- Sql Database Query Tool
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The USE Statement is used to select a database and perform SQL operations into that database. The database remains default until end of session or execution of another USE statement with some other database. SQL USE DATABASE Statement: The Syntax for the USE Statement is: USE databasename; databasename - is the name of the database to be selected. Once the SQL Server is connected to a group, it only shows those databases which are common in all the member servers of that group. For example, if we have added 2 SQL Server in a Group Say SQL Server 1 & SQL Server 2. SQL Server 1 has DB1, DB2 & DB3 while SQL Server 2 has DB2, DB3 & DB4.
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The Web SQL Database API isn't actually part of the HTML5 specification but it is a separate specification which introduces a set of APIs to manipulate client-side databases using SQL.
I'm assuming you are a great web developer and if that is the case then no doubt, you would be well aware of SQL and RDBMS concepts. Mail pilot 3 0 (8365) b download free. If you still want to have a session with SQL then, you can go through our SQL Tutorial.
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Web SQL Database will work in latest version of Safari, Chrome and Opera.
The Core Methods
There are following three core methods defined in the spec that I am going to cover in this tutorial −
- openDatabase − This method creates the database object either using existing database or creating new one.
- transaction − This method gives us the ability to control a transaction and performing either commit or rollback based on the situation.
- executeSql − This method is used to execute actual SQL query.
Opening Database
The openDatabase method takes care of opening a database if it already exists, this method will create it if it already does not exist.
To create and open a database, use the following code −
The above method took the following five parameters −
- Database name
- Version number
- Text description
- Size of database
- Creation callback
The last and 5th argument, creation callback will be called if the database is being created. Without this feature, however, the databases are still being created on the fly and correctly versioned.
Cosmos Db Sql Query Syntax
Executing queries
To execute a query you use the database.transaction() function. This function needs a single argument, which is a function that takes care of actually executing the query as follows −
The above query will create a table called LOGS in 'mydb' database.
INSERT Operation
To create enteries into the table we add simple SQL query in the above example as follows −
We can pass dynamic values while creating entering as follows −
Here e_id and e_log are external variables, and executeSql maps each item in the array argument to the '?'s.
READ Operation
To read already existing records we use a callback to capture the results as follows −
Final Example
So finally, let us keep this example in a full-fledged HTML5 document as follows and try to run it with Safari browser.
Cosmos Db Sql Query Examples
This will produce the following result −