The fetchRow method returns data using the current fetch mode, but it returns only the first row fetched from the result set. The fetchOne method is like a combination of fetchRow with fetchCol , in that it returns data only for the first row fetched from the result set, and it returns only the value of the first column in that row.
Therefore it returns only a single scalar value, not an array or an object. You can use the Adapter class to write new data or change existing data in your database. This section describes methods to do these operations. You can add new rows to a table in your database using the insert method.
The first argument is a string that names the table, and the second argument is an associative array, mapping column names to data values. Columns you exclude from the array of data are not specified to the database. By default, the values in your data array are inserted using parameters.
This reduces risk of some types of security issues. You don't need to apply escaping or quoting to values in the data array. You might need values in the data array to be treated as SQL expressions, in which case they should not be quoted.
By default, all data values passed as strings are treated as string literals. The return value of the insert method is not the last inserted ID, because the table might not have an auto-incremented column. Instead, the return value is the number of rows affected usually 1. If your table is defined with an auto-incrementing primary key, you can call the lastInsertId method after the insert.
This method returns the last value generated in the scope of the current database connection. Some RDBMS brands support a sequence object, which generates unique values to serve as primary key values. To support sequences, the lastInsertId method accepts two optional string arguments. If the name of your sequence object does not follow this naming convention, use the lastSequenceId method instead. This method takes a single string argument, naming the sequence literally. Sometimes this query returns the most recent primary key value inserted into the table.
However, this technique is not safe to use in an environment where multiple clients are inserting records to the database.
It is possible, and therefore is bound to happen eventually, that another client inserts another row in the instant between the insert performed by your client application and your query for the MAX id value. Thus the value returned does not identify the row you inserted, it identifies the row inserted by some other client. There is no way to know when this has happened. Using a strong transaction isolation mode such as "repeatable read" can mitigate this risk, but some RDBMS brands don't support the transaction isolation required for this, or else your application may use a lower transaction isolation mode by design.
All RDBMS brands provide mechanisms to generate unique values, and to return the last value generated. These mechanisms necessarily work outside of the scope of transaction isolation, so there is no chance of two clients generating the same value, and there is no chance that the value generated by another client could be reported to your client's connection as the last value generated.
You can update rows in a database table using the update method of an Adapter. This method takes three arguments: the first is the name of the table; the second is an associative array mapping columns to change to new values to assign to these columns.
The values in the data array are treated as string literals. See this section for information on using SQL expressions in the data array. The third argument is a string containing an SQL expression that is used as criteria for the rows to change.
The values and identifiers in this argument are not quoted or escaped. You are responsible for ensuring that any dynamic content is interpolated into this string safely. See this section for methods to help you do this. The return value is the number of rows affected by the update operation. If you omit the third argument, then all rows in the database table are updated with the values specified in the data array.
If you provide an array of strings as the third argument, these strings are joined together as terms in an expression separated by AND operators. If you provide an array of arrays as the third argument, the values will be automatically quoted into the keys.
These will then be joined together as terms, separated by AND operators. You can delete rows from a database table using the delete method.
This method takes two arguments: the first is a string naming the table. The second argument is a string containing an SQL expression that is used as criteria for the rows to delete. The return value is the number of rows affected by the delete operation.
If you omit the second argument, the result is that all rows in the database table are deleted. If you provide an array of strings as the second argument, these strings are joined together as terms in an expression separated by AND operators. If you provide an array of arrays as the second argument, the values will be automatically quoted into the keys.
This is risky, because if the value in a PHP string contains certain symbols, such as the quote symbol, it could result in invalid SQL. For example, notice the imbalanced quote characters in the following query:. Even worse is the risk that such code mistakes might be exploited deliberately by a person who is trying to manipulate the function of your web application. If they can specify the value of a PHP variable through the use of an HTTP parameter or other mechanism, they might be able to make your SQL queries do things that you didn't intend them to do, such as return data to which the person should not have privilege to read.
The solution is to escape special characters such as quotes in PHP values before they are interpolated into your SQL strings. This protects against both accidental and deliberate manipulation of SQL strings by PHP variables that contain special characters.
The quote method accepts a single argument, a scalar string value. It returns the value with special characters escaped in a manner appropriate for the RDBMS you are using, and surrounded by string value delimiters. The standard SQL string value delimiter is the single-quote '. Note that the return value of quote includes the quote delimiters around the string. Values may need to be quoted or not quoted according to the SQL datatype context in which they are used.
For instance, in some RDBMS brands, an integer value must not be quoted as a string if it is compared to an integer-type column or expression. You can use the optional second argument to the quote method to apply quoting selectively for the SQL datatype you specify.
AvMishra AvMishra 1, 3 3 gold badges 14 14 silver badges 25 25 bronze badges. Username Username 13 3 3 bronze badges. Vladimir Ch Vladimir Ch 11 11 silver badges 24 24 bronze badges. Thanks vascowhite.
But i need to know the update mysql query format not a select query format. I don't think that SQL gets stored anywhere, it is generated and executed. Bill Karwin Bill Karwin k 82 82 gold badges silver badges bronze badges. Rajesh Patel Rajesh Patel 1, 14 14 silver badges 19 19 bronze badges. KevDev KevDev 49 4 4 bronze badges. To see the exact query run by mysql you can use the general query log.
The results are stored in the "mysql. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 12 years, 1 month ago. Active 8 years, 8 months ago. Viewed 15k times.
Juan Mellado EricP EricP 1, 6 6 gold badges 33 33 silver badges 54 54 bronze badges. Viewed times. Improve this question. Nagaraju Kasa. Nagaraju Kasa Nagaraju Kasa 5, 4 4 gold badges 42 42 silver badges 96 96 bronze badges. Yes Jinesh but can we use like Zend format. Add a comment. Active Oldest Votes. Improve this answer. Jinesh Jinesh 1 1 gold badge 2 2 silver badges 11 11 bronze badges.
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