The JAR file "jsqlparser-0.7.0.jar" is not a regular Java library. It is a simple zipped file containing several artifacts: a source and a documentation directory, some testfiles, and - what you need - another JAR called "jsqlparser.jar" in a lib directory.
This JAR is the "real library" that you must add to your project. Additionally, all packages inside this library start with "net.sf.jsqlparser".