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Are nested transactions allowed in MySQL?
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InnoDB supports SAVEPOINTS.
You can do the following:
CREATE TABLE t_test (id INT NOT NULL PRIMARY KEY) ENGINE=InnoDB;
START TRANSACTION;
INSERT
INTO t_test
VALUES (1);
SELECT *
FROM t_test;
id
---
1
SAVEPOINT tran2;
INSERT
INTO...
Iterating over all the keys of a map
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https://play.golang.org/p/JGZ7mN0-U-
for k, v := range m {
fmt.Printf("key[%s] value[%s]\n", k, v)
}
or
for k := range m {
fmt.Printf("key[%s] value[%s]\n", k, m[k])
}
Go language specs for for statements specifies that the first value is the key, the second variable is the value,...
get string value from UISegmentedControl
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[segmentedControl titleForSegmentAtIndex:int];
For the current selected index
[segmentedControl titleForSegmentAtIndex:[segmentedControl selectedSegmentIndex]];
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python ? (conditional/ternary) operator for assignments [duplicate]
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@karadoc right point but bad example&no explanation for the second example: for beginners: if "something" is considered empty/falsy => it is evaluated to False => so you will NEVER get values like 0 (int zero), ""(empty string), [] ...
How to remove not null constraint in sql server using query
I am trying to remove not null constraint in sql server 2008 without losing data.
4 Answers
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What do column flags mean in MySQL Workbench?
...UQ - Create/remove Unique Key
ZF - Zero-Filled (if the length is 5 like INT(5) then every field is filled with 0’s to the 5th digit. 12 = 00012, 400 = 00400, etc. )
AI - Auto Increment
G - Generated column. i.e. value generated by a formula based on the other columns
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HttpServletRequest get JSON POST data [duplicate]
... request string");
}
// Work with the data using methods like...
// int someInt = jsonObject.getInt("intParamName");
// String someString = jsonObject.getString("stringParamName");
// JSONObject nestedObj = jsonObject.getJSONObject("nestedObjName");
// JSONArray arr = jsonObject.getJSON...
How can I change the image of an ImageView? [duplicate]
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if (android.os.Build.VERSION.SDK_INT >= 21) {
storeViewHolder.storeNameTextView.setImageDrawable(context.getResources().getDrawable(array[position], context.getTheme()));
} else {
storeViewHolder.storeNameTextView.setImageDrawable(...
How to clear ostringstream [duplicate]
... +1 for creating a fresh stream each time. Streams can have lots of internal state. Resetting all of that takes at least as much code as the stream constructor.
– Bo Persson
Mar 13 '11 at 7:47
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Reading and writing environment variables in Python? [duplicate]
...d processes via os.system(), popen() or fork() and execv()
someVariable = int(os.environ['DEBUSSY'])
See the Python docs on os.environ. Also, for spawning child processes, see Python's subprocess docs.
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