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Jessica Qiu

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Top Stories by Jessica Qiu

Recently, we skillfully handled an industry project to import a great amount of data from file to Oracle in comparatively short time. At the beginning, we tried to import the data with the sqlldr of Oracle, only to find it is surprisingly time-consuming to load a great amount of data: Too slow if 2.5 hours have to be spent to import a table containing 80 million records. Later, by adopting the parallel import of sqlldr, the time is shortened to 0.8 hour. Here are the full details: Train of thoughts Split the data file to import into 10 shares. Then, with the multi-task parallelism, execute the sqlldr command for the corresponding shares. Needless to say, prepare the control files of the same amount. Then, multiple clients will start to import data to database all at the same time. Please note these two things: 1. The way to generate multiple sqlldr commands and corr... (more)

Solving a JOIN Computation by SQL and esProc

Based on the generic data type, esProc provides the sequence and the Table Sequence for implementing the complete set-lizing and the much more convenient relational queries.   The relation between the department and the employee is one-to-many and that between the employee and the SSN (Social Security Number) is one-to-one. Everything is related to everything else in the world. The relational query is the access to relational dataset with the mathematical linguistics. Thanks to the associated query, the relational database (RDBMS) is extensively adopted. I Case and Comparison... (more)

Issue of Reporting Development in Different Databases

Recently a development team met some difficulties in data source computation when developing iReport reports. After the use of esProc for cross database computation, the problem is resolved. This is a project payment progress report, as part of a project management system. It's based on an Oracle database. The reports needs to present the project name, payment amount, contract value, payment progress (in percentage), and name of the project manager, etc., for all ongoing projects. Amount these the first 3 items contributes to the difficulties met by the development team. Note t... (more)

Excel Data Processing Example

It is convenient to read and write Excel files with esProc. We'll illustrate this through an example: Example description: Read data of orders and sellers' information list from data.xlsx, compute sales amount of every department according to the two sheets, and enter the result into result.xlsx. Original Excel File: data.xlsx contains two sheets. The data of orders is shown in the following figure:   Sellers' information list is as follows:   esProc code:   A1-A2:Read the first sheet, data of orders, and the second sheet, sellers' information list, respectively from the excel ... (more)

Cross Database Computing in Report Development

Recently a development team met some difficulties in data source computation when developing iReport reports. After the use of esProc for cross database computation, the problem is resolved. This is a project payment progress report, as part of a project management system. It's based on an Oracle database. The reports needs to present the project name, payment amount, contract value, payment progress (in percentage), and name of the project manager, etc., for all ongoing projects. Amount these the first 3 items contributes to the difficulties met by the development team. Note t... (more)