错误。谢谢!

Answer 1

USE inventory; 语句不适用于 JDBC 连接上下文。您需要使用 Connection#setCatalog()切换到特定的数据库。更多详细信息，请参阅

Java, how to change current database to another?

这样做并从您的 SQL 中删除 USE 子句。