Add some docs. Override config with command line parameters

Author: jdlopez

.gitignore

@@ -24,4 +24,7 @@ hs_err_pid*
 
 .idea
 *.iml
-target/
+target/
+.classpath
+.project
+.settings/

README.md

@@ -1,2 +1,30 @@
 # sqlcmd
-SQL command line executor using JDBC drivers. Usefull for cron jobs and some automation. Porting of my previous sf.net code
+SQL command line executor using JDBC drivers. Useful for cron jobs and some automation. Porting of my previous sf.net code
+
+Usage:
+
+    java -jar sqlcmd.jar -c:sqlcmd_config.properties <<EOF
+        SELECT *
+        FROM MY_TABLE
+    EOF
+
+Config values:
+
+* jdbcDriverPath=Path to jdbc driver jar (loaded dynamically)
+* jdbcDriverClass=Jdbc Driver class full name
+* jdbcUrl=Jdbc connection URL
+* jdbcUser=
+* jdbcPass=
+* inputSQL=Path to input sql file (not required/optional if not present it uses stdin)
+* outputResult=Path to output file (if not present uses stdout)
+* printHeader=true/false If true adds header with query's column name. Default true
+* printFieldSeparator=Field separator for printing. Default tab (\t)
+
+Config values can be set also with parameters:
+
+    -p:paran_name=param_value
+
+Ex:
+
+    -p:printHeader=false
+

pom.xml

@@ -55,7 +55,7 @@
     <distributionManagement>
         <repository>
             <id>github</id>
-            <name>GitHub OWNER Apache Maven Packages</name>
+            <name>GitHub jdlopez Apache Maven Packages</name>
             <url>https://maven.pkg.github.com/jdlopez/sqlcmd</url>
         </repository>
     </distributionManagement>

src/main/java/es/jdlopez/sqlcmd/MainRunner.java

@@ -90,19 +90,26 @@ private static String readAll(InputStream in) throws IOException {
 
     private static RunnerConfig readArgs(String[] args) throws ConfigException {
         RunnerConfig conf = null;
-        if (args != null)
-            for (String a: args) {
+        if (args != null) {
+            Properties p = new Properties();
+            for (String a : args) {
                 if (a.startsWith("-c:")) { // config
-                    Properties p = new Properties();
                     try {
                         p.load(new FileReader(a.substring("-c:".length())));
                     } catch (IOException e) {
                         throw new ConfigException("configFile", "Reading config file", e);
                     }
-                    conf = BeanReader.fromProperties(p, RunnerConfig.class);
-                } // else if ... for any other args TODO
+                } else if (a != null && a.startsWith("-p:")) {
+                    String s = a.substring("-p:".length());
+                    int idxEq = s != null? s.indexOf("="):-1;
+                    if (idxEq < 0)
+                        throw new ConfigException(s, "Param argument must be: -p:name=value");
+                    else
+                        p.setProperty(s.substring(0, idxEq), s.substring(idxEq + 1));
+                }
             }
-        else
+            conf = BeanReader.fromProperties(p, RunnerConfig.class);
+        } else
             throw new ConfigException(null, "No arguments");
         // default values (cant use constructor, explicit or implicit)
         if (conf.getPrintFieldSeparator() == null)