package net.sf.jsqlparser.util.deparser;
import net.sf.jsqlparser.expression.Expression;
import net.sf.jsqlparser.expression.ExpressionVisitor;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.statement.update.Update;
/**
* A class to de-parse (that is, tranform from JSqlParser hierarchy into a string)
* an {@link net.sf.jsqlparser.statement.update.Update}
*/
public class UpdateDeParser {
protected StringBuffer buffer;
protected ExpressionVisitor expressionVisitor;
public UpdateDeParser() {
}
/**
* @param expressionVisitor a {@link ExpressionVisitor} to de-parse expressions. It has to share the same<br>
* StringBuffer (buffer parameter) as this object in order to work
* @param buffer the buffer that will be filled with the select
*/
public UpdateDeParser(ExpressionVisitor expressionVisitor, StringBuffer buffer) {
this.buffer = buffer;
this.expressionVisitor = expressionVisitor;
}
public StringBuffer getBuffer() {
return buffer;
}
public void setBuffer(StringBuffer buffer) {
this.buffer = buffer;
}
public void deParse(Update update) {
buffer.append("UPDATE " + update.getTable().getWholeTableName() + " SET ");
for (int i = 0; i < update.getColumns().size(); i++) {
Column column = (Column) update.getColumns().get(i);
buffer.append(column.getWholeColumnName() + "=");
Expression expression = (Expression) update.getExpressions().get(i);
expression.accept(expressionVisitor);
if (i < update.getColumns().size() - 1) {
buffer.append(", ");
}
}
if (update.getWhere() != null) {
buffer.append(" WHERE ");
update.getWhere().accept(expressionVisitor);
}
}
public ExpressionVisitor getExpressionVisitor() {
return expressionVisitor;
}
public void setExpressionVisitor(ExpressionVisitor visitor) {
expressionVisitor = visitor;
}
}