Question

我在Groovy的一次激活中运行多个SQL语句时遇到问题。

sql = Sql.newInstance("jdbc:mysql://localhost/", "usre", "pass", "com.mysql.jdbc.Driver")
sql.execute("USE foo; "); // this works
sql.execute("USE foo; USE foo;"); // this fails miserably

我得到的错误是“你的SQL语法有错误”。是什么给了什么？

Answer 1

您可以简单地将以下jdbc url参数扩充到您的连接字符串

http://dev.mysql.com/doc/refman/5.0/en/connector-j-reference-configuration-properties.html#allowMultiQueries

来自文档：

允许使用';'划界一个语句中的多个查询（true / false），默认为'false'

例如：

Sql.newInstance("jdbc:mysql://localhost?allowMultiQueries=true", "usre", "pass", "com.mysql.jdbc.Driver")

Answer 2

问题是因为groovy使用JDBC的Statement.execute（），它需要on语句。这是Groovy的Sql的替换类，可以解决这个问题（但缺少功能）

/**
 * Not related to mysql, just to distinguish it from Groovy's Sql class
 * Created to solve this problem: http://stackoverflow.com/questions/4286483/running-multiple-sql-statements-from-groovy
 */
public class MySql {
  private final String password;
  private final String connectionString;
  private final String user;

  public static newInstance(String connectionString, String user, String password, String driverName) {
    Class.forName(driverName).newInstance();
    return new MySql(connectionString, user, password);
  }

  public MySql(String connectionString, String user, String password) {
    this.connectionString = connectionString;
    this.user = user;
    this.password = password;
  }

  void execute(String query) {
    Connection conn = DriverManager.getConnection(connectionString, user, password);
    try {
      Statement statement = conn.createStatement();
      for (String subQuery : query.split(";"))
      {
        if (subQuery.trim() == '')
          continue;

        statement.addBatch subQuery
      }
      statement.executeBatch();
    }
    finally {
      conn.close();
    }
  }
}

Answer 3

Groovy开发人员之一的Paul King评论了我打开的问题，你可以告诉mysql允许多个语句（其他RDBMS不一定支持）

从Groovy运行多个SQL语句

3 个答案: