使用JDBC获取MySQL查询的状态消息（包括执行时间）

Question

Suppose that I am implementing a query in MySQL say

Create Database newdb;

then the database responds the result

database created in 0.05 sec

Now my question is how to get this message in a Java program using JDBC?

Answer 1

The following code works for me

try (Statement s = conn.createStatement()) {
    s.execute("SET PROFILING=1;");
    s.execute("CREATE DATABASE newdb;");
    try (ResultSet rs = s.executeQuery("SHOW PROFILES;")) {
        rs.next();
        System.out.printf(
                "     Statement: %s%nExecution time: %f seconds.%n", 
                rs.getString("Query"), 
                rs.getDouble("Duration"));
    }
    s.execute("SET PROFILING=0;");
}

The console output is

     Statement: CREATE DATABASE newdb
Execution time: 0.002014 seconds.

Answer 2

No you cannot do that. Not at least with JDBC. All you can do is -

Class.forName(jdbcDriver);
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/?user=root&password=");
Statement statement = connection .createStatement();
int result = statement.executeUpdate("CREATE DATABASE IF NOT EXISTS" + dbName)

and you will get result as 0.

Note that when the return value for executeUpdate is 0, it can mean one of two things:

• The statement executed was an update statement that affected zero rows.

• The statement executed was a DDL statement.

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