tests: UUID vs setString test

By default, setString sends 'varchar' datatype, and PostgreSQL might result in
<<ERROR: column "id" is of type uuid but expression is of type character varying>>

There's stringType option that enables sending strings as UNSPECIFIED type to overcome that error.

fixes #1133

pgjdbc/src/test/java/org/postgresql/test/jdbc2/BaseTest4.java

@@ -33,10 +33,15 @@ public enum AutoCommit {
     YES, NO
   }
 
+  public enum StringType {
+    UNSPECIFIED, VARCHAR;
+  }
+
   protected Connection con;
   private BinaryMode binaryMode;
   private ReWriteBatchedInserts reWriteBatchedInserts;
   protected PreferQueryMode preferQueryMode;
+  private StringType stringType;
 
   protected void updateProperties(Properties props) {
     if (binaryMode == BinaryMode.FORCE) {
@@ -45,6 +50,9 @@ protected void updateProperties(Properties props) {
     if (reWriteBatchedInserts == ReWriteBatchedInserts.YES) {
       PGProperty.REWRITE_BATCHED_INSERTS.set(props, true);
     }
+    if (stringType != null) {
+      PGProperty.STRING_TYPE.set(props, stringType.name().toLowerCase());
+    }
   }
 
   protected void forceBinary(Properties props) {
@@ -55,6 +63,14 @@ public final void setBinaryMode(BinaryMode binaryMode) {
     this.binaryMode = binaryMode;
   }
 
+  public StringType getStringType() {
+    return stringType;
+  }
+
+  public void setStringType(StringType stringType) {
+    this.stringType = stringType;
+  }
+
   public void setReWriteBatchedInserts(
       ReWriteBatchedInserts reWriteBatchedInserts) {
     this.reWriteBatchedInserts = reWriteBatchedInserts;

pgjdbc/src/test/java/org/postgresql/test/jdbc4/UUIDTest.java

@@ -9,19 +9,43 @@
 import static org.junit.Assert.assertTrue;
 
 import org.postgresql.core.ServerVersion;
+import org.postgresql.test.TestUtil;
 import org.postgresql.test.jdbc2.BaseTest4;
+import org.postgresql.util.PSQLState;
 
+import org.junit.Assert;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
 
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.sql.Types;
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.UUID;
 
+@RunWith(Parameterized.class)
 public class UUIDTest extends BaseTest4 {
 
+  public UUIDTest(BinaryMode binaryMode, StringType stringType) {
+    setBinaryMode(binaryMode);
+    setStringType(stringType);
+  }
+
+  @Parameterized.Parameters(name = "binary={0}, stringType={1}")
+  public static Iterable<Object[]> data() {
+    Collection<Object[]> ids = new ArrayList<Object[]>();
+    for (BinaryMode binaryMode : BinaryMode.values()) {
+      for (StringType stringType : StringType.values()) {
+        ids.add(new Object[]{binaryMode, stringType});
+      }
+    }
+    return ids;
+  }
+
   @Override
   public void setUp() throws Exception {
     super.setUp();
@@ -60,5 +84,30 @@ public void testUUID() throws SQLException {
     stmt.close();
   }
 
+  @Test
+  public void testUUIDString() throws SQLException {
+    String uuid = "0dcdf03a-058c-4fa3-b210-8385cb6810d5";
+    PreparedStatement ps = con.prepareStatement("INSERT INTO uuidtest VALUES (?)");
+    ps.setString(1, uuid);
+    try {
+      ps.executeUpdate();
+      if (getStringType() == StringType.VARCHAR) {
+        Assert.fail(
+            "setString(, uuid) should fail to insert value into UUID column when stringType=varchar."
+                + " Expecting error <<column \"id\" is of type uuid but expression is of type character varying>>");
+      }
+    } catch (SQLException e) {
+      if (getStringType() == StringType.VARCHAR
+          && PSQLState.DATATYPE_MISMATCH.getState().equals(e.getSQLState())) {
+        // The following error is expected in stringType=varchar mode
+        // ERROR: column "id" is of type uuid but expression is of type character varying
+        return;
+      }
+      throw e;
+    } finally {
+      TestUtil.closeQuietly(ps);
+    }
+  }
+
 }